Team:Goettingen/NoteBook w12

From 2013.igem.org

23rd

Transformation of Promoter1rev/Promoter3rev + pSB1C3 , Colony PCR for Transformation of Promoter1rev/Promoter3rev + pSB1C3, Preparation of new Backup plates from yesterday’s ColonyPCRs/Inoculation...

Transformation of Promoter1rev/Promoter3rev + pSB1C3 

-          neg. control plates still negative

-          pSB1C3 w/o insert control: 3 big clones on 50 μl-plate, many clones on rest-plate (small, big, medium in size)

-          pSB1C3 + Promoter1rev: no clones on 50 μl-plate, 10 clones on rest-plate (small or medium size)

-          pSB1C3 + Promoter3rev: no clones on 50 μl-plate, 6 clones on rest-plate (small or medium size)

→ Colony PCR to test for positive clones

→ plates stored at 4 °C, big fridge

Colony PCR for Transformation of Promoter1rev/Promoter3rev + pSB1C3

-          as described previously (10.7.13)

-          1x RBSrev in pSB1C3 plasmid as additional control (plasmid prepped on 19.8.13, 211.6 ng/μl →  1:20 dilution →  ca. 10 ng/μl), orange tube, termed RBS

-          1x medium size clone from w/o insert control plate picked (purple tube, termed R)

-          10x clones of Promoter1rev + pSB1C3 transformation picked (termed C1 – C10), blue tubes

-          6x clones of Promoter3rev + pSB1C3 transformation picked (termed C1 – C6), pink tubes

-          preparation of mastermix for 20 reactions, primers: iGEM_38 (VF2) and iGEM_39 (VR)

-          preparation of master plate (LBCm) →  incubation over day at 37 °C

-          25 μl mastermix + 1 μl plasmid dilution or cells

-          PCR protocol: same as on  10.7.13

-          plates stored at 4 °C, big fridge

Preparation of new Backup plates from yesterday’s ColonyPCRs/Inoculation

-          I wasn’t sure anymore, if I inoculated DarRrev-Termrev C1 – C5, part 6.4 B C1 – C5 and part 6.4A C1 – C8 correctly in the labeled tubes →  streak-out of all clones for DarRrev-Termrev C1 – C5, part 6.4 B C1 – C5 and part 6.4A C1 – C8 on new LBCm plates

-          in case of DarRrev-Termrev and part 6.4 B, the remaining clones on the master plates (that were not inoculated yesterday), were streaked out as well on the new master plate

-          incubation over day at 37 °C, then storage at 4 °C, big fridge

MiniPlasmidPreparation of clones inoculated yesterday

-          samples: DarRrev-Termrev C1 – C5, part 6.4 B C1 – C5 and part 6.4A C1 – C8

-          with Nucleospin kit (Macherery-Nagel)

-          1st elution: 30 μl HPLC water (pre-warmed), incubation for 2 min at 50 °C

2nd elution: 22 μl HPLC water (pre-warmed), incubation for 2 min at 50 °C

-          NanoDrop concentration measurement:

Test Restriction Digest of DarRrev-Termrev C1 – C5 

-          10 μl in total: 1 μl EcoRI FD + 1 μl PstI FD + 1 μl 10x FD Green buffer + 4 μl dH2O + 3 μl plasmid mix (ca. 200 – 300 ng plasmid)

-          preparation of 6x Mastermix consisting of enzymes, buffer and water

-          preparation of 3 μl plasmid-water Mix (plasmids prepped today, see above)

DarRrev-Termrev C1 →  3 μl plasmid (88.6 ng/μl)

DarRrev-Termrev C2 →  2 μl plasmid (160.2 ng/μl) + 1 μl dH2O

DarRrev-Termrev C1 →  1 μl plasmid (229.7 ng/μl) + 2 μl dH2O

DarRrev-Termrev C1 →  3 μl plasmid (88.5 ng/μl)

DarRrev-Termrev C1 → 2μl plasmid (107.3 ng/μl) + 1 μl dH2O

-          addition of 7 μl Mastermix

-          incubation at 37 °C for 1 h

Gel run for Test RD of DarRrev-Termrev C1 – C5, plasmids from today’s MiniPrep and Colony PCR for Transformation of Promoter1rev/Promoter3rev + pSB1C3

-        3x 1%-agarose-1xTAE gel

-        addition of 5 μl 5xLD to 25 μl Colony PCR reaction and loading of 5 μl PCR reaction supplied with 5xLD (during loading, some sample Colony PCR Promoter3rev+pSB1C3 C4 was spilled over the well…)

-        loading of 1 μl uncut DarRrev-Termrev C1 – C5 plasmid + 1 μl 5x LD + 3 μl dH2O; loading of 5 μl RD reaction mix

-        loading of 1 μl uncut part 6.4 B C1 – C5 and part 6.4A C1 – C8 plasmid + 1 μl 5x LD + 3 μl dH2O

-        loading of 3 μl 2 log ladder as a marker

-        run at 100 V

-        EtBr staining + destaining in water

-        UV detection

 

Gel 1:

Loading: Marker/uncut DarRrev-Termrev C1/ RD DarRrev-Termrev C1/ uncut DarRrev-Termrev C2/ RD DarRrev-Termrev C2/ uncut DarRrev-Termrev C3/ RD DarRrev-Termrev C3/ uncut DarRrev-Termrev C4/ RD DarRrev-Termrev C4/ uncut DarRrev-Termrev C5/ RD DarRrev-Termrev C5/part 6.4 B C1 plasmid/part 6.4 B C2 plasmid/part 6.4 B C3 plasmid/part 6.4 B C4 plasmid/Marker

expected sizes for DarRrev-Termrev plasmids: 630 bp (DarRrev) + 130 bp (Terminatorrev) = 760 bp and 2070 bp from pSB1C3 backbone

→ all DarRrev-Termrev clones are positive →  sequencing of C2 and C3 by SeqLab (because these clones have highest plasmid concentration)

→ all purified part 6.4 B plasmids look normal except for plasmid part 6.4 B C1 and C3 →  sequencing of C2 and C5 by SeqLab (because these clones have highest plasmid concentration and because their plasmids seem to be ok)

 

Gel 2:

Loading: Marker/part 6.4 B C5 plasmid/ part 6.4A C1 plasmid/ part 6.4A C2 plasmid/ part 6.4A C3 plasmid/ part 6.4A C4 plasmid/ part 6.4A C5 plasmid/ part 6.4A C6 plasmid/ part 6.4A C7 plasmid/ part 6.4A C8 plasmid/Colony PCR RBSrev+pSB1C3 plasmid/ Colony PCR Re-ligand/Colony PCR Promoter1rev+pSB1C3 C1/ Colony PCR Promoter1rev+pSB1C3 C2/ Colony PCR Promoter1rev+pSB1C3 C3/Marker

expected sizes for Promoter1rev and Promoter3rev Colony PCR products: 310 bp (VR, VF2) + 112 bp Promoter1/3rev = 422 bp

expected sizes for RBSrev+pSB1C3 and Re-ligand: 310 bp (VR, VF2) + 12 bp (RBSrev) = 322 bp  

