Sci. Signal., 2 August 2011
Coming Together in the LightThe filamentous fungus Neurospora crassa uses two blue-light sensors, white collar-1 (WC-1) and VIVID (VVD), both of which contain light, oxygen, or voltage (LOV) domains, to regulate its responses to light. WC-1 and WC-2 form a complex (WCC) to drive expression of light-induced genes, including vvd, whereas VVD tunes responses to light by directly interacting with and antagonizing the function of WCC. Vaidya et al. solved the crystal structure of the light-induced dimer of VVD and compared it to previously determined structures of the dark-state, monomeric protein. This analysis revealed that light not only induced a conformational change in the positioning of the N-terminal cap of one subunit of VVD but also triggered the opening of a binding pocket in the opposing subunit, into which the N-terminal cap could dock. Determining the structure explained the functional responses observed in vvd-deficient Neurospora that expressed variant VVD proteins and may inform mechanisms by which LOV-containing proteins interact.
Citation: A. T. Vaidya, C.-H. Chen, J. C. Dunlap, J. J. Loros, B. R. Crane, Structure of a Light-Activated LOV Protein Dimer That Regulates Transcription. Sci. Signal. 4, ra50 (2011).
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