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BLUE LIGHT PHOTORECEPTION IN Neurospora ORCADIAN RHYTHM: EVIDENCE FOR INVOLVEMENT OF THE FLAVIN TRIPLET STATE
Author(s) -
Fritz Bernhard J.,
Kasai Sabu,
Matsui Kunio
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.tb01973.x
Subject(s) - neurospora crassa , conidiation , neurospora , circadian rhythm , flavin group , singlet oxygen , circadian clock , biology , oxygen , rhythm , biophysics , cryptochrome , photochemistry , microbiology and biotechnology , chemistry , genetics , biochemistry , medicine , neuroscience , enzyme , mutant , organic chemistry , gene
The mechanism of the photoreceptor acting on the circadian conidiation rhythm of Neurospora crassa was studied, with the following results: (1) the efficiency of 8‐haloflavins as sensitizers increased with their triplet yields. (2) Phase shifts were not abolished by removal of oxygen prior to illumination. (3) Oxygen inhibited phase shifts when introduced into the cultures after light treatment. It is proposed that the blue light photoreceptor for the circadian clock of Neurospora crassa acts (1) from its triplet state, but (2) not via singlet oxygen; (3) signal transduction involves (an) oxygen‐sensitive intermediate(s).