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Phototropins and Their LOV Domains：Versatile Plant Blue-Light Receptors

Journal of Integrative Plant Biology 2007年第1期49卷 4-10页

作者： Winslow R. Briggs Tong-Seung Tseng Hae-Young Cho Trevor E. Swartz Stuart Sullivan Roberto A. Bogomolni Eirini Kaiserli John M. Christie Department of Plant Biology Carnegie Institution of Washington Stanford CA 94305 USA Plant Science Group Division of Biochemistry and Molecular Biology Institute of Biomedical and Life Sciences University of Glasgow Glasgow G12 8QQ UK Department of Chemistry University of California Santa Cruz CA 95064 USA

The phototropins phot1 and phot2 are plant blue-light receptors that mediate phototropism, chloroplast movements, stomatal opening, leaf expansion, the rapid Inhibition of hypocotyl growth in etiolated seedlings, and possibly solar tracking by leaves in those species in which It occurs. The phototroplns are plasma membrane-associated hydrophilic proteins with two chromophore domains （designated LOV1 and LOV2 for their resemblance to domains In other signaling proteins that detect light, oxygen, or voltage） in their Nterminal half and a classic serine/threonlne kinase domain in their C-terminal half. Both chromophore domains bind flavin mononucleotide （FMN） and both undergo light-activated formation of a covalent bond between a nearby cystelne and the C（4a） carbon of the FMN to form the signaling state. LOV2-cystelnyl adduct formation leads to the release downstream of a tightly bound amphlpathlc α-helix, a step required for activation of the klnase function. This cysteinyl adduct then slowly decays over a matter of seconds or minutes to return the photoreceptor chromophore modules to their ground state. Functional LOV2 is required for light-activated phosphorylation and for various blue-light responses mediated by the phototroplns. The function of LOV1 is still unknown, although It may serve to modulate the signal generated by LOV2. The LOV domain Is an ancient chromophore module found In a wide range of otherwise unrelated proteins In fungi and prokaryotes, the latter Including cyanobacterla, eubacterla, and archaea. Further general reviews on the phototropins are those by Celaya and Liscum （2005） and Christie and Briggs （2005）.

关键词： blue-light receptor flavin-cysteinyl adduct LOV domain phototropin phototropism

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