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PHYTOCHROME and PROTEIN PHOSPHORYLATION
Author(s) -
Singh Bal Ram,
Song PillSoon
Publication year - 1990
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1990.tb01781.x
Subject(s) - phosphorylation , phytochrome , protein phosphorylation , chemistry , microbiology and biotechnology , biophysics , biochemistry , biology , botany , protein kinase a , red light
— The molecular mode of signal transduction triggered by phytochrome is unknown. One characteristic structural/topographic feature of the physiologically active form (Pfr) of phytochrome is that its tetrapyrrole chromophore becomes preferentially exposed in the Pfr form (compared to the Pr form). Phytochrome in its Pfr form appears to affect phosphorylation of cellular proteins. The literature on the phytochrome‐mediated protein phosphorylation has been reviewed in an attempt to search for the role of the chromophore topography of phytochrome in the signal transduction process. In order to initiate a dephosphorylation‐phosphorylation cascade as a possible step for the signal transduction, it may interact with a cellular protein kinase to inhibit its activity. This hypothesis has been reviewed with results from phosphorylation inhibition assays by the Pfr form of phytochrome and in light of the inhibition of protein kinase activity by tetrapyrroles in general.