Part:BBa_K2933245
RBS b+Linker h+His+Linker a+Sumo+Linker b+SPG-1+T7 terminator
This part consists of RBS, protein coding sequence(His+Linker a+Sumo+Linker b+SPG-1) and T7 terminator,and the biological module can be build into E.coli for protein expression. This part can be prefaced with promoters of different strengths and types to regulate expression function.
Sequence and Features
- 10INCOMPATIBLE WITH RFC[10]Illegal EcoRI site found at 298
- 12INCOMPATIBLE WITH RFC[12]Illegal EcoRI site found at 298
Illegal NheI site found at 75
Illegal NheI site found at 1263 - 21INCOMPATIBLE WITH RFC[21]Illegal EcoRI site found at 298
Illegal BglII site found at 187
Illegal BamHI site found at 386 - 23INCOMPATIBLE WITH RFC[23]Illegal EcoRI site found at 298
- 25INCOMPATIBLE WITH RFC[25]Illegal EcoRI site found at 298
- 1000COMPATIBLE WITH RFC[1000]
Usage and Biology
This composite part is made up with three basic parts, the His-Sumo tag, the cutting site of Prescission Protease and our target protein SPG-1. It encodes a protein which is SPG-1 fused with His-Sump tag. The fusion protein is about 42.2kD. In order to gain the highly purified target protein, we add GST tag in N-terminal of SPG-1 and combine the two parts with the cutting site of Prescission Protease. The fusion protein can be cut off at the cutting site by Prescission Protease. It is convenient for us to purify our target protein.
Molecular cloning
First, we used the vector pET-28bs to construct our expression plasmid. And then we converted the plasmid constructed to E. coli DH5α to expand the plasmid largely.
Figure 1. a: The PCR result of SPG. b: The verification results by enzyme digestion.
After verification, it was determined that the construction is successful. We converted the plasmid to E. coli BL21(DE3) for expression and purification.
Expression and purification
Pre-expression:
The bacteria were cultured in 5mL LB liquid medium with ampicillin(100 μg/mL final concentration) in 37℃ overnight.
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