8isi
From Proteopedia
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== Function == | == Function == | ||
| - | [https://www.uniprot.org/uniprot/PHYA_ARATH PHYA_ARATH] Regulatory photoreceptor which exists in two forms that are reversibly interconvertible by light: the Pr form that absorbs maximally in the red region of the spectrum and the Pfr form that absorbs maximally in the far-red region. Photoconversion of Pr to Pfr induces an array of morphogenetic responses, whereas reconversion of Pfr to Pr cancels the induction of those responses. Pfr controls the expression of a number of nuclear genes including those encoding the small subunit of ribulose-bisphosphate carboxylase, chlorophyll A/B binding protein, protochlorophyllide reductase, rRNA, etc. It also controls the expression of its own gene(s) in a negative feedback fashion. Involved in the flowering time regulation. Can phosphorylate FHY1 and, possibly, FHL, in red light conditions; this inactivates their co-shuttling to the nucleus (PubMed:19208901). Regulates phototropic responses both in the nucleus (e.g. hypocotyl elongation and cotyledon opening under high-irradiance conditions and seed germination under very-low-fluence conditions) and in the cytoplasm (e.g. negative gravitropism in blue light and red-enhanced phototropism) (PubMed:17566111).<ref>PMID:12468726</ref> <ref>PMID:15707897</ref> <ref>PMID:17566111</ref> <ref>PMID:19208901</ref> <ref>PMID:19482971</ref> <ref>PMID:21969386</ref> | + | [https://www.uniprot.org/uniprot/PHYA_ARATH PHYA_ARATH] Regulatory photoreceptor which exists in two forms that are reversibly interconvertible by light: the Pr form that absorbs maximally in the red region of the spectrum and the Pfr form that absorbs maximally in the far-red region. Photoconversion of Pr to Pfr induces an array of morphogenetic responses, whereas reconversion of Pfr to Pr cancels the induction of those responses. Pfr controls the expression of a number of nuclear genes including those encoding the small subunit of ribulose-bisphosphate carboxylase, chlorophyll A/B binding protein, protochlorophyllide reductase, rRNA, etc. It also controls the expression of its own gene(s) in a negative feedback fashion. Involved in the flowering time regulation. Can phosphorylate FHY1 and, possibly, FHL, in red light conditions; this inactivates their co-shuttling to the nucleus (PubMed:19208901). Regulates phototropic responses both in the nucleus (e.g. hypocotyl elongation and cotyledon opening under high-irradiance conditions and seed germination under very-low-fluence conditions) and in the cytoplasm (e.g. negative gravitropism in blue light and red-enhanced phototropism) (PubMed:17566111). Promotes seed germination, suppression of hypocotyl elongation, and randomization of hypocotyl growth orientation in far-red light; these responses to far-red light are repressed by UNE10/PIF8 (PubMed:31732705). Stabilizes UNE10/PIF8 but sequesters PIF3/PAP3 from its target genes promoters in far-red light (PubMed:31732705).<ref>PMID:12468726</ref> <ref>PMID:15707897</ref> <ref>PMID:17566111</ref> <ref>PMID:19208901</ref> <ref>PMID:19482971</ref> <ref>PMID:21969386</ref> <ref>PMID:31732705</ref> |
== References == | == References == | ||
<references/> | <references/> | ||
Current revision
Photochromobilin-free form of Arabidopsis thaliana phytochrome A - apo-AtphyA
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Categories: Arabidopsis thaliana | Large Structures | Gao N | Ma C | Wang J | Zhang Y | Zhao J
