Part:BBa_K1919100

This device is a combination of two parts submitted by previous igem teams that one （BBa_K608351） is a temperature-regulated promoter followed by the other （BBa_K1497008 ）that a gene coding for a protein hokD which induces cell lysis. The promoter we chose won’t start translation until the temperature is raised to 37℃. And at 42℃ can we get the peck efficiency of expression. The promoter is in fact a composite sequence that preceding the regulated promoter is the control sequence which can synthesis λ cI repressor. λ cI repressor binds with the promoter sequence when environment temperature is 28~30℃ while at 42℃, the protein denatures and falls off by which initiate the transcription. We use the temperature-regulated promoter to express hokD gene. The hokD gene of E. coli transcribes for a small polypeptide that causes cell death by elimination of vital cell wall functions. In short , our device can induce cell lysis when temperature is raised to 42℃.

To deliver the antimicrobial peptides in the right place and at the right time, we designed and constructed this temperature-regulated device. When put under the sole of feet, our peptide-expressing E.coli cells in the insole would be incubated at a warmer environment due to body temperature. We use this promoter to control the synthesis of hokD for the raised temperature will promote the translation of hokD which following the promoter.