Phototropin-1 - O48963 (PHOT1_ARATH)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for O48963: 2
Protein kinase that acts as a blue light photoreceptor in a signal-transduction pathway for photo-induced movements. Phosphorylates BLUS1, a kinase involved in stomatal opening. Required for blue light mediated mRNA destabilization. Mediates calcium spiking of extracellular origin in response to a low rate of blue light. Also mediates rapid membrane depolarization and growth inhibition in response to blue light. Necessary for root phototropism. Involved in hypocotyl phototropism under a low rate but not under a high rate of blue light. Contributes to the chloroplast accumulation but seems not to be required for chloroplast translocation. Regulates stomata opening and photomorphogenesis response of leaf tissue. Confers sensitivity to drought. Not involved in hypocotyl elongation inhibition, anthocyanin accumulation or cotyledon opening. UniProt
Catalytic Activity
ATP + L-threonyl-[protein] = ADP + H+ + O-phospho-L-threonyl-[protein] UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Homodimer; disulfide-linked. Interacts with PKS1, PKS2, RPT2, RPT3, PHOT2 and BLUS1 (PubMed:10542152, PubMed:15031408, PubMed:16777956, PubMed:18585389, PubMed:20071603, PubMed:23811955). Subunit of a complex made of CAR6, PHOT1 and RPT3/NPH3 (PubMed:21367967). UniProt
The activation loop within the kinase domain is the target of phosphorylation (By similarity). The PAS (PER-ARNT-SIM) domains are required for the binding of FMN chromophores. UniProt
  • Organism: Mouse-ear cress
  • Length:
  • UniProt
  • Other Gene names: PHOT1, JK224, NPH1, RPT1, At3g45780, T6D9_110
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