Phototropin-1

UniProtKB accession:  O48963

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Protein kinase that acts as a blue light (BL) photoreceptor in a signal-transduction pathway for photo-induced movements (PubMed:29101334, PubMed:31904040, PubMed:14739272, PubMed:15821287). Triggers the phosphorylation of AHA1 and AHA2 C-terminal penultimate Thr in guard cells to activate them and induce stomatal opening in response to blue light (BL) (PubMed:15821287, PubMed:31904040). Phosphorylates also BLUS1, a kinase involved in stomatal opening (PubMed:23811955). Mediates the phosphorylation of CBC1 in stomata, but not of CBC2, in response to blue light (PubMed:29101334). 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.