Part:BBa_K1017301

Cph8(cph1-envZ)

The red light sensor (Cph8) is a fusion protein which is consisted of a phytochrome Cph1 and a histidine kinase domain, Envz-OmpR, that includes a response regulator.Cph1 is the first member of the plant photoreceptor family that has been identified in bacteria. The functional expression of a phytochrome domain(Cph1) in E. coli requires the biosynthesis of the respective bilin chromophore PCB. EnvZ-OmpR, a dimeric osmosensor, is a multidomain transmembrane protein and one of the best characterized two-component histidine kinases from E.coli.

With the biosynthesis of PCB, Cph1 serve as a red-light absorbing chromophore that is inactivated under red light and activated without red light. Upon changes of extracellular osmolarity, EnvZ specifically phosphorylates its cognate response regulator OmpR, which, in turn, regulates the P_ompC.

Mechnism

Cph1 is only active when it binds the chromophore phycocyanobiline (PCB). Far red light(or darkness) activates the EnvZ kinase which results in the phosphorylation of OmpR and it activates as a transcription factor.On the other hand, red light deactivates the kinase and therefore the genes downstream can not be expressed. Take the image beneath as an example, in the dark, the phosphorylated OmpR will turn on P_ompC then lacI gene is translated, repressing P_lac.

Sequence and Features

Barcodes are discontinued, but one was appended to the sequence of this part. Composite parts using this part will include the barcode. More ...

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal XhoI site found at 364
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]