Team:Warsaw/Calendar-Main/30 July 2008

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Purification of proteins: Z-alpha and Z-omega

Piotr, Emilia

  1. pET15b+Z_alpha and pET15b+Z_omega in Rosetta strain from overnight culture inoculated in fresh LB and cultured until OD=0,5.
  2. Cultures induced with different concentrations of IPTG in 22°C and 37°C.
  3. Samples were collected twice: after 3h and next day (samples were centrifuged and frozen).

Cloning of omega_ΔA DNA fragment to pACYC177+OmpA_alpha

Michał K.

Separate transformant colonies (tranformation of ligation of pACYC177+OmpA_alpha and omega_ΔA from previous day) inoculated to liquid LB with kanamycin.

Cloning of truncated fragment of protein A

Michał K.

  1. Optimization of PCR to obtain truncated fragment of protein A DNA.
    Primers: AL+SacI AP+NotI
    Template DNA: pDRIVE-TapTag
    Elongation time: 30s
    - Optimization of annealing temperature (gradient from 55°C to 75°C) Fig. 1
    - Optimization of number of cycles(15, 20, 25, 30, 35) Fig. 2
  2. PCR to obtain truncated A protein DNA fragment.
    Primers: AL+SacI AP+NotI
    Template DNA: pDRIVE-TapTag
    Elongation time: 30s
    Annealing temperature: 60°C
    20 cycles
  3. Gel electrophoresis and gel-out of 250 bp band.
  4. Digest of isolated PCR product, pACYC177+OmpA_alpha and pACYC177+OmpA_omega with NotI and SacI (BamHI buffer). pACYC177 vectors were also dephosphorylated.
  5. Clean-up of digest reaction.
  6. Gel electrophoresis for estimation of DNA concentration.
  7. Overnight ligation: pACYC177+OmpA_alpha + ΔA and pACYC177+OmpA_omega + ΔA.
Fig. 1. Gradient PCR to obtain shortened protein A (temperatures: 55-75°C)
1. Marker
2. 50°C
3. 55°C
4. 60°C
5. 65°C
6. 70°C
7. 75°C
Fig. 2. PCR to obtain shortened protein A (various number of cycles)
1. Marker
2. 15 cycles
3. 20 cycles
4. 25 cycles
5. 30 cycles
6. 35 cycles