Part:BBa_K1150004

PhyB

PhyB
Function	Photoreceptor
Use in	Mammalian cells
RFC standard	RFC 25
Backbone	pSB1C3
Organism	Arabidopsis thaliana
Source	AG Weber, Freiburg
Submitted by	[http://2013.igem.org/Team:Freiburg Freiburg 2013]

Phytochrome B is a photoreceptor which detects red and far-red light. In Arabidopsis thaliana , Phytochrome B predominantly controls seedling establishment. It is a protein with a molecular mass of 125 kDa that is predominantly located in the cytoplasma. Its structure can be roughly divided in two parts: The N-terminal part, regulatory and photosensory, and the C-terminal part, regulatory. The N-terminal part is covalently bound to phytochromibilin. Phytochromibilin is a linear tetrapyrol that undergoes conformational changes upon radiation of either red- or far red-light when bound to the phytochrome moiety. This conformational change is responsible for the photosensory properties of PhyB. [1]
Illumination with red light (660 nm wavelength) leads to binding of Phytochrome Interaction Factor 6 (PIF6). The interaction can be abolished by illumination with far-red light (740 nm) wavelength.
Team Freiburg 2013 uses Phy B to induce gene activation or repression via light stimulus. Therefore Phy B can be fused to effector domains like VP16 or KRAB.

References

[1] Lars-Oliver Essen, Jo Mailliet, and Jon Hughes 2008; Quail 2002

Sequence and Features

Assembly Compatibility:

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

  Illegal BglII site found at 490
  Illegal BamHI site found at 572
  Illegal XhoI site found at 523
  Illegal XhoI site found at 542
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  INCOMPATIBLE WITH RFC[1000]

  Illegal SapI site found at 739