→  all purified part 6.4 B/A plasmids look normal →  sequencing of part 6.4 A C2, C3, C5 and C8 by SeqLab (because these clones have highest plasmid concentration)

→  Colony PCR: for RBSrev+pSB1C3 and Re-ligand, the expected band was observed, band at same bp for Promoter1rev+pSB1C3 C1 – C3 (negative clones)

 

Gel3:

Loading: Marker/ Colony PCR RBSrev+pSB1C3 plasmid/ Colony PCR Promoter1rev+pSB1C3 C4/ Colony PCR Promoter1rev+pSB1C3 C5/ Colony PCR Promoter1rev+pSB1C3 C6/ Colony PCR Promoter1rev+pSB1C3 C7/ Colony PCR Promoter1rev+pSB1C3 C8/ Colony PCR Promoter1rev+pSB1C3 C9/ Colony PCR Promoter1rev+pSB1C3 C10/ Colony PCR Promoter3rev+pSB1C3 C1/ Colony PCR Promoter3rev+pSB1C3 C2/ Colony PCR Promoter3rev+pSB1C3 C3/ Colony PCR Promoter3rev+pSB1C3 C4/ Colony PCR Promoter3rev+pSB1C3 C5/ Colony PCR Promoter3rev+pSB1C3 C6/Marker

expected sizes for Promoter1rev and Promoter3rev Colony PCR products: 310 bp (VR, VF2) + 112 bp Promoter1/3rev = 422 bp

expected sizes for RBSrev+pSB1C3 and Re-ligand: 310 bp (VR, VF2) + 12 bp (RBSrev) = 322 bp

 Colony PCR: for RBSrev+pSB1C3, the expected band was observed, band at same bp for Promoter1rev+pSB1C3 C5 and for Promoter3rev+pSB1C3 C1 – C4 and C6 (negative clones); band at ca. 400 bp for romoter1rev+pSB1C3 C4 and Promoter3rev+pSB1C3 C5 (= positive clones)→  on Monday: inoculation of these clones for MiniPrep, test RD and sequencing

Preparations of samples for sequencing by SeqLab

9 – DarRrev-Termrev C2 + VF2

10 – DarRrev-Termrev C2 + VR

11 – DarRrev-Termrev C3 + VF2

12  - DarRrev-Termrev C3 + VR

13 – part6.4 B C2 + VF2

14 – part 6.4 B C5 + VF2

15 – part 6.4 A C2 + VF2

16 – part 6.4 A C3 + VF2

17- part 6.4 A C5 + VF2

18 – part 6.4 A C8 + VF2

 

-          for all samples: 6 μl plasmid + 1 μl iGEM_38 1:5 or iGEM_39 1:5

Cryostocks and Minipreps of Ribo A C4 and C5 inocculated by Nina yesterday

Following clones were frozen away prepped: 

Samples

Procedures done

C4 3

Cryostock and Mini

C4 4

Cryostock and Mini

C4 6

Cryostock and Mini

C4 7

Cryostock

C4 8

Cryostock and Mini

C5 2

Cryostock and Mini

C5 3

Cryostock and Mini

C5 6

Cryostock and Mini

C5 8

Cryostock and Mini

-     C4 7 was dropped during the miniprep

 

Nanodrop:

All ca. 400-500ng/µl , good ratio, exact measurements on the vials

 

Sequencing by SeqLab:

1: Ribo A C4 6 VF

2: Ribo A C4 6 VR

3: Ribo A C4 8 VF

4: Ribo A C4 8 VR

5: Ribo A C5 6 VF

6: Ribo A C5 6 VR

7: Ribo A C5 8 VF

8: Ribo A C5 8 VR

Inoculation of 10ml cultures of Ribo A C4 7 and 8, the DAC cells and an empty vector as control (names to be added later) for an experiment with plates containing either the reporter system or the DAC producing cells in the agar. Clones were inoculated by Katrin G. yesterday.

Our Ribo A clones didn´t grow at all, the other two cultures were harvested at OD600=2, washed and frozen away at -80°C in Glycerin as follows:

→ harvest 4x 2ml of the culture in 2ml eppis

→ centrifuge down

→ discard supernatant

→ resuspend cells in 100µl LB medium

→ transfer the resuspended cells into a 2ml screw-cap-eppi

→ add 200µl Glycerin

→ Vortex and freeze at -80°C


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SDS Page of dialysis and elution samples

SDS Page of dialysis and elution samples

-       Mix 15µl of samples  with 5µl Pab and 5µl buffer W

-       Incubation for 10min at 93°C

-       Mix each sample with 4µl protein marker

-       Load whole volume on 15% SDS-gel

-       Run for 5min at 90V and 1h at 120V

 

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22nd

Colony PCR for DarRrev-Termrev transformation , Colony PCR for part6.3 B + RBSrev transformation, Gel run for Colony PCR for DarRrev-Termrev transformation, Sequencing of part6.3 B C1, C2 and C3 plasmids by G2L, Plates of part6.3 A + RBSrev transformation...

Transformation from 21.8.13

-          neg. control: no clones on 50 μl-plate, no clones on rest-plate

-          Termrev vector w/o insert: no clones on 50 μl-plate, few clones on rest-plate

-          Termrev vector + DarRrev insert: few clones on 50 μl-plate, many clones on rest-plate

-          part 6.3 A vector w/o insert: no clones on 50 μl-plate, 1 clone on rest-plate

-          part 6.3 A vector + RBSrev insert: no clones on 50 μl-plate, few clones on rest-plate

-          part 6.3 B vector w/o insert: no clones on 50 μl-plate, no clones on rest-plate

-          part 6.3 B vector + RBSrev insert: no clones on 50 μl-plate, some clones on rest-plate

-          pSB1C3 vector w/o insert: 1 or 2 clones on 50 μl-plate, several clones on rest-plate

-          pSB1C3 vector + Promoter1rev insert: no clones on 50 μl-plate, no clones on rest-plate

-          pSB1C3 vector + Promoter3rev insert: no clones on 50 μl-plate, few clones on rest-plate

→ colony PCR for DarRrev-Termrev transformation

→ further incubation of all other plates, until clones are bigger/grown

Colony PCR for DarRrev-Termrev transformation 

-          as described previously (10.7.13)

-          1x Termrev C1 plasmid as additional control (plasmid prepped on 16.8.13, 102.8 ng/μl →  1:10 dilution →  ca. 10 ng/μl), blue tube (termed T)

-          1x Re-ligand (termed R), pink tube

-          12x DarRrev-Termrev clones (termed C1 – C12), purple tubes

-          preparation of mastermix for 15 reactions, primers: iGEM_38 (VF2) and iGEM_39 (VR)

-          preparation of master plate (LBCm) →  incubation over day at 37 °C

-          25 μl mastermix + 1 μl plasmid dilution or cells

-          PCR protocol: same as on  10.7.13

-          plates stored at 4 °C, big fridge

Plates for part 1 – 4 C1 – C3 

-          plates taken out, since all clones grew

-          plates put to 4 °C, big fridge

Colony PCR for part6.3 B + RBSrev transformation 

-          after some additional incubation time

-          as described previously (10.7.13)

-          1x part6.3 B C2 plasmid as additional control (plasmid prepped on 19.8.13, 220.3 ng/μl →  1:20 dilution →  ca. 11 ng/μl), purple tube, termed 6.3 B

-          neg. control plates still without colonies

-          still no religands →  performing dephosphorylation longer than actually necessary seems to be helpful (see 20.8.13)

-          1 or 2 clones on 50 μl plate, many clones on rest-plate: 13x clones picked (termed C1 – C13), green tubes

-          preparation of mastermix for 15 reactions, primers: iGEM_38 (VF2) and iGEM_39 (VR)

-          preparation of master plate (LBCm) →  incubation over day at 37 °C

-          25 μl mastermix + 1 μl plasmid dilution or cells

-          PCR protocol: same as on  10.7.13

-          plates stored at 4 °C, big fridge

→ 12 bp (size of RBSrev) difference between positive and negative clones, one would never see in a gel… PCR thrown away…

Gel run for Colony PCR for DarRrev-Termrev transformation

-          1%-agarose-1xTAE gel

-          addition of 5 μl 5xLD to 25 μl PCR reaction

-          loading of 3 μl 2 log ladder as a marker

-          loading of 5 μl PCR reaction supplied with 5xLD

-          run at 100 V

-          EtBr staining + destaining in water

-          UV detection

 

Loading: Marker/Termrev plasmid/Re-ligand/ DarRrev-Termrev C1/ DarRrev-Termrev C2/ DarRrev-Termrev C3/ DarRrev-Termrev C4/ DarRrev-Termrev C5/ DarRrev-Termrev C6/ DarRrev-Termrev C7/ DarRrev-Termrev C8/ DarRrev-Termrev C9/ DarRrev-Termrev C10/ DarRrev-Termrev C11/ DarRrev-Termrev C12/Marker

-          expected product sizes

negative clone: 310 bp (VR, VF2) + 130 bp (Terminatorrev) = 440 bp

positive clone: 310 bp (VR, VF2) + 130 bp (Terminatorrev) + 630 bp (DarRrev) = 1070 bp

→ Religand plasmid corresponds to Termrev plasmid, as expected

→ all DarRrev-Termrev clones appear to be positive →  inoculate 3 clones for MiniPrep tomorrow

-          PCR reactions stored at 4 °C, small fridge

Sequencing of part6.3 B C1, C2 and C3 plasmids by G2L

sequencing by SeqLab failed; for both clones, sequence stopped at same region: possible reason: secondary structures formed during sequencing

5 μl total reaction: ca. 300 ng plasmid + 10 % DMSO (to prevent secondary structures) + 1 μl primer iGEM_38, 1:20 diluted

 

Preparation of the following samples

-          ppra_1: 2 μl plasmid prepped on 19.8.13 (268.4 ng/μl) + 1 μl DMSO (50 % in HPLC water) + 1 μl iGEM_38 1:20 + 1 μl HPLC water

-          ppra_2: 2 μl plasmid prepped on 19.8.13 (220.3 ng/μl) + 1 μl DMSO (50 % in HPLC water) + 1 μl iGEM_38 1:20 + 1 μl HPLC water

-          ppra_3: 2 μl plasmid prepped on 19.8.13 (247.2 ng/μl) + 1 μl DMSO (50 % in HPLC water) + 1 μl iGEM_38 1:20 + 1 μl HPLC water

-          ppra_4: 1 μl plasmid prepped on 21.8.13 (305.4 ng/μl) + 1 μl DMSO (50 % in HPLC water) + 1 μl iGEM_38 1:20 + 2 μl HPLC water

-          ppra_5: 1 μl plasmid prepped on 21.8.13 (332.1 ng/μl) + 1 μl DMSO (50 % in HPLC water) + 1 μl iGEM_38 1:20 + 2 μl HPLC water

-          ppra_6: 1 μl plasmid prepped on 21.8.13 (328.8 ng/μl) + 1 μl DMSO (50 % in HPLC water) + 1 μl iGEM_38 1:20 + 2 μl HPLC water

prior to sequencing, the samples have to be denatured →  remark was entered into excel-sheet

Plates of part6.3 A + RBSrev transformation

-          still no clones on neg. control

-          3 clones on w/o insert plate

-          8 clones on w/ insert plate

Inoculation of DarRrev-Termrev clones, part6.3 B + RBSrev(= part 6.4 B) and part 6.3 A + RBSrev(= part 6.4 A) clones for MiniPrep

-          inoculation of

DarRrev-Termrev clones C1 – C5→  Test restriction digest

 B clones C1 – C5 (no re-ligands)→  sequencing

part6.4 A clones C1 – C8 (3 re-ligands and 8 clones on WITH-insert plate→  sequencing

-          in 4 ml LBCm

-          incubation at 37 °C ON

Run the colony PCR from yesterday on a gel

Gel doc:

Wells: M/Ribo A C4 clone 1/2/3/4/5/6/7/8/9/10/blank/religant from control plate w/o insert

Wells: M/Ribo A C5 clone 1/2/3/4/5/6/7/8/9/10/blank/religant from control plate w/o insert

→ all clones with the high band should contain the Ribo A insert

 

Following clones were choosen to prepare a miniprep:

Ribo A C4 clones 3/4/6/7/8 (all others didn’t grew or showed wrong bands)

Ribo A C5 clones 2/3/6/8 (all others didn’t grew or showed wrong bands)

 

Miniprep of the DAC team Lm cryostock colony

Nanodrop:

Sample

ng/µl

A260nm/A280nm

A260nm/A230nm

C4 3

15.8

0.82

0.18

C4 4

105.8

1.92

0.89

C4 6

46.8

1.44

0.41

C4 7

223.6

1.69

0.93

C4 8

85.2

1.53

0.73

C5 2

23.3

1.74

2.27

C5 3

56.0

1.97

0.87

C5 6

154.9

1.56

0.71

C5 8

-0.1

-0.06

-0.05

DAC Lm

36.5

1.75

1.91

Second elute C5 2

17.5

1.46

0.65

Second elute DAC Lm

51.1

1.83

2.41

Second measurement C5 8

3.2

1.37

0.37

Stored in to do box

 

Following plasmids were choosen for sequencing:

Seq number

Plasmid + primer

1

C4 clone 7 for

2

C4 clone 7 rev

3

C4 clone 6 for

4

C4 clone 6 rev

5

C5 clone 3 for

6

C5 clone 3 rev

7

C5 clone 6 for

8

C5 clone 6 rev

 

Again inocculation of all preped Ribo A C4 and C5 clones that were already prepped, for preparation of Cryostocks and a new miniprep, as the old one showed smears

 

Katrin Gunka

Preparation of plates with Lb medium also containing the DAC team Lm stain. One plate just like this, another one also containing

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RT-PCR

RT-PCR

·         Another gel to check the digestion from the day before and to check the newly ordered primers for ydaO and ktrA.

·         The gel looked fine, so the RT-PCR can get started

Concentrations digested RNA

·         digestion 20.08.13

o   wt: 76 ng/µl

o   44: 73 ng/µl

o   46: 83 ng/µl

o   wt*: 87 ng/µl

o   44*: 73 ng/µl

o   46*: 69 ng/µl

·         digestion 21.08.13

o   wt: 63 ng/µl

o   44: 64,5 ng/µl

o   46: 72 ng/µl

Macintosh HD:Users:jangundlach:Desktop:130821_progress:Folie6.jpg

Results RT-PCR

Macintosh HD:Users:jangundlach:Dropbox:Sam, Jan:LabBook:Bilder LabbBook 1:130903_ Ergebnisse Zusammenfassung:Folie1.jpg

Macintosh HD:Users:jangundlach:Dropbox:Sam, Jan:LabBook:Bilder LabbBook 1:130903_ Ergebnisse Zusammenfassung:Folie2.jpg

·         no significant differences. All genes seem to be downregulated in both strains (1344 = much c-di-AM; 1346 = little c-di-AMP)

Ø  for better differences a new RT-PCR with differrent conditions are tested (medium: low and high phosphate medium)

These results show us, that there is no real difference between the strains, because all genes are downregulated.ptsH, hrcA and groEL, served as control. We are mainly interested in ydaO and ktrA. YdaO is the gene behind the riboswitch, ktrA is a phosphate channel. Due to the fact that there is no difference between 1344 and 1346 compared to the wildtype in CSE 0,5% Glucose medium, we did the exact same setup only in low & high phosphate medium (see below).

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21st

Plasmid Mini Prep, Transformation of ligations prepared yesterday, observation of clones of Ribo A C4 and C5 CFP under UV light...

CryoStocks 

-          preparation of DMSO cryostocks of all inoculated clones (according to protocol described previously)

Plasmid Mini Prep

-          MiniPrep was done using the culture volume that remained after preparing the cryostocks (see above)

-          kit: Nucleospin, Macherey-Nagel

-          cells were harvested by centrifuging at 13000 g, 1 min

-          elution: 1x 30 μl HPLC water (pre-warmed), incubation for 3 min at 50 °C

-          NanoDrop concentration measurement:

Transformation of ligations prepared yesterday

-          according to protocol in methods folder

-          with XL1-Blue comp. cells

-          neg. control was done

-          when adding the Promoter1rev + pSB1C3 ligation mix to the comp. cells, a drop of the comp. cells was spilled…

-          500 μl were removed after centrifuging

-          plating on LBCm plates

-          incubation at 37 °C

Gel run after MiniPrep to check if plasmids are clean

-          1 %-agarose-1xTAE gel from yesterday (prepared by Jan)

-          loading of 3 μl 2 log ladder

-          loading of 1 μl plasmid + 1 μl 5xLD + 3 μl dH2O

-          run at 100 V

-          EtBr staining + destaining in water

-          UV detection

loading: Marker/Termrev C1/DarRrev C4/ RBSrev C1/part6.3 A C1/part6.3 B C1/ part6.3 B C2/ part6.3 B C3

→ all plasmids are purified from chrom.DNA and look normal

→ samples stored in DarR reporter system boxRe-streak of part 1 – 4 Clones 1 – 3 on LBAmp 

-          plates from 6.6.13 (stored in fridge…. at 4 °C….)

-          bacteria were quite dry, so I scratched some cell material off and streaked it out on new plates

-          incubation ON at 37 °C

-          let’s hope they grow…

Preparation of new LBCm plates 

-          2x500 ml

-          35 μg/ml Cm

-          stored at 4 °C, big fridge

observation of clones of Ribo A C4 and C5 CFP under UV light

(all clones with YFP don’t glow under UV light) 

Pictures:

Ribo A C4 + CFP UV light

Ribo A C4 + CFP transmitted light

Ribo A C5 + CFP UV light

Ribo A C5 + CFP transmiited light

Control w/o insert UV light

Control w/o insert transmitted light

Preparation of a Masterplate of 10 clones from plate with C4 and C5 CFP

Inocculation of 10 clones from plate with C4 and C5 CFP in LB medium with Cm

Colony PCR of the inoculated clones and a control w/o insert CFP

Component

Volume

Taq

1μl

10x Taq buffer

2,8μl

dNTP mix

1μl

iGEM_38 (VF2) 1:20

1μl

iGEM_39 (VR) 1:20

1μl

dH2O

18,8μl

Total

25μl

 

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DNAse I digestion

DNAse I digestion

·         this digestion is necessary to get rid of DNA contamination

·         use PCR tubes

25 µl sample

·         2.5 µg RNA

·         2.5 µl 10 x buffer

·         5 µl DNAse I

·         x µl RNAse free water

30 min 37°C in the PCR cycler

Stop the reaction with 2.5 µl EDTA for 10 min at 65°C (also in the cycler)

Control PCR on digestion

PCR Scheme (50 µl)

·         10 µl HF buffer

·         2 µl dNTPs Mix

·         4 µl Primer Mix (here rpsE)

·         1 µl RNA

·         0,5 µl PhuS

·         32 µl RNAse free H20.

PCR Programm

·         98°C 2 min

·         98°C 35 sec

·         52°C 35 sec

·         72°C 45 sec

·         72°C 10 min

·         15°C hold

 

·         run a gel to check if everything went correctly

In this case we did this digestion with the wt, GP1344 and GP1346. Additionally we used a NTC and cDNA control.

Macintosh HD:Users:jangundlach:Dropbox:Sam, Jan:LabBook:Bilder LabbBook 1:130820_DNAse I digestion control PCR:Folie1.jpg

Ø  The digestion worked fine. No DNA detectable in our samples, only in the cDNA

Ø  Determine RNA concentration

Ø  This failed

We did the digestion again. This time we used 6 samples in total, two samples of each strain. IN the first three samples we used 5 µl DNAse I according to protocol, in the other three samples we only used 2.5 µl DNAse I.

Stored the samples over night at -20°C.

 

Fold ↑
20th

Gel extraction of DarRrev insert , Restriction digest of Termrev with PstI FD, Restriction digest of RBSrev C1 and part6.3 A and B (C2 each) with EcoRI FD, AP treatment of Termrev vector for ligation with DarRrev insert , Restriction Digest of all vectors digested with EcoRI FD today, ligation.....

Transformation of yesterday´s ligation

Gel extraction of DarRrev insert 

-          with Qiagen PCR gel/PCR purification kit

-          since DarRrev insert has > 600 bp, no isopropanol was added/only QG buffer used

-          only 1 column used since <400 mg gel

-          elution 1x with 30 μl of pre-heated HPLC water, incubation at 50 °C for 2 min

-          NanoDrop concentration measurement

sample

ng/μl

A260nm/A280nm

A260nm/A230nm

DarRrev insert X+P

14.8

1.53

0.12

Restriction digest of Termrev with PstI FD

-          DNA: Termrev C1 plasmid restricted with SpeI and purified yesterday

-          digest: 

Component

Volume

plasmid

30μl (volume determined with pipet)

10x FD Green buffer

4μl

PstI FD

4μl

dH2O

2μl

Total

40μl

 

-          digest for 2 h at 37 °C

Restriction digest of RBSrev C1 and part6.3 A and B (C2 each) with EcoRI FD

-          DNA: plasmids purified yesterday

-          digest for all reactions (pipette individually, no mastermix):

Component

Volume

plasmid

8μl (since each plasmid had > 200 ng/μl)

10x FD Green buffer

4μl

Eco

I FD

4μl

dH2O

24μl

Total

40μ

 -          digest for 2 h at 37 °C

Sequencing

 results RBSrev C1 and part6.3 A and B (C1 and C2 each)

-          part 6.3 A C1 (sample 3) – sequence as expected (no mutations)

-          part 6.3 A C2 (sample 4) – a G at position 52 of Hybridization oligo is missing →  digest sample (see above) thrown away, new digest (exactly as described above) using clone 1

-          part 6.3 B C1 (sample 5) – sequencing did not work, only first part of oligo in vector sequenced →  was ok

-          part 6.3 B C2 (sample 6) – sequencing did not work, only first part of oligo in vector sequenced →  was ok →  further digest

-          RBSrev in pSB1C3 C1 (sample 7) – sequence as expected

Loading: 

Marker/uncut Termrev C1/RD Termrev C1/uncut RBSrev C1/RD RBSrev C1/uncut part6.3 A C1/RD part6.3 A C1/uncut part6.3 B C2/RD part6.3 B C2/Marker

-          all digests are only partial, but most of plasmid is cut  →  purify digests

New sizes of Riboswitch PCR products

 

I checked again the alignments of the riboswitch PCR products, and the sizes I entered into the journal on 24.6.13 are partially wrong.

 

The correct sizes are: 

 

Primers

approx. PCR product size (w/o prefix/suffix)

approx. PCR product size (w/ prefix/suffix)

Riboswitch with native Promoter and RBS

iGEM_42

iGEM_43

460 bp

500 bp

Riboswitch with native Promoter

iGEM_42

iGEM_41

315 bp

355 bp

Riboswitch only

iGEM_40

iGEM_41

230 bp

270 bp

Riboswitch with native RBS

iGEM_40

iGEM_43

375 bp

415 bp

 

Inoculation of clones for CryoStocks

inoculation of

-          RBSrev + pSB1C3 C1

-          part 6.3 A C1

-          part 6.3 B C1, C2, C3

-          Termrev + pSB1C3 C1

-          DarRrev + pSB1C3 C4

 → from master plates, inoculation in 4 ml LBCm

incubation ON at 37 °C, 200 – 210 rpm

Purification of vectors digested today 

-          samples: RBSrev + pSB1C3 RD, part 6.3 A C1 and part 6.3 B C2 RD, Termrev + pSB1C3 RD

-          with Qiagen PCR clean-up kit

-          addition of 500 μl PB buffer to each reaction

-          elution with 30 μl pre-warmend HPLC water, incubation at 50 °C for 2 min

AP treatment of Termrev vector for ligation with DarRrev insert 

-          this is silly… I could have done it before purification, then I would have lost less vector…

-          addition of 1 μl AP, 4 μl AP buffer 10x, 8 μl dH2O to 27 μl purified vector

-          incubation for 1 h at 37 °C (PstI makes 3’ overhang)

Restriction Digest of all vectors digested with EcoRI FD today

-          samples: RBSrev + pSB1C3 RD, part 6.3 A C1 and part 6.3 B C2 RD

-          all samples had a volume of 30 μl after clean-up, so addition of 2 μl dH2O and 4 μl 10x FD buffer

-          addition of 4 μl SpeI FD to RBSrev + pSB1C3 RD sample, and 4μl XbaI FD to part 6.3 A C1 and part 6.3 B C2 RD samples

-          for all reactions: total volume of 40 μl

-          part 6.3 A C1 and part 6.3 B C2 RD digests incubated at 37 °C for 1 h (then dephosphorylation)

-          RBSrev + pSB1C3 RD digest incubated at 37 °C for 2 h (no dephosphorylation, since Promoter hybridization oligos are dephosphorylated!)

AP treatment of part 6.3 A C1 and B C2

-          40 μl reaction + 5 μl 10x AP buffer + 2 μl AP + 3 μl dH2O

-          incubation for ca. 50 min at 37 °C (although only 15 min needed, since XbaI and EcoRI generate 5’ overhangs. But dephosphorylation often incomplete…)

Gel run of digested and AP treated part 6.3 A C1 and BC2 and RBSrev digested with SpeI and EcoRI

-          1%-agarose-1xTAE gel

-          loading of 3 μl  2 log ladder

-          loading of 4 μl of dephosphorylated reactions + 1 μl 5xLD

-          loading of 3 μl RBSrev digest + 1 μl dH2O + 1μl 5xLD

-          run at 100 V

-          EtBr staining + destaining in water

-          UV detection

 

Loading:

Marker/ uncut RBSrev C1/RD RBSrev C1/uncut part6.3 A C1/RD + AP part6.3 A C1/uncut part6.3 B C2/RD + AP part6.3 B C2/Marker

-          no over-digest; digests still incomplete, but since AP treatment of at least part 6.3 A and B vector, this should not matter; in case of RBSrev ligation, re-ligands could occur

Purification of digested and dephosphorylated samples

-          with Qiagen PCR purification kit

-          addition of 500 μl PB buffer to each sample

-          elution 1x with 30 μl HPLC water (pre-warmed), incubation for 2 min at 50 °C

-          NanoDrop concentration measurement

 

Ligation

Ligation of

a) DarRrev insert + Termrev vector →  Termrev-DarRrev in pSB1C3

b) RBSrev hybridization oligo + part6.3 A/part 6.3 B →  part 6.4 A/part 6.4 B (RBSrev-Promoter1/3rev in part 6.2)

c) Promoter1/3rev + pSB1C3 derived from RBSrev in pSB1C3 digest →  Promoter1/3rev in pSB1C3

 

Pipetting scheme

a) DarRrev insert + Termrev vector →  Termrev-DarRrev in pSB1C3

Uni D’dorf ligation calculator: for a ratio vector:insert = 1:3, one has to use 50 ng of a 2200 bp (= 2070 of pSB1C3 + 130 bp of terminator) vector and 44 ng insert of 650 bp →  approximate amounts used in this ligation.

Component

With DarRrev insert

Without insert control

Termrev vector (purified today, 19.9 ng/µl)

3 µl

3 µl

DarRrev insert (purified today, 14.8 ng/µl) or dH2O for w/o insert control

3 µl

3 µl

T4 ligase (ThermoScientific)

1 µl

1 µl

10x T4 ligase buffer (ThermoScientific)

1 µl

1 µl

dH2O

2 µl

2 µl

Total

10 µl

10 µl

 

b) RBSrev hybridization oligo + part6.3 A/part 6.3 B →  part 6.4 A/part 6.4 B (RBSrev-Promoter1/3rev in part 6.2)

Component

With RBSrev insert

Without insert control

Part 6.3 A vector (purified today, 30.5 ng/µl)

2 µl

2 µl

RBSrev hybridization oligo (prepared on 19.8.13) or dH2O for w/o insert control

8 µl

8 µl

T4 ligase (ThermoScientific)

2 µl

2 µl

10x T4 ligase buffer (ThermoScientific)

2 µl

2 µl

dH2O

6 µl

6 µl

Total

20 µl

20 µl

 

Component

With RBSrev insert

Without insert control

Part 6.3 B vector (purified today, 33.6 ng/µl)

2 µl

2 µl

RBSrev hybridization oligo (prepared on 19.8.13) or dH2O for w/o insert control

8 µl

8 µl

T4 ligase (ThermoScientific)

2 µl

2 µl

10x T4 ligase buffer (ThermoScientific)

2 µl

2 µl

dH2O

6 µl

6 µl

Total

20 µl

20 µl

 

c) Promoter1/3rev + pSB1C3 derived from RBSrev in pSB1C3 digest →  Promoter1/3rev in pSB1C3

Component

With Promoter1rev insert

With Promoter3rev insert

Without insert control

psB1C3 vector (derived from RBSrev C1 plasmid, purified today, 29.9 ng/µl)

2 µl

2 µl

2 µl

Promoter1/3rev hybridization oligo (prepared on 19.8.13) or dH2O for w/o insert control

10 µl

10 µl

10 µl

T4 ligase (ThermoScientific)

2 µl

2 µl

2 µl

10x T4 ligase buffer (ThermoScientific)

2 µl

2 µl

2 µl

dH2O

4 µl

4 µl

4 µl

Total

20 µl

20 µl

20 µl

 

-          All reaction were pipetted individually/no mastermix

-          Incubation ON at 16 °C (cold room heat block)

Fold ↑

DNAse I digestion

DNAse I digestion

·         this digestion is necessary to get rid of DNA contamination

·         use PCR tubes

25 µl sample

·         2.5 µg RNA

·         2.5 µl 10 x buffer

·         5 µl DNAse I

·         x µl RNAse free water

30 min 37°C in the PCR cycler

Stop the reaction with 2.5 µl EDTA for 10 min at 65°C (also in the cycler)

Control PCR on digestion

PCR Scheme (50 µl)

·         10 µl HF buffer

·         2 µl dNTPs Mix

·         4 µl Primer Mix (here rpsE)

·         1 µl RNA

·         0,5 µl PhuS

·         32 µl RNAse free H20.

PCR Programm

·         98°C 2 min

·         98°C 35 sec

·         52°C 35 sec

·         72°C 45 sec

·         72°C 10 min

·         15°C hold

 

·         run a gel to check if everything went correctly

In this case we did this digestion with the wt, GP1344 and GP1346. Additionally we used a NTC and cDNA control.

Macintosh HD:Users:jangundlach:Dropbox:Sam, Jan:LabBook:Bilder LabbBook 1:130820_DNAse I digestion control PCR:Folie1.jpg

Ø  The digestion worked fine. No DNA detectable in our samples, only in the cDNA

Ø  Determine RNA concentration

Ø  This failed

We did the digestion again. This time we used 6 samples in total, two samples of each strain. IN the first three samples we used 5 µl DNAse I according to protocol, in the other three samples we only used 2.5 µl DNAse I.

Stored the samples over night at -20°C.

 

Fold ↑
19th

Mini-Preps of RiboA Clones 1, 2, 4 and 5 (see gel from 12.08.), RD of Ribo 2,4,5, Ligations of the Riboswitches into next vectors, MiniPrep of RBSrev + pSB1C3, Prom1rev + part6.2, Prom3rev + part 6.2 (C1 – C3 each) and PCR test, PCR to test, if RBSrev C1 – C3 are positive or negative, Test restriction digest of Prom1rev + part6.2, Prom3rev + part 6.2 (C1 – C3 each)....

Cloning of Riboswitch A

Mini-Preps of RiboA Clones 1, 2, 4 and 5 (see gel from 12.08.) using the plasmid purification kit

Nanodrop measurements:

Sample

ng/µl

A260nm/A280nm

A260nm/A230nm

Ribo A clone 1

213.9

1.89

1.86

Ribo A clone 2

152.5

1.95

2.00

Ribo A clone 4

396.6

1.90

2.11

Ribo A clone 5

429.4

1.89

2.18

 

Restriction Digestion of

Ribo A clones 4 +5, (R.D. with E + S)

Ribo B clone 2, (R.D. with X + P)

Ribo C clone 4, (R.D. with E + S)

Ribo D clone 5 (R.D. with X + P)

 

1500 ng DNA

3µl enzyme FD

3µl enzyme FD

4µl Buffer FD

40 µl reaction (filled up with H2O)

for 1.5 h at 37°C

 

Gel:

M/plasmid DNA Ribo A clone 4/ R.D. Ribo A clone 4/ plasmid DNA Ribo A clone 5/ R.D. Ribo A clone 5/ plasmid DNA Ribo B clone 2/ R.D. Ribo B clone 2/ plasmid DNA Ribo C clone 4/ R.D. Ribo C clone 4/ plasmid DNA Ribo D clone 5/ R.D. Ribo D clone 5

→ loading of all R.D. Ribos A-D onto Gel for gel extraction

→ Gelextraxtion using the PCR purification kit, nanodrop measurements on the eppis (3-5ng/µl)

Ligations of the Riboswitches into next vectors

Ribo A clones 4 +5, (R.D. with E + S) with CFP and YFP (R.D. with E+X) (see 12.08.)

Ribo B clone 2, (R.D. with X + P) with Part1 and Part3 (R.D. with S+P) (see 12.08.)

Ribo C clone 4, (R.D. with E + S) with Part8 (R.D. with E+X) (see 12.08.)

Ribo D clone 5 (R.D. with X + P) with Part1 and Part3 (R.D. with S+P) (see 12.08.)

For that, all of the inserts (60ng) was used for ligation ino the Vectors (20ng)

0,75-1µl Vectors

12µl Insert (Ribo A-D)

2µl T4 Buffer

2µl T4 Ligase

3-3,25µl H20

20µl reaction

Incubation overnight at 16°C

MiniPrep of RBSrev + pSB1C3, Prom1rev + part6.2, Prom3rev + part 6.2 (C1 – C3 each)

-          kit: Nucleospin, Macherey-Nagel

-          1st elution: 30 μl HPLC-water (pre-warmed), incubation for 2 min at 50 °C

-          2nd elution: 22 μl HPLC-water (pre-warmed), incubation for 2 min at 50 °C

-          no concentration measurement, since NanoDrop is dirty and measures 6 – 7 ng DNA in HPLC water used as a blank before…

-          samples stored in “DarR reporter system” - box

PCR to test, if RBSrev C1 – C3 are positive or negative 

-          RBSrev insert has only 12 bp →  one would not see it in a gel

-          in Colony PCR, there was for all clones a band at height of terminator band (re-ligand)

-          perform PCR to test, if terminator band is really there/ if clones are positive

-          PCR (similar to colony PCR, but with plasmids as a template):

Component

Volume

Taq

1 μl

10x Taq buffer

2.5 μl

dNTP mix

1 μl

iGEM_38 (VF2) 1:20

1 μl

iGEM_39 (VR) 1:20

1 μl

dH2O

17.5 μl

template

1 μl

Total

25 μl

 

 

-          of the plasmids prepped today (see MiniPrep), a 1:20 dilution was prepared, of this dilution, 1 μl was used a template (1 reaction for each clone)

-          as an additional control, part 7 C1 plasmid (dilution from 15.6.13, 1:10) was used

-          Neg. control: 1 μl water as a template

-          preparation of a 6x MasterMix:

 

Component

Volum

Taq

6μl

10x Taq buffe

15μl

dNTP mix

6μl

iGEM_38 (V2) 1:20

6μl

iGEM_39 (VR) 1:20

6μl

dH2O

105μl

Total

144μl

→ addition of 24 μl MasterMix to each sample

-          PCR protocol: same as for colony-PCR

Test restriction digest of Prom1rev + part6.2, Prom3rev + part 6.2 (C1 – C3 each) 

-          of the plasmids prepped today, 2 μl were used for the digest, since the concentration could not be measured with NanoDrop

-          one reaction contained

Component

Volume

plasmid

2μl

10x FD Green buffer

1μl

EcoRI FD

PstI FD

1μl

dH2O

5μl

Total

10μl

 

-          the plasmid was added to the tubes, then addition of 8 μl MasterMix; the MasterMix consisted of…

Component

Volume

10x FD Green buffer

7μl

EcoRI FD

7μl

PstI FD

7μl

dH2O

35μl

Total

56μl

 

 

-          incubation at 37 °C for 1 h

 

Gel run:

 

-          1 % agarose-1xTAE gel

-          loading of 3 μl 2 log ladder

-          loading of 1 μl of uncut plasmid + 3 μl dH2O + 1 μl 5xLD

-          loading of 5 μl of RD reaction

-          run at 100 V

-          EtBr staining + destaining

-          UV detection

 Loading: Marker/Prom1rev + part6.2 C1 uncut/ Prom1rev + part6.2 C1 RD/ Prom1rev + part6.2 C2 uncut/ Prom1rev + part6.2 C2 RD/ Prom1rev + part6.2 C3 uncut/ Prom1rev + part6.2 C3 RD/ Prom3rev + part6.2 C1 uncut/ Prom3rev + part6.2 C1 RD/ Prom3rev + part6.2 C2 uncut/ Prom3rev + part6.2 C2 RD/ Prom3rev + part6.2 C3 uncut/ Prom3rev + part6.2 C3 RD/Marker

part 6.2 Re-ligand: 35 bp (Promoter 3) + 8 bp (Scar between promoter and DarR operator) + 14 bp (operator) + 8 bp (Scar between operator and part 6 GFP) + 876 bp (part 6 GFP) = 941 → ca. 940 bp should be visible in addition to pSB1C3 (2070 bp)

part 6.2 C1 plasmid and Promoter1rev/Promoter3rev: 112 bp (rev. Promoter) + 8 bp (Scar between rev. promoter and promoter 3) + 35 bp (Promoter 3) + 8 bp (Scar between promoter and DarR operator) + 14 bp (operator) + 8 bp (Scar between operator and part 6 GFP) + 876 bp (part 6 GFP) = 1061 → ca. 1060 bp should be visible in addition to pSB1C3 (2070 bp)

 

Conclusion:

All clones seemed to be positive, since fragments have slightly more than 1 kb and ca. 2 kb. Sequencing of C1 and C2 of each.

Sequencing results from 16.8.13

Terminatorrev + pSB1C3 C1 and C3: both clones contain the correct sequence of the terminator, but in reverse direction

DarRrev + pSB1C3 C1:

-          between NotI and PstI restriction site, an additional G is inserted

-          2nd base of 10th codon: A is missing

-          → don’t work with this clone! 

DarRrev + pSB1C3 C4:

-          all mutations from the forward primer are present at correct site

-          no other mutations observed

-          →  work with this clone

Restriction of Terminatorrev + pSB1C3 C1 for generating vector for ligation with DarRrev 

15 μl (ca. 1500 ng) plasmid Termrev C1 (from 16.8.13, 102.8 ng/μl)

4 μl SpeI FD

4 μl FD buffer 10x

17 μl dH2O

in total 40 μl

-         digest: 2 h at 37 °C

Restriction of DarRrev + pSB1C3 C4 for generating the insert for ligation with Termrev C1 vector

6 μl (ca. 1500 ng) plasmid Termrev C1 (from 16.8.13, 282.5 ng/μl)

3μl XbaI FD

3 μl PstI FD

4 μl FD buffer 10x

24μl dH2O

in total 40 μl

-         digest: 2 h at 37 °C

Gel run for DarRrev + pSB1C3 C4 and Terminatorrev + pSB1C3 C1 RDs and RBSrev Test PCRs (all from today, see above) 

-          1 % agarose-1xTAE gel

-          loading of 3 μl 2 log ladder

-          loading of 1 μl of uncut plasmid + 3 μl dH2O + 1 μl 5xLD

-          loading of 5 μl of RD reaction

-          loading of 5 μl PCR reaction (addition of 5 μl of 5xLD to each PCR sample)

-          run at 100 V

-          EtBr staining + destaining

-          UV detection

Loading: Marker/Terminatorrev C1 uncut/Terminatorrev + SpeI RD/DarRrev C4 uncut/DarRrev C4 + XbaI and PstI/RBSrev PCR: neg. control/RBSrev PCR: part 7 C1 plasmid/RBSrev PCR: RBSrev C1/RBSrev PCR: RBSrev C2/RBSrev PCR: RBSrev C3/Marker

-          Termrev C1 is digested incompletely, but since the DarRrev insert won’t be dephosphorylated, one can dephosphorylate the incompletely digested vector →  purifiy vector and digest with PstI

-          DarRrev C4 plasmid is digested completely →  purify DarRrev fragment with gel extraction

-          PCR: the plasmids part 7 C1 and the RBSrev C1, C2 and C3 showed the expected products, but the negative control had a band at ca. 200 – 300 bp (I’ve no explanation for that: the water I used was the same for all other reactions! And the other material as well. Could be Bacillus spores, unclean PCR tubes, or my DNA…? XD →  forget negative control (some people even don’t do no-template controls…), since expected products dominate/bands on neg. control seem not to be in lanes of all other samples →  prepare C1 for sequencing

Hybridization of RBSrev, Promoter1rev and Promoter3rev repeated  

-          RBSrev must be  cloned into Prom1rev/Prom3rev + part6.2 (from now on termed part 6.3A/B)

-          Promoter1rev and Promoter3rev must be cloned into shipping vector

-          hybridization performed as on 13.08.2013

-          samples stored at – 20 °C in DarR reporter system-box

Concentration measurement (NanoDrop worked again!) of plasmids purified today

Preparation of samples for sequencing by SeqLab

-          sample no. 3: Promoter1rev + part6.2 C1 (part 6.3 A C1) + VF2 (6 μl plasmid, purified today + 1 μl primer iGEM_38 1:5)

-          sample no. 4: Promoter1rev + part6.2 C2 (part 6.3 A C1) + VF2 (6 μl plasmid, purified today + 1 μl primer iGEM_38 1:5)

-          sample no. 5: Promoter3rev + part6.2 C1 (part 6.3 B C1) + VF2 (6 μl plasmid, purified today + 1 μl primer iGEM_38 1:5)

-          sample no. 6: Promoter3rev + part6.2 C2 (part 6.3 B C1) + VF2 (6 μl plasmid, purified today + 1 μl primer iGEM_38 1:5)

-          sample no. 7: RBSrev + pSB1C3 C1 + VF2 (6 μl plasmid, purified today + 1 μl primer iGEM_38 1:5)

PCR clean up of Termrev C1 + SpeI digest

-          with Qiagen PCR purification kit

-          500 μl PB buffer used

-          elution 1x with 30 μl HPLC water (pre-warmed), incubation at ca. 57°C for 2 min

sample stored at – 20 °C in DarR reporter system box, marked with green

Gel ex of DarRrev insert 

-          1%-agarose-1xTAE gel

-          addition of 9 μl 5x LD to 37 μl reaction

-          loading of whole reaction on gel

-          loading of 3 μl marker

-          loading of 1 μl uncut DarRrev C4 plasmid + 3 μl dH2O + 1 μl 5xLD

-          run at 85 V

-          5 min staining with EtBr, short destaining in water, UV detection briefly, then gel ex under low UV light, tried to do gel ex, but signal was too weak, so again brief staining and destaining, then gel ex was possible

Gel after gel ex:

-          a bit was lost, but that’s ok…

-          gel pieces weighed and stored in DarR reporter system box at – 20 °C

Fold ↑

Protein expression for crystallization of L. monocytogenes DAC domain

Protein expression for crystallization of L. monocytogenes DAC domain

-       Preparation of 10l LB medium

-       Inoculation of 2x 50ml LB medium containing ampicillin with 1013 cryo stock

-       Incubation o/n at 37°C with agitation

-           Measurement of OD600

-       Inoculation of 10x 1l LB medium containing ampicillin with culture having OD600=0,1

-       Incubation at 37°C until OD600=0,5-0,7

-       Add each 1ml of 1M IPTG to each 1l of culture

-       Incubation for 12-14h at 16°C with agitation

-       Measurement of OD600 and determine protein concentration and save samples for SDS-PAGE

-       Transfer each 500ml of cultures into centrifugation tubes and centrifuge for 10min at 5000rpm at 4°C

-       Resuspend pellet in 20ml buffer W

-       Pool solution of 2 pellets  and transfer protein solution into falcon tube

-       Centrifugation for 15min at 5000rpm at 4°C

-       Discard supernatant and store pellet at -20°C

 

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18th

Riboswitch A Clones 1, 2, 4 and 5 inocculated into 4ml Cm cultures for minipreps tomorrow

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Protein expression for crystallization of L. monocytogenes DAC domain

Protein expression for crystallization of L. monocytogenes DAC domain

-       Preparation of 10l LB medium

-       Inoculation of 2x 50ml LB medium containing ampicillin with 1013 cryo stock

-       Incubation o/n at 37°C with agitation

-           Measurement of OD600

-       Inoculation of 10x 1l LB medium containing ampicillin with culture having OD600=0,1

-       Incubation at 37°C until OD600=0,5-0,7

-       Add each 1ml of 1M IPTG to each 1l of culture

-       Incubation for 12-14h at 16°C with agitation

-       Measurement of OD600 and determine protein concentration and save samples for SDS-PAGE

-       Transfer each 500ml of cultures into centrifugation tubes and centrifuge for 10min at 5000rpm at 4°C

-       Resuspend pellet in 20ml buffer W

-       Pool solution of 2 pellets  and transfer protein solution into falcon tube

-       Centrifugation for 15min at 5000rpm at 4°C

-       Discard supernatant and store pellet at -20°C

 

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