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Replacement of riboflavin by an analogue in the blue-light photoreceptor of Phycomyces

Otto, M. K. and Jayaram, M. and Hamilton, R. M. and Delbrück, M. (1981) Replacement of riboflavin by an analogue in the blue-light photoreceptor of Phycomyces. Proceedings of the National Academy of Sciences of the United States of America, 78 (1). pp. 266-269. ISSN 0027-8424.

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Under suitable conditions, roseoflavin [7-methyl-8-dimethylamino-10-(1'-D-ribityl)isoalloxazine] replaces riboflavin to about 80% in the photoreceptor of Phycomyces. The substitute-bearing photoreceptor functions with an efficiency of about 0.1% of that of the normal receptor. The substitution is proven by (i) a decrease of the effective light flux by a factor of 4.7, expressed as a corresponding increase in threshold, and (ii) an increase of the effectiveness of 529-nm light relative to 380-nm light. It has also been shown that roseoflavin is taken up by the mycelium, translocated to the sporangiophore, and effectively phosphorylated by the riboflavin kinase of Phycomyces.

Item Type:Article
Additional Information:© 1981 by the National Academy of Sciences. Contributed by Max Delbrück, September 12, 1980. The research was supported by National Science Foundation Grant PCM 76-15164 and by a fellowship from the Deutsche Forschungsgemeinschaft to M.K.O. The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. §1734 solely to indicate this fact.
Subject Keywords:roseoflavin; photobiology
Record Number:CaltechAUTHORS:OTTpnas81
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8671
Deposited By: Tony Diaz
Deposited On:04 Sep 2007
Last Modified:14 Nov 2014 19:20

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