Coding

Part:BBa_K1017301

Designed by: Wen-Hui Cheng   Group: iGEM13_NCTU_Formosa   (2013-09-12)
Revision as of 15:03, 26 September 2013 by AggieTsai (Talk | contribs) (Mechnism)

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 PompC.

Nctu formosa cph8mechnism.jpg

Mechnism

Cph8 can serve as a photoreceptor that regulates gene expression through Pompc. 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 PompC then lacI gene is translated, repressing Plac.


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]


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