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Mechanistic Pathways for the Photoisomerization Reaction of the Anchored, Tethered Chromophore of the Photoactive Yellow Protein and its Mutants ¶
Author(s) -
Imamoto Yasushi,
Kataoka Mikio,
Liu Robert S. H.
Publication year - 2002
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 - 10.1562/0031-8655(2002)0760584mpftpr2.0.co2
Subject(s) - chromophore , photoisomerization , microsecond , photochemistry , chemistry , mutant , isomerization , organic chemistry , catalysis , biochemistry , gene , physics , astronomy
We show by way of physical organic reasoning that the currently known photochemical results of the chromophore of photoactive yellow protein (PYP) are consistent with that expected of a least volume‐demanding process for an anchored, tethered chromophore. The primary photoreaction, interestingly, does not appear to involve a hula‐twist process. However, the latter might be involved during subsequent transition of dark intermediates. Absorption data of intermediates obtained from a microsecond time‐resolved spectroscopic study of three PYP mutants (E46Q, T50V and R52Q) are consistent with the above analyses.