9irk

Structural highlights

Function

PHYB_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.^{[1] [2]}

References

1. ↑ Kim DH, Kang JG, Yang SS, Chung KS, Song PS, Park CM. A phytochrome-associated protein phosphatase 2A modulates light signals in flowering time control in Arabidopsis. Plant Cell. 2002 Dec;14(12):3043-56. PMID:12468726
2. ↑ Ryu JS, Kim JI, Kunkel T, Kim BC, Cho DS, Hong SH, Kim SH, Fernandez AP, Kim Y, Alonso JM, Ecker JR, Nagy F, Lim PO, Song PS, Schafer E, Nam HG. Phytochrome-specific type 5 phosphatase controls light signal flux by enhancing phytochrome stability and affinity for a signal transducer. Cell. 2005 Feb 11;120(3):395-406. PMID:15707897 doi:http://dx.doi.org/10.1016/j.cell.2004.12.019