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The chromophore structural changes during the photocycle of phytochrome: A combined resonance raman and quantum chemical approach
Citation key ISI:000245735400004
Author Mroginski, M A and Murgida, D H and Hildebrandt, P
Pages 258-266
Year 2007
ISSN 0001-4842
DOI 10.1021/ar06000523
Address 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Journal Acc. Chem. Res.
Volume 40
Number 4
Month APR
Publisher AMER CHEMICAL SOC
Abstract Phytochromes are sensory photoreceptors that, upon light irradiation, can be transformed between an inactive and an active state. The conversion is initiated by the photoisomerization of the cofactor, a linear methine-bridged tetrapyrrole, followed by conformational relaxations of the chromophore and the protein matrix that finally leads to the formation of the signaling state. To elucidate the underlying molecular processes, resonance Raman spectroscopy combined with quantum chemical calculations constitutes a powerful approach since it allows determination of the chromophore structure in the various states of phytochrome. On the basis of these studies, a molecular model for the photoinduced reaction cycle is derived. Phytochromes are sensory photoreceptors that, upon light irradiation, can be transformed between an inactive and an active state. The conversion is initiated by the photoisomerization of the cofactor, a linear methine-bridged tetrapyrrole, followed by conformational relaxations of the chromophore and the protein matrix that finally leads to the formation of the signaling state. To elucidate the underlying molecular processes, resonance Raman spectroscopy combined with quantum chemical calculations constitutes a powerful approach since it allows determination of the chromophore structure in the various states of phytochrome. On the basis of these studies, a molecular model for the photoinduced reaction cycle is derived.
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