4r3l

Crystal structure of Ard1 N-terminal acetyltransferase from Sulfolobus solfataricus bound to substrate peptide fragment and CoA

spinqualitylabelsall models 4r3l, resolution 1.84Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4r3l is a 2 chain structure with sequence from Saccharolobus solfataricus and Saccharolobus solfataricus P2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.839Å Ligands: COA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NAT_SACS2 Displays alpha (N-terminal) acetyltransferase activity. Catalyzes the covalent attachment of an acetyl moiety from acetyl-CoA to the free alpha-amino group at the N-terminus of a protein (PubMed:17511810, PubMed:23959863, PubMed:25728374). NAT is able to acetylate the alpha-amino group of methionine, alanine and serine N-terminal residue substrates, however it has a preference for Ser-N-terminal substrates (PubMed:17511810, PubMed:23959863, PubMed:25728374). Publication Abstract from PubMed Nalpha-acetyltransferases (Nats) possess a wide range of important biological functions. Their structures can vary according to the first two residues of their substrate. However, the mechanisms of substrate recognition and catalