Team:Heidelberg/Meetings
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Revision as of 00:21, 4 October 2013
Meetings.
We met regularly together with all our advisors and instructors to discuss the project strategy, to distribute tasks and to initilize additional social events.
NRPS – Delfibactin project
by Ilia
1. delfibactin:
- export from biocompartiments: unspecific outer membrane transporter (so delfibactin gets into medium)
- synthesis: pathway known, e.coli strain for production (maybe not clone DelC)
2. NRPS: introduction
- modular enzymes: 3 modular domains (together 110 kDa)
- steps: adenylation, acylation, condensation
3. software: input
- match amino acid to known A-domain substrates
- recognize easy modification (in amino acids) for which substrate you need it
- method: substructure based algorithm for searching and predicting substrate specifity
- it works in a R-package
- 10 amino acids are important for the substrate specifity
4. biobrick library
- there is no standard for the Biobricks of NRPS
GHB
by Flo and Nils
1. Jugend forscht: done a test (we do not understand how it works)
- not reached the supervisor yet
- she didn't win anything
- detect it via Spectrometry
2. 3 ideas for integrating the receptor
- artifiial membranes are not an option (you can't predict how the protein is located)
- in vitro expression of GPCRs (takes too long)
- Luciferase activity under directt ligand-dependent control of muscarinic acetylcholine receptor
=> measurments possible (very sensitive: represses glowing a little bit, a bit more... but never completely) (integrate it is fast, but the mutagenesis takes a long time)
Artificial yeast-cells for sensing Insulin-level and producing/distribute the Insulin
by Flo
- presentation of the idea and past igem projects regarding this theme
- semipermeable biocapsules (with cells inside)
- the cells (yeast , bacillus subtilis, e.coli... ) for producing insulin if it is necessary
- there exists a famous lab for synthetic biology which works on insulin production
Software Project
by Julia, Konrad and Hanna
- parameters for statistical analysis and how they correlate (like teammembers, advisors, organsims, score regarding a scoring funtion)
- graphics: basically histograms
work for the next weeks
1. software project
- look on the focus of the team!
- better definition of the parameters
- estimate the cost of an IGEM project (there exists something for the nature paper... just looking at the methods etc...)
- already made something with these parameters
- clustering for example, not only directed
- software project should be finished before the lab phase: end of June/ July
2. Gold Project
- working on this project: Nils, Ilia, Julia, Ralf, Hanna
- find stuff we have to order and send Dominik an email => done!
- talk to companies (interested, is it done already and how, are there established assays)
- find succesful examples
3. general information
- we have to register and then apply for the team. LogIn
- send an email for getting the contact details (parameters which here already used)
Agenda for next meeting (29.04.2013 at 5 pm)
- results of pilot project (delfibactin in the lab)
- present a project plan (goals, time etc.)
- update on the software project. How to proceed etc.
Structure and Project Proposal:
- will be written in the Wiki
- catchy pictures have to be placed into the part Motivation / State of the Art
- Abstract has to be added
- - hanger gold or NRPS? --> probably start with NRPS and outline gold-project as application
- - depends on how many other teams choose gold-project
- - gold into the project-title?
- outlook/final statement has to be added
- postpone costs, work on timeschedule
- methods have to be described more precisely --> look for experimental protocols
- what has to be formulated in the PP was written down in note form
- deadline for motivation part: Wednesday, April 17th evening
- general deadline: Monday, April 22nd evening
- deadline schedule, material + costs, final part + abstract: Wednesday, April 24th evening
Cloningmethods
- ask advisors for additional introduction to cloningmethods --> Nikos (Wednesday)
Laborplan Pre-project
- prepare ACM (1,5L + 0,5L (mit Agar)) Phytogel(NOT with Agar)
- reactivation solution (without agar)
- 0,5% agarose solution with ACM (maybe water) with 10mM AuCl3
- purification
- HP 20 resin-beads: the Delftibactin attaches to the resin
- Methanol dissolves the Delftibactin, afterwards dry (rotary vacuum)
- resuspend it (in 2ml)
Motivation for Proposal (discussed with Tim & Tinka)
- central idea: NRPS (gold is the application)
- Weighing not clear
- start with gold
- Structure: Application = Framework
- Main part: relevance of NRPS
- generally more elaborate (not too much details)
- more numbers (tons of gld recycled)
- more structure
- why this pathway for gold precipitation and not another one
- don't use might or may
- softwareproject: how important is it for the gold?? why is it important??? judgement
- Trends of IGEM: no NRPS so far, thus new project for IGEM -> helps students and scientist in finding trends, etc...
3. Podiums discussion 27.6.13
- 18.00 talk about synthetic biology
- 18.30 discussion
- church, politics, scientists, NGOs(?) - 5 people
- Prof. Tanner
- first of all: make a concept with our goal
- catering afterwards (sponsoring)
Cloning
- BACs
- amplify genes via PCR (Problem, same Codons for E.coli and D.acidovorans)
- maybe not optimal codons
- Synthesis is not possible
- Biobrickstandard: separation in 1 Kb sequenzes
- first plasmids with one protein each
- then plasmids with multiple proteins
- and another try with whole pathway (BAC)
- now we need to find experts and ask them for help
Cloning Techniques/Strategies (Dominik)
- BBa (BioBrick Standard)
- Golden Gate
- Gibson Assambly
Discussion on Experimental Procedures
- Transformations
- Cosmids
- BACs
NRPS Library - with Discussion
- main ideas
- swaping of domains done already
- Q: Biology behind the System? (short presentation by Ilia on monday?)
Agenda for next meeting (29.04.2013)
- presentation of NRPS (library) (Ilia)
- presentation about methodology (BAC, PAC, Cosmide, Gibson Assambly (Fanny, Flo, Hanna, Joshua, Nicos)
- schedule (Hanna, Julia) ?
Ressource Collection
- Vector Design
- Gibson, D.G. et al. (2009) Nature Methods, 343–345.
- Gibson, D.G. et al. (2010) Nature Methods, 901–903.
- Reserach on NRPS
- AG Marahiel, Marburg --> Niels
- AG Cryle, MPI Heidelberg --> Konrad
further planning
- Sat. 4. May: primer Design meeting ("Giant Inserts in E. coli")
Gold
- we were able to reproduce the paper --> images with gold
- delftibactin purification didn't work by now --> try again
recapitulation of NRPS domains and modularity
- domains that are essential: C: Condesantion, A: Adenylation, T: Thiolation
what has been done
- simplification of synthases (smaller linkers) -> no negative effects
- replacement of alanin to serene by changing domain
- module extention
- short de-novo NRPs
NRPS biobrick library
- produce a library with different combinable NRPS-subunits
- start with producing staphcillin (has already been done --> realistic to achieve)
Coloured NRP: indigoidine (Ralf)
- we could prove the modularity of our NRPS-library by producing indigoidine
- is a blue dye
- synthesized from 2 gylcin molecules with a certain enzyme
- there are only a few cutting sites in the required genes
Cosmide (Hanna)
- insert size 50kbp
- has got cos site --> in vitro packaging
- has got only very few cutting sites (BamH1)
- selection maker: ampicillin
- check of digestion with 0.8% agarose gel
- preparation with phenol/chloroform extraction
Phagemids & PACs (Flo)
Phagemids
- you can infect cells with phages or by electroporation
- 10-20 kbp
- high yield of DNA
- E. coli have too be competent for F-Phages
- DNA extraction via phages
PACs
- p1 artificial chromosomes
- hybrid system of plasmid and p1 phage replication
- insert size 70-150 kbp
- transformation using phages
- isolation with kit possible (QIAGEN)
- good transformation-rate but complex system
- you have to be very careful working with phages --> easy contamination
BACs (Fanny)
Recombineering
- well established system
- 150-350 kbp
- low copy numbers
- "lamda red recombination" using 3 viral genes: 5'-3' exonuclease, overhang binding protein, inhibitor of bacterial exonuclease
- use of cassette with pos and neg selection marker
- electroporation of gene of interest
- cloning: cassette is brought into the BAC by homologous recombination --> also several times possible
- there is a library of E. coli strains which already have the cassette
Gibson cloning (Nikos)
- iGEM biobrick standard will be hard for us to realize --> delH
- we will promote modularity with the NRPS library
- for the gold project we will likely use gibson cloning
- we will talk about primer design on saturday (4th May)
- start PCR as soon as possible
Cloning
- DelH (review of the work done so far)
- primers were designed and ordered
- DelH gene first try with plamsid backbone: pSB6A1
- AraC Promoter, RBs, lacZ, low ori pMB1, amp-R
- PacI and KpnI are not in DelH gene, thus used for ligation
- DelA to P into single plasmid with about 26kbp: pSB4K5
- lacI Promoter, RBs, mRFP1, low ori pSC101, Kan-R
- Hanna's work so far: Top 10 E.coli
- pSB4K5 with Insert
- pSB6A1
- AraC
- lacZ
- pSB1C3 with insert
Are supposed to be joined by cloning to complete backbones by Monday
- Indigoidine
- similar to DelH
- pSB1C3
- high ori 0034, lacI promoter, mRFP1, Cm-R
- similar to DelH
- cloning with +TypeII RE (recognize sequence and then cut at site one nucleotide next to recognition site)
- division into three fragments
ask Dominik:
- how exactly does this strategy work?
