Team:Slovenia/PROJECT/proof/studies
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[[Image:SLOvsi-western.jpg|thumb|center|700px|''Western blot confirmed isolated zinc fingers.''' We have been able to detect purified proteins with anti-his primary antibodies on Western blot. Arrows indicate each protein and its molecular weight.''']]<br><br> | [[Image:SLOvsi-western.jpg|thumb|center|700px|''Western blot confirmed isolated zinc fingers.''' We have been able to detect purified proteins with anti-his primary antibodies on Western blot. Arrows indicate each protein and its molecular weight.''']]<br><br> | ||
- | All six proteins were also | + | All six proteins were also analysed with circular dichroism spectroscopy. All proteins contain the expected secondary structure: |
- | [[Image:CDvsiprot(Matej).jpg|thumb|center|700px|'''CD spectroscopy proved | + | [[Image:CDvsiprot(Matej).jpg|thumb|center|700px|'''CD spectroscopy proved the isolated proteins form the expected secondary structure.''' Secondary structure was determined with CD spectroscopy. From this figure we can see that most of the purified proteins refolded mainly iton α-helical structure with small portion of random coil, except Gli wich contains mostly α-helical structure.]]<br><br> |
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Latest revision as of 17:24, 27 October 2010
Contents |
Cloning scheme
Before any in vitro characterisation, DNA-binding proteins had to be obtained. Zinc fingers were firstly tri-point ligated with a particular split GFP and T7 promoter and T7 terminator sequence were added afterwards. T7 promoter enables high production of proteins in E. coli BL21(DE3)pLysS production strain. Zinc fingers were then purified using His tags and used in subsequent experiments. Parts used for production were: BBa_323001, BBa_323015, BBa_323069, BBa_323058, BBa_323004, BBa_323070.
Protein production
Zinc fingers were produced in E.coli BL21(DE3)pLysS and purified with Ni-NTA column according to our protocols in Methods & Parts. Their isolation and purity was confirmed with SDS-page and Western blot techniques. Secondary structure of proteins was determined with circular dichroism. Purified proteins were further used for electrophoretic mobility shift assay (EMSA) test and surface plasmon resonance (SPR) experiments.
All six proteins were also analysed with circular dichroism spectroscopy. All proteins contain the expected secondary structure: