3q33

Structure of the Rtt109-AcCoA/Vps75 Complex and Implications for Chaperone-Mediated Histone Acetylation

spinqualitylabelsall models 3q33, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3q33 is a 3 chain structure with sequence from Saccharomyces cerevisiae and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Ligands: ACO, ALY, EDO, NH2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RT109_YEAST Required for acetylation of 'Lys-56' of histone H3 (H3K56ac) which occurs in S phase and disappears during G(2)/M phase of the cell cycle and is involved in transcription DNA repair process. H3K56 acetylation weakens of the interaction between the histone core and the surrounding DNA in the nucleosomal particle and drives chromatin disassembly. Involved in regulation of Ty1 transposition. Publication Abstract from PubMed Yeast Rtt109 promotes nucleosome assembly and genome stability by acetylating K9, K27, and K56 of histone H3 through interaction with either of two distinct histone chaperones, Vps75 or Asf1. We report the crystal structure of an Rtt109-AcCoA/Vps75 complex revealing an elongated Vps75 homodimer bound to two globular Rtt109 molecules to form a symmetrical holoenzyme with a approximately 12 A diameter central hole. Vps75 and Rtt109 residues that mediate complex formation in the crystals are also important for Rtt109-Vps75 interaction and H3K9/K27 acetylation both in vitro and in yeast cells. The same Rtt109 residues do not participate in Asf1-mediated Rtt109 acetylation in vitro or H3K56 acetylation in yeast cells, demonstrating that Asf1 and Vps75 dictate Rtt109 substrate specificity through distinct mechanisms. These studies also suggest that Vps75 binding stimulates Rtt109 catalytic activity by appropriately presenting the H3-H4 substrate within the central cavity of the holoenzyme to promote H3K9/K27 acetylation of new histones before deposition. Structure of the Rtt109-AcCoA/Vps75 Complex and Implications for Chaperone-Mediated Histone Acetylation.,Tang Y, Holbert MA, Delgoshaie N, Wurtele H, Guillemette B, Meeth K, Yuan H, Drogaris P, Lee EH, Durette C, Thibault P, Verreault A, Cole PA, Marmorstein R Structure. 2011 Feb 9;19(2):221-31. Epub 2011 Jan 20. PMID:21256037 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Histone acetyltransferase 3D structures Vacuolar protein sorting-associated protein 3D structures

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