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• W2002124239 abstract "Phototropin is a blue-light receptor of plants and comprises two light-receptive domains, LOV1 and LOV2, Ser/Thr kinase domain and one linker region connecting the LOV2 and the kinase domains. The LOV2 domain is thought to regulate predominantly the light-dependent autophosphorylation of the kinase domain, leading to cellular signaling cascades. In this study, we constructed recombinant LOV1, LOV2, and LOV2-linker polypeptides from phototropin 1 and phototropin 2 of Arabidopsis thaliana and studied their quaternary structures and light-dependent conformational changes by small-angle X-ray scattering. The molecular weights of the polypeptides determined from scattering intensities demonstrated the dimeric associations of LOV1 polypeptides of both isoforms. In contrast, while LOV2 and LOV2-linker polypeptides of phototropin 1 were homodimers, corresponding polypeptides of phototropin 2 existed as monomeric forms. Under blue-light irradiation, the LOV2-linker polypeptide of phototropin 1 displayed small but definite changes of the scattering profile. Through simulation of low-resolution molecular structures, the changes were likely explained as structural changes of the linker region and/or a movement of the region relative to the LOV2 domain. Light-induced profile changes were not observed in the Cys(512)Ala mutated LOV2-linker polypeptide of phototropin 1 losing the phototransformation capability. Thus, it was indicated that the photoreaction in the LOV2 domain probably caused the structural changes in the LOV2-linker polypeptide of phototropin 1. On the basis of the results, the interdomain interactions in phototropin are discussed." @default.
• W2002124239 created "2016-06-24" @default.
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• W2002124239 date "2004-11-01" @default.
• W2002124239 modified "2023-09-30" @default.
• W2002124239 title "Light-Induced Structural Changes of LOV Domain-Containing Polypeptides from <i>Arabidopsis</i> Phototropin 1 and 2 Studied by Small-Angle X-ray Scattering" @default.
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• W2002124239 doi "https://doi.org/10.1021/bi0485530" @default.
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