4kui | pdb_00004kui

Crystal structure of N-terminal acetylated yeast Sir3 BAH domain

spinqualitylabelsall models 4kui, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4kui is a 1 chain structure with sequence from Baker's yeast. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACY, IPA NonStd Res: AYA Related: 4kud, 4kul Gene: SIR3, CMT1, MAR2, STE8, YLR442C, L9753.10 (Baker's yeast) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [SIR3_YEAST] The proteins SIR1 through SIR4 are required for transcriptional repression of the silent mating type loci, HML and HMR. The proteins SIR2 through SIR4 repress mulitple loci by modulating chromatin structure. Involves the compaction of chromatin fiber into a more condensed form. Publication Abstract from PubMed In Saccharomyces cerevisiae, acetylation of the Sir3 N terminus is important for transcriptional silencing. This covalent modification promotes the binding of the Sir3 BAH domain to the nucleosome, but a mechanistic understanding of this phenomenon is lacking. By X-ray crystallography, we show here that the acetylated N terminus of Sir3 does not interact with the nucleosome directly. Instead, it stabilizes a nucleosome-binding loop in the BAH domain. Nalpha-acetylated Sir3 stabilizes the conformation of a nucleosome-binding loop in the BAH domain.,Yang D, Fang Q, Wang M, Ren R, Wang H, He M, Sun Y, Yang N, Xu RM Nat Struct Mol Biol. 2013 Aug 11. doi: 10.1038/nsmb.2637. PMID:23934152 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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