Team:Warsaw/Calendar-Main/31 July 2008

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Cloning of truncated fragment of protein A (ΔA)

Michał K.

Transformation of E. coli TOP10 strain with ligation products (pACYC177+OmpA_alpha + ΔA and pACYC177+OmpA_omega + ΔA).
Transformants plating on LB + kanamycin.

Cloning of omega_ΔA DNA fragment to pACYC177+OmpA_alpha

Michał K.

Isolation of plasmids from cultures inocluated on previous day.
Control digest of isolated plasmids with BamHI and SacI (BamHI buffer).
Gel electrophoresis - proper clones founded (Fig. 1.).

Fig. 1. Control SacI/BamHI digests of isolated plasmids 1-4. digested plasmids pACYC177 + OmpA-omega-ΔA-alpha 5. Marker

Purification of proteins: Z-alpha and Z-omega

Piotr, Emilia

Samples were resuspended in PBS, sonicated and centrifuged.
Lysis buffer was added separately to pellet and supernatant, then samples were boiled for 10 min.
Lysates loaded on 12% poliacrylamide gel (amount relating to 100 μl of OD=1.0 culture).
Gel stained with Coomassie Blue. Optimal induction conditions chosen (Fig. 2. and Fig. 3.).

Fig. 2. Pellets from Z-omega induction with various IPTG concentrations The arrow shows place of our overexpressed protein: 1. 22°C 0.5 mM IPTG 2. 22°C 0.1 mM IPTG 3. 22°C 1 mM IPTG 4. Marker 5. negative control 6. 37°C 0.1 mM IPTG 7. 37°C 0.5 mM IPTG 8. 37°C 1 mM IPTG

Fig. 3. Pellets and supernatants from Z-alpha induction with various IPTG concentrations The arrow shows place of our overexpressed protein: 1. Marker 2. pellet negative control 3. supernatant negative control 4. pellet 37°C 0.1 mM IPTG 5. supernatant 37°C 0.1 mM IPTG 6. sonicate 22°C 0.1 mM IPTG 7. sonicate 22°C 0.5 mM IPTG 8. pellet 37°C 0.5 mM IPTG 9. supernatant 37°C 0.5 mM IPTG