3cz7

Molecular Basis for the Autoregulation of the Protein Acetyl Transferase Rtt109

spinqualitylabelsall models 3cz7, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3cz7 is a 1 chain structure with sequence from Atcc 18824. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACO NonStd Res: ALY, MSE Gene: RTT109, KIM2, REM50 (ATCC 18824) 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. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Rtt109 is a protein acetyltransferase (PAT) that is responsible for the acetylation of lysine-56 of histone 3 (H3K56) in yeast. H3K56 acetylation has been implicated in the weakening of the interaction between the histone core and the surrounding DNA in the nucleosomal particle. Rtt109, in cooperation with various histone chaperones, promotes genomic stability and is required for resistance to DNA damaging agents. Here, we present the crystal structure of Rtt109 in complex with acetyl-CoA at a 2.0-A resolution. Rtt109 consists of a core PAT domain, which binds the acetyl-CoA cofactor. A second domain, the activation domain, is tightly associated with the PAT domain. Autoacetylation of lysine-290 within the activation domain is required for stabilizing the interaction between the two domains and is essential for catalysis. Biochemical analysis demonstrates the requirement of a loop within the PAT domain for the binding of the histone chaperone Vps75, and mutational analysis identifies key residues for catalysis. We propose a model in which the autoacetylation of Rtt109 is crucial for the regulation of its catalytic activity. Molecular basis for the autoregulation of the protein acetyl transferase Rtt109.,Stavropoulos P, Nagy V, Blobel G, Hoelz A Proc Natl Acad Sci U S A. 2008 Aug 26;105(34):12236-41. Epub 2008 Aug 21. PMID:18719104 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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