Difference between revisions of "Part:BBa K2922025"

Revision as of 12:51, 19 October 2019

Colicin-E1 immunity protein coding region

Summary

Abbreviated as Eimm, the molecular weight of Colicin-E1 immunity protein is 13 kDa, and the protein is encoded by gene imm. In wild strains of E.coli, the protein is able to protect cells, which harbors the plasmid ColE1 encoding Colicin-E1, against Colicin-E1. Immunity proteins interact with the pore-forming domain in the inner membrane. And the inactivation of Colicin-E1 occurs via interactions between the voltage-gated region and the transmembrane helices of the immunity protein. This protein will prevent E.coli secreting Colicin-E1 from killing themselves.[1] (Fig.1)

Fig.1 Eimm prevents E.coli BL21 (DE3) secreting Colicin-E1 from killing themselves.

Identification

When we are building this circuit, we are doing the nucleic acid gel electrophoresis experiment to verify. After the circuit is built, we send the plasmid to sequence, and get the correct sequencing. After new molecular cloning experiments, we do Enzyme-Cut identification to certify the plasmid is correct. We use the XbaI and PstI to cut the plasmid, then we getting the target separate fragment- 342bp. (Fig.2)

Fig.2 The result of this plasmid cut with enzyme XbaI and PstI.

Reference

[1] H. Y. Song, W. A. Cramer, Membrane topography of ColE1 gene products: the immunity protein. Journal of Bacteriology 173, 2935 (1991).

Sequence and Features