Part:BBa_K2933213
T7 promoter+RBS b+Linker h+His+Linker f+JOHN-1+T7 terminator
This part consists of T7 promoter, RBS and protein coding sequence（His+Linker f+JOHN-1），and the biological module can be built into E.coli for protein expression.
Sequence and Features
- 10INCOMPATIBLE WITH RFC[10]Illegal XbaI site found at 47
Illegal PstI site found at 280 - 12INCOMPATIBLE WITH RFC[12]Illegal NheI site found at 169
Illegal PstI site found at 280 - 21COMPATIBLE WITH RFC[21]
- 23INCOMPATIBLE WITH RFC[23]Illegal XbaI site found at 47
Illegal PstI site found at 280 - 25INCOMPATIBLE WITH RFC[25]Illegal XbaI site found at 47
Illegal PstI site found at 280 - 1000INCOMPATIBLE WITH RFC[1000]Illegal SapI.rc site found at 804
Usage and Biology
This composite part is made up with seven basic parts, the His tag, T7 promoter, RBS ，Linker h ，Linker f，T7 terminatorand and our target protein JOHN-1. It encodes a protein which is JOHN-1 fused with His tag.Linker h is from the vector pET-28a, which connects the RBS to His tag sequence.Linker f from vector pGEX-6p-1, contains the thrombin restriction site and T7 tag. The fusion protein is about 28.1 kD. In order to gain the highly purified target protein, we add His tag in N-terminal of JOHN-1 . It is convenient for us to purify our target protein.
Molecular cloning
First, we used the vector pGEX-28a to construct our expression plasmid. And then we converted the plasmid constructed to E. coli DH5α to expand the plasmid largely.
Figure 1. The PCR result of JOHN-1.
After verification, it was determined that the construction is successful. We converted the plasmid to E. coli BL21(DE3) for expression and purification.
References
[1]Naas Thierry,Bellais Samuel,Nordmann Patrice. Molecular and biochemical characterization of a carbapenem-hydrolysing beta-lactamase from Flavobacterium johnsoniae.[J]. Journal of Antimicrobial Chemotherapy,2003,51(2).
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