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EVENTS IN THE PHYTOCHROME MOLECULE AFTER IRRADIATION
Author(s) -
Rüdiger Wolfhart
Publication year - 1992
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.1751-1097.1992.tb02236.x
Subject(s) - tetrapyrrole , chromophore , phytochrome , isomerization , photochemistry , chemistry , phycocyanin , phycobiliprotein , fluorescence , molecule , irradiation , kinetics , biliverdin , heme , cyanobacteria , optics , red light , organic chemistry , physics , catalysis , biology , botany , genetics , quantum mechanics , bacteria , nuclear physics , enzyme , heme oxygenase
— The photoconversion of Pr to Pfr has been investigated by a large number of investigators. We have previously demonstrated that Z,E isomerization of the tetrapyrrole chromophore is involved in the photoconversion. It is the best candidate for the primary photoreaction. Conformation and configuration of the Pr chromophore will be compared with that of chromophores in phycocyanin. The crystal structure of phycocyanin had been elucidated by x‐ray analysis. Proton transfer and/or Z, E isomerization of the tetrapyrrole are probably involved in different steps of the photoconversion in phytochrome and in photoreversible phycobiliproteins. Fluorescence decay kinetics of irradiated Pr and intermediate formation show heterogeneity. Possible reasons for this heterogeneity will be discussed.