Team:Berkeley Wetlab/Passenger: TypeIII Needle scFv
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Contents |
Dot Blot
This assay measures the success of surface display of typeIII needle scFv and its ability to bind specifically to espA protein, a subunit of the typeIII needle complex in EHEC.
constructs:
Needle scFv (14)
Gliadin neg control (2)
No pass neg control (14)
1363 neg control (1)
All experiments are done in triplicate
cell growth and induction
- grow cells to saturation overnight (12+ hours)
- dilute culture 1:100 into media with arabinose and induce for 5-12hours
- pipet 100ul of cells to Costar V-bottom polystyrene plate and take OD
- pellet cells and flick out media
incubation with espA protein
- add 5ul of espA protein to 95ul of PBS buffer and resuspend cells in solution
- incubate for 1.5 hours
- wash 3X with PBS buffer on plate washer
- take OD on 3rd wash
- after last wash, pellet cells, and resuspend in 50ul lysis buffer
- heat for 15-20 minutes to lyse all cells
dot blot and visualization
- pipet 5ul of cell lysate onto nitrocellulose paper and allow to dry completely
- wet nitrocellulose with 10ml of 1X TBST for 5minutes
- block with 2% BSA (.2g BSA in 10ml 1X TBST)for 1 hour
- wash 3X with TBST - 5minutes/wash
- add 4ml of 1:500 Anti-His HRP: TBST, wait 30minutes
- wash 3X with TBST - 5minutes/wash
- leave the last wash on for developing
- add 3mls of chemiluminescent reagents to the nitrocellulose paper and take pictures