- when is this an appropriate strategy to use?
- Is "PCR Ligation" also a good Method (seperate PCRs for fragments; primers have "overlapping tail" takend from next fragment; ligation of fragments in one single PCR")?
Important! What about Freiburg? are they willing to help us with Gibson Cloning?
Approach of the Next Few Weeks
What should be bought: ---> Konrad's list
- divison into smaller groups dealing with the main topics of our projects:
- Indigoidine (closed): Rald, Konrad, Nikos
- Del H lab protocol/methods (closed) : Hanna, Fanny, Sophie
- Del Rest (A to P) (closed) : Flo, Ilia, Nikos, Nils
- NRPS : Tania, Joschua, Ilia
- Software : Nils, Ilia, Konrad, Joschua, Hanna
Decisions Made
- serial cloner should be our main software used for primer design etc.
- Should use tool for oligo 2ndary structre prediction
- http/mfold.rna.albany.edu
- Should create common primer list; structure as in the following:
- continous number, primer name, abbreviation (initials), sequence, details (if possible with a link to protocol used), creator, date, evaluation (e.g. worked, low yield ... )
Agenda for next meeting (13.05.2013 6 pm)
- all groups meet up seperately and continue working
- brief presentation on next meeting
- next meeting (with Dominik)
- progress report of individual groups and lab
- prepping for upcoming big meeting
- Next big meeting will be 15.5.2013
Breakfast
- socializing =)
Catching Up on Lab Work (Hanna)
- news on the lab work
- present protocol
Gibson Cloning Primer Design (Nils)
presentation:
- Backbone pSB1C3, lacI, RBS, mRFP1, Cm-R, pMB! ori
- finding data for introduction of RBS-DelE (PacI and KpnI)
- design of four primers
- 2 for backbone
- 2 for insert
- go to parts registry, search pSB1C3
- shows sequence and features --> get selected sequence
- look at sequence in Serial Cloner
- graphic map should show sequence and particular RE sites (bold names are unique sites, italic names are not existing sites)
- look for cutting site that is not present in backbone nor insert/cassette
- find cassette BBa_503495 sequence in parts registry (not standardized, not best example)
- add cassette sequence to backbone sequence
- show in graphic map
- get DelE sequence (has a lot of PstI cutting sites, but EcoRI only a single site --> can be mutated)
- Primer for adding RBS and cuttingssites between backbone and insert
- If primer gets too large one can make two PCR steps
- methyl specific cutting enzymes can digest backbone to separate the PCR amplified
- Primer nomenclatur: Kürzel_Nummer:Protein_CuttingSite_fw/rev
- Buffer of Restriction enzymes should be compatible
- Forward primer protein: Overhang - cutting site e.g. PacI - RBS - 6bp (can be used to enhance specifity when taken from gDNA) - atg-Start of Protein - additional 22-27 bp for specificity (or smaller for big primers) - last one should be G/C, no repetitive G/C if possible
- Reverse primer protein: Overhang - cutting site e.g. KpnI (reverse complementary in case of non palindromic enzymes) - reverse complementary end of protein
- Primers should be same melting temperature / length
- Watch out for first and second melting temperature and other reactions run in parallel!
- Forward primer backbone: Overhang - cutting site e.g. KpnI - backbone specific sequence starting with RBS
- Reverse primer backbone: Overhang - cutting site e.g. PacI - reverse complementary sequence of backbone until RBS
- design of four primers
- Fold DNA on mfold:
- 3' end should be accessible
- 5' end can be varied (overhang)
- wobble base pairs can be replaced
- change length of primer to reduce folding
- target would be a folding free energy > -2
- Run in silico PCR in serial cloner
- target melting temperature between 60 and 70°C (if possible - not a critical parameter)
- if you make mutagenesis the sequence is not complementary anymore!
- Evaluate PCR chacks for complementary parts and gives product length
- Annotation
- Features of sequence in serial cloner
- in gene bank files
Ribosomal binding sites (Konrad)
- Current Plan:
- add medium RBS for every part
- RBS in Del Cluster
- RBS from Data base in file (Mail Konrad)
- We can see the direction of transcription according to the primers
Use of J5 for Gibson assembly (Nikos)
- Parts in device editor all at once
- Plasmid backbone
- RBS
- Several parts for Insert - every mutation is a single bp part
- Define how tot obtain the part
- most of the PCR amplified
- other option would be digestion
- RBS would be embedded in a primer
- Choose none for very small parts since it will choose lowest cost strategy
- Controls
- Choose parameters
- Choose Assembly meths
- Result is Vector Editor
- Can show restriction sites
- Primer sequences in csv file
- Gives you cloning strategy
Agenda for next meeting (13.05.2013 18:00)
- One point per sub group
- NRPS
- Software
- Del
- Indi
- Define agenda for 15.5.
Group picture
NRPS subgroup (Julia, Philipp)
- Possible cloning standards
- Handing in biobricks only in pSB1C3 (RFC10 standard)
- RFC25 (scar 6bp) standard because RFC10 scar (7 bp) causes frameshift
- Parts to be cloned from Tyc
- T domains either in front of E or in front of C --> cloning 1 per group
- A and C as single domains and as couple in parallel
- E domains and Thioesterase
- Cutting sites
- not in Tyc A/B/C SpeI, EcoRI, XbaI, NgoMIV
- Tyc B NgOMIV in C domain, in T-C linker
- Tyc C PStI in CIII domain, NotI in AIII domain
Indigoidine subgroup
- Plasmid optimised for eucariotic cells
- Impossible to clone it as RFC10
- Use RFC21 instead -> compatible with Tyc?
- first as whole part
- Can be transformed wihtin in this week
- primer design within this week
Cloning standard discussion
- Gibson!!!
- find good reason, concept for Gibson cloning
- standard cloning techniques unfeasible
- Further plan
- Order all he plasmids and strains for permeable strain (BAP1 strain, red plasmid, FLP plasmid, template plasmid)
- Indigoidine (Ralf) RFC 21 + check for other NRPS (Ilia) pathways
- Modularity of Indigoidine RFC 21
- in parallel check on Gibson assembly in Freiburg (Dominik)
- get Backbones from Washington (Fanny)
Software subgroup (Konrad)
- subgroups for data mining, data management, statistical analysis, front end
- right now mainly building data management + concept for frontend and analysis
- starting with NRPS software only makes sense as soon as NRPS gives any positive results
- next one and a half weeks for being productive and then we decide for or against the project
Delftibactin subgroup
- 8 and 10 kb successfully amplified
- digest tomorrow
- Ligating AraC promotor this week
- If cloning in E.coli doesn't work we skip Del or search for different organism (next week earliest)
- definitely no restrictiton based cloning -> depending on Gibson cloning technique
Miscellaneous
- Send EMail to registry: How to submit parts? , Promote system open for new standards. (Fanny)
- We should find a plan B for Delftibactin!
- in vitro parts expression, ex vivo delftibactin synthesis?
Agenda for next meeting (15.05.2013)
- State of the lab (Hanna)
- Further plan (Fanny)
- Gibson approach (Flo, Nikos)
- Enzymatic cloning and dependencies of NRPS and indigoidine (Nikos)
- Software project deadlinev + plan (Julia, Philipp)
- Budgetplanung (Prof. Eils)