Team:Arizona State/Lab/Protocols/Competency

From 2011.igem.org

Revision as of 19:05, 26 September 2011 by Ethan ward (Talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)


Protocols: Competency


ASU Logo.png
 

NEB cells


These cells can be ordered from [http://www.neb.com/nebecomm/products/category95.asp New England Biolabs] and should be stored at -80C. To transform, follow the NEB cell transformation protocol.

[http://openwetware.org/wiki/Preparing_chemically_competent_cells TSS cells]


Materials:

Preparation:

  1. Grow a 5ml overnight liquid culture of cells in LB broth. After 12 hours, dilute this culture back into 25-50ml of fresh LB broth in a conical flask, diluting the overnight culture by at least 1/100.
  2. Grow the diluted culture to an OD600 of 0.2 - 0.5 (1-2 hours).
  3. Chill X (where X is the volume in ml of your culture) eppendorf tubes so that they are cold when cells are aliquoted into them later. Chill TSS buffer.
  4. Split the culture into two 50ml falcon tubes and incubate on ice for 10 min.
All subsequent steps should be carried out at 4C and the cells should be kept on ice wherever possible
  1. Centrifuge for 10 minutes at 3000 rpm and 4C.
  2. Pour / pipette off supernatant.
  3. Fully resuspend in chilled TSS buffer, using 10% of the culture volume that you spun down.
  4. Add 100 μl aliquots to your chilled eppendorfs and store at -80C.