Part:BBa_K3096040
A constitutively active promoter expresses Clts, a temperature sensitive cI repressor of the lambda phage. If the temperature is significantly below 37°C (body temperature), Clts is an active repressor for the cI lambda promoter. This promoter controls the transcription of a repressor protein, AraC. Therefore, if conditions are not 37°C, the AraC is not available, hence the pBAD promoter, controlled by AraC, is active and genes controlled by the pBAD promoter are transcribed. Accordingly, if the temperature is at 37°C, Clts is unstable and cannot repress the expression of AraC. AraC consequently inhibits the pBAD promoter and downstream genes are not expressed. The usage of the Clts and following FadR sensing system was the iGEM NTU Taida Project of 2012
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