種子裡面有一個感光器(蛋白質),稱為光敏色素 (phytochrome),它可以吸收紅光 – 它的原始狀態或同種型稱為 Pr(Phytochrome A Red 光敏素-鈍化型,“ r” 代表紅光)。 當這種植物色素吸收紅色光子時,其物理狀態會從 Pr 變成 Pfr(Phytochrome A Far Red 光敏素-活化型,“fr” 表示遠紅色)。當Pfr 吸收遠紅色...
Using the existing experimental evidences, we have proposed a three-dimensional (3D) structure for Pr, Pfr, and intermediates and a mechanism for the photoisomerization as well. Structures were fully optimized using AM1 (Unichem package on a Cray J90-NACAD). Using the INDO/S method of Zerner...
PHYTOCHROME is a plant photomorphogenetic pigment existing in two forms, Pr and Pfr, interconvertible by light, which have absorption peaks in the red and far-red regions of the spectrum respectively1,2. Intermediates between Pr and Pfr have been studied by several techniques in vivo and in ...
The Pfr-phytochromes dephosphorylates in the N-ter- minal extension and the hinge region is relieved from phosphory- lation mediated destabilization, exhibiting a high affinity to signal transducers. However, the unphosphorylated Pfr-phytochromes were not. Furthermore, the phosphorylated Pr-phytochromes...
Pr型为蓝色,吸收峰在波长660纳米的红光部分;Pfr 型为黄绿色,吸收高峰在波长730纳米的远红光部分。两种形式的光敏素吸收相应波长的光后分别转化成另一种形式。由于两种形式的吸收光谱有部分重叠,只是吸收率不同,所以在不同波长的光下进行不同程度的相互转化,形成不同的Pr/Pfr比值。 除了光形态发生效应以外,光敏素...
We investigated some of the chemical and physical differences between the red-absorbing (Pr) and far-red-absorbing (Pfr) forms of immunoaffinity-purified, undegraded oat (Avena sativa L., ev. Garry) phytochrome. Both Pr and Pfr had ident... RE Hunt,LH Pratt - 《Biochemistry》 被引量: 81...
— Light absorbed primarily by the protein of phytochrome is active in transforming both the red and far-red absorbing forms. Pr and Pfr. The ratio of quantum yields for the conversions of Pr and Pfr by u.v. radiation (φr/φfr)u.v.= 1.5 and does not differ significantly from the ra...
Many aspects of plant photoperception are mediated by the phytochrome (Phy) family of bilin-containing photoreceptors that reversibly interconvert between inactive Pr and active Pfr conformers1,2. Despite extensive biochemical studies, full understanding of plant Phy signalling has remained unclear due ...
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Chromophore incorporation, Pr to Pfr kinetics, and Pfr thermal reversion of recombinant N-... Schaffner (1998) Chromophore incorporation, Pr to Pfr kinetics, and Pfr thermal reversion of recombinant N-terminal fragments of phytochrome A and B chromo... Remberg,Anja,Ruddat,... - 《Biochemistry...