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- W2154191010 abstract "Phytochromes are molecular light switches by virtue of their photochromic red/far-red reversibility. The His-324 residue next to the chromophore-linked Cys-323 plays a critical role in conferring photochromism to the tetrapyrrole chromophore in native phytochrome A. The chromophore appears to be enclosed between the amphiphilic α-helical chains in a hydrophobic pocket. The absorbance maxima of both the Pr and the Pfr forms of pea phytochrome A are blue-shifted by 10 and 20 nm, respectively, upon C-terminal truncation. We speculate that the quaternary structure of the phytochrome A molecule involves some interactions of the C-terminal half with the chromophore domain. The Pfr conformation of phytochrome includes an amphiphilic α-helix of the amino terminal chain, which occurs in 113 ms after picosecond photoisomerization of the Pr form. Compared to α-helical folding, unfolding of the α-helix occurs faster in about 310 μs upon phototransformation of the Pfr form of phytochrome A. The photochromic transformation of phytochrome A modulates protein kinase-catalysed phosphorylation sites in vivo and in vitro, but only a subtle local change in conformation is detectable in the phosphorylated phytochromes. This suggests that the post-translational modification serves as a surface label, rather than a transducer-activating trigger, for the recognition of a putative phytochrome receptor." @default.
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- W2154191010 date "1997-06-01" @default.
- W2154191010 modified "2023-10-18" @default.
- W2154191010 title "Chromophore: apoprotein interactions in phytochrome A*" @default.
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- W2154191010 doi "https://doi.org/10.1046/j.1365-3040.1997.d01-103.x" @default.
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