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Science 18 August 1995:
Vol. 269. no. 5226, pp. 968 - 970
DOI: 10.1126/science.7638620
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Articles

Science, Vol 269, Issue 5226, 968-970
Copyright © 1995 by American Association for the Advancement of Science

articles

Association of flavin adenine dinucleotide with the Arabidopsis blue light receptor CRY1

C Lin, DE Robertson, M Ahmad, AA Raibekas, MS Jorns, PL Dutton, and AR Cashmore

Department of Biology, University of Pennsylvania, Philadelphia, 19104, USA.

The arabidopsis thaliana HY4 gene encodes CRY1, a 75-kilodalton flavoprotein mediating blue light-dependent regulation of seedling development. CRY1 is demonstrated here to noncovalently bind stoichiometric amounts of flavin adenine dinucleotide (FAD). The redox properties of FAD bound by CRY1 include an unexpected stability of the neutral radical flavosemiquinone (FADH.). The absorption properties of this flavosemiquinone provide a likely explanation for the additional sensitivity exhibited by CRY1-mediated responses in the green region of the visible spectrum. Despite the sequence homology to microbial DNA photolyases, CRY1 was found to have no detectable photolyase activity.


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Photorepair mutants of Arabidopsis.
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Development 122, 683-693
   Abstract »    PDF »
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   Full Text »    PDF »
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