4n6r
From Proteopedia
Crystal structure of VosA-VelB-complex
Structural highlights
FunctionVOSA_EMENI Component of the velB-VosA heterodimeric complex that plays a dual role in activating genes associated with spore maturation and repressing certain development-associated genes (PubMed:17912349, PubMed:21152013, PubMed:23049895, PubMed:24391470). Controls primarily the late process of sporulation including trehalose biogenesis (PubMed:17912349). The complex binds DNA through the DNA-binding domain of vosA that recognizes an 11-nucleotide consensus sequence 5'-CTGGCCGCGGC-3' consisting of two motifs in the promoters of key developmental regulatory genes (PubMed:24391470). The vosA-velB complex binds to the beta-glucan synthase fksA gene promoter in asexual spores for repression (PubMed:25960370).[UniProtKB:A0SP16][1] [2] [3] [4] Publication Abstract from PubMedMorphological development of fungi and their combined production of secondary metabolites are both acting in defence and protection. These processes are mainly coordinated by velvet regulators, which contain a yet functionally and structurally uncharacterized velvet domain. Here we demonstrate that the velvet domain of VosA is a novel DNA-binding motif that specifically recognizes an 11-nucleotide consensus sequence consisting of two motifs in the promoters of key developmental regulatory genes. The crystal structure analysis of the VosA velvet domain revealed an unforeseen structural similarity with the Rel homology domain (RHD) of the mammalian transcription factor NF-kappaB. Based on this structural similarity several conserved amino acid residues present in all velvet domains have been identified and shown to be essential for the DNA binding ability of VosA. The velvet domain is also involved in dimer formation as seen in the solved crystal structures of the VosA homodimer and the VosA-VelB heterodimer. These findings suggest that defence mechanisms of both fungi and animals might be governed by structurally related DNA-binding transcription factors. The Velvet Family of Fungal Regulators Contains a DNA-Binding Domain Structurally Similar to NF-kappaB.,Ahmed YL, Gerke J, Park HS, Bayram O, Neumann P, Ni M, Dickmanns A, Kim SC, Yu JH, Braus GH, Ficner R PLoS Biol. 2013 Dec;11(12):e1001750. doi: 10.1371/journal.pbio.1001750. Epub 2013, Dec 31. PMID:24391470[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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