期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2003
卷号：100
期号：10
页码：5938-5943
DOI：10.1073/pnas.1031791100
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：In Neurospora, the flavin adenine dinucleotide-containing protein WHITE COLLAR-1 is the blue-light photoreceptor for the circadian clock and other light responses. The putative chromophore-binding domain of WC-1, its light, oxygen, or voltage (LOV) domain, is similar to the LOV domains found in the plant phototropins, the Neurospora VIVID (VVD) protein, and the Arabidopsis FKF1 and its related proteins. Studies of the plant phototropins have identified 11 flavin-contacting residues that are also conserved in the LOV domains of WC-1, VVD, and FKF1. In this study, by mutating the putative WC-1 flavin-binding sites, we show that these sites are important for the light function of the protein, suggesting that the WC-1 LOV domain adapts a structure similar to that of the phototropin LOV domains. By creating a Neurospora strain in which the LOV domain of WC-1 is swapped with that of VVD, we show that the LOV domain of VVD partially replaces the function of the WC-1 LOV domain, suggesting that VVD is a wc-dependent photoreceptor in Neurospora. Furthermore, we show that the Neurosporastrains containing a chimeric WC-1 protein with the LOV domain from FKF1 or phot1 can also sense light, suggesting that FKF1 and its related proteins are light sensors in Arabidopsis. Taken together, our data suggest that these LOV domains are structurally similar protein modules involved in blue-light sensing.
