Part:BBa_K2922025

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 were building this circuit, we did the nucleic acid gel electrophoresis experiment to verify. After the circuit was built, we sent the plasmid to sequence, and got the correct sequencing. After new molecular cloning experiments, we did Enzyme-Cut identification to certify the plasmid was correct. We used the XbaI and PstI to cut the plasmid, then we got 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

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]