Streptococcus Transformation: Difference between revisions
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| CTM pH 6.8 || CTM pH 7.8 || 0.39 Absorbance | | CTM pH 6.8 || CTM pH 7.8 || 0.39 Absorbance | ||
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| BHI pH 7.4 || | | BHI pH 7.4 || 430ul culture + 50ul mM NaOH + 5ul 20% BSA + 2ul 100mM CaCl2 || 0.1 Absorbance | ||
|- | |- | ||
| Columbia pH 7.4 || Columbia pH 6.6 || 0.05 Absorbance. With our Spectrometer, impossible. Use 0.13 Absorbance; dilute 4-fold with pre-warmed Columbia pH 7.4; wait 30 minutes and then use. | | Columbia pH 7.4 || Columbia pH 6.6 || 0.05 Absorbance. With our Spectrometer, impossible. Use 0.13 Absorbance; dilute 4-fold with pre-warmed Columbia pH 7.4; wait 30 minutes and then use. |
Revision as of 12:39, 18 September 2023
Generic Protocol
- Grow fresh colonies (1-2 days old -- use a significant number) in 3ml of media 'A'.
- Preheat a microcentrifuge tube of 270ul media 'B' to 37 degrees using the hot block.
- Occasionally, check for growth to appropriate Absorbance. When the cells have grown enough:
- Add 2ul CSP-1 peptide to these tubes. (more than 100 ng/ml eventual final concentration. In aliquots in the -80 freezer; 20ul aliquots of 100uM. Talk to Eric if you are not working with a D39 derivative.)
- Add DNA to 1 ug/ml final concentration — so 300ng.
- Add 30ul of grown cells (a 1:10 dilution).
- Vortex; incubate at 37 degrees for 60 minutes using the hot block.
- Warm up 2.7ml TSB in a test tube for each transformation using the hot block.
- At the end of the 60 minute incubation, add all 300ul of the transformation to each TSB test tube.
- Incubate for 60 minutes (or longer) in the 37 degree, 5% CO2 incubator.
- Either:
- Pre-warm blood plates with appropriate antibiotics OR on a TSA plate with appropriate antibiotics. Label plates.
- Add 6-7 glass beads
- Plate 500ul of sample AND 25ul added catalase (if using a TSA plate), put onto the plate the same time as the bacteria
- Use beads to distribute.
- Allow plates to completely dry in hood.
- Or,
- During this second 60 minute incubation, change the hot block to 42 degrees and put in 2 empty test tubes per transformation.
- Melt and pipet 3.5ml TSB soft agar into each test tube.
- Warm up TSB plates with appropriate antibiotics by placing them in either 37 degree incubators. Move to the hood and label plates.
- After the second 60 minute incubation, add 10ul of catalase and 10ul of TCC to each soft agar tube. There's no need to add antibiotics to the soft agar.
- Add 2 x 750ul of the transformation to a soft agar tube (using a micropipettor, not a serological pipet), immediately vortex for 3-5 seconds and immediately pour onto a TSB plate. The agar will solidify quickly, so do this step one soft agar tube at a time.
- Repeat the above step with a second plate, so that all 3ml of the transformation is used.
- For (-), no DNA controls, feel free to only plate a total of 1.5ml onto a single TSB plate. Repeat for all transformations, one soft-agar tube at a time.
- Wait 3-5 minutes for all plates to solidify
- Incubate for 1-2 days in 37 degree, 5% CO2 incubator
Media 'A' (Growth Media) | Media 'B' (Transformation Media) | Grow to Absorbance |
---|---|---|
C+Y pH 7.4 | C+Y pH 7.4 | 0.52 Absorbance |
CTM pH 6.8 | CTM pH 7.8 | 0.39 Absorbance |
BHI pH 7.4 | 430ul culture + 50ul mM NaOH + 5ul 20% BSA + 2ul 100mM CaCl2 | 0.1 Absorbance |
Columbia pH 7.4 | Columbia pH 6.6 | 0.05 Absorbance. With our Spectrometer, impossible. Use 0.13 Absorbance; dilute 4-fold with pre-warmed Columbia pH 7.4; wait 30 minutes and then use. |
Recipes
C+Y Recipe
Complete Transformation Medium (CTM)
- 3g Tryptic Soy Broth
- 0.1g yeast extract
- Fill up to 100ml MilliQ water and autoclave
- Add to a final concentration filter sterilized 1mM CaCl2 (found on chemical shelf), filter sterilized 0.2% BSA (Bovine Serum Albumin), and filter sterilized 1X trace mineral solution (found on chemical shelf)
Competence Protocol with CRISPR
- As above, but add the editing construct at a final concentration of 0.7 - 2.5 ug/ml (210ng - 750ng total DNA)
- Incubate at 37 degrees using the hot block for 20 minutes.
- Add the CRISPR targeting construct at a final concentration of 0.7 - 2.5 ug/ml (mirroring the first set of DNA), and vortex.
- Incubate at 37 degrees using the hot block for 40 minutes.