Team:Buenos Aires/ protocols
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# Let the tube open until it is dried. The pellet must turn from white to transparent. | # Let the tube open until it is dried. The pellet must turn from white to transparent. | ||
# Add 20 ul of dH2O and freeze. | # Add 20 ul of dH2O and freeze. | ||
+ | |||
+ | |||
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+ | =Transformation= | ||
+ | |||
+ | We have E. Coli DH5α strain competent bacteria, with a transformation efficiency of 10 | ||
+ | |||
+ | '''Important!''' Competent bacteria should always be on ice. | ||
+ | |||
+ | * If the plasmid comes from the kit or is a product of ligation, add 2μl of plasmidic DNA into 50μl | ||
+ | |||
+ | of competent bacteria. If it’s a plasmid that comes from a miniprep, use a mass in function of | ||
+ | |||
+ | the efficiency of the bacteria. | ||
+ | |||
+ | * Incubate for 20 min on ice. | ||
+ | |||
+ | * Heat Shock: 42°C for exactly 1’30’’, then immediately place on ice. | ||
+ | |||
+ | * Incubate for 5 min on ice. | ||
+ | |||
+ | * Recovery: Add 950μl of LB without antibiotic, incubate from 30 min to an hour at 37°C | ||
+ | |||
+ | * Pellet the bacteria by centrigue at 10000rpm for 5 minutes. Discard the supernatant of LB. | ||
+ | |||
+ | Resuspend the bacteria in the remnant LB. | ||
+ | |||
+ | * Plaque onto plates with LB and the desired antibiotic. | ||
+ | |||
+ | * Incubate overnight in a stove at 37°C | ||
+ | |||
+ | |||
+ | |||
</div> | </div> |
Revision as of 23:01, 22 September 2013
Contents |
MINIPREP
Materials
- Resuspension buffer
- Lysis buffer
- Neutralization buffer
- Isopropanol
- 70% Etanol
- dH2O
- Ice (in ice bucket/container)
Procedure
- Centrifuge for 5 minutes at 5000 rpm 1,5 ml of bacteria culture.
- Take the pellet and add 250 ul of resuspension buffer and pipet up and down a few times.(make sure that all is properly mixed)
- Add 250 ul of Lysis buffer and invert the tubes 5 times to mix. Let rest 5 minutes. The mix must turn transparent.
- Add 250 ul of cold Neutralization buffer and invert the tubes 5 times to mix. The mix must turn turbid.
- Centrifuge at 13.000 rpm for 15 minutes.
- Transfer the supernatant to a new clean eppendorf tube.
- Add isopropanol (the same volume that is in the tube). Mix many times and put it in ice for 20 minutes.
- Centrifuge at 13.000 rpm for 20 minutes.
- Eliminate the supernatant (be carefull that the pellet does not go with it)
- Add 1 ml of etanol 70% and use a vortex to ensure the pellet mixes with the etanol.
- Centrifuge at 13.000 rpm for 5 minutes.
- Eliminate all the supernatant with a pipette (be carefull that the pellet does not go with it)
- Let the tube open until it is dried. The pellet must turn from white to transparent.
- Add 20 ul of dH2O and freeze.
Transformation
We have E. Coli DH5α strain competent bacteria, with a transformation efficiency of 10
Important! Competent bacteria should always be on ice.
- If the plasmid comes from the kit or is a product of ligation, add 2μl of plasmidic DNA into 50μl
of competent bacteria. If it’s a plasmid that comes from a miniprep, use a mass in function of
the efficiency of the bacteria.
- Incubate for 20 min on ice.
- Heat Shock: 42°C for exactly 1’30’’, then immediately place on ice.
- Incubate for 5 min on ice.
- Recovery: Add 950μl of LB without antibiotic, incubate from 30 min to an hour at 37°C
- Pellet the bacteria by centrigue at 10000rpm for 5 minutes. Discard the supernatant of LB.
Resuspend the bacteria in the remnant LB.
- Plaque onto plates with LB and the desired antibiotic.
- Incubate overnight in a stove at 37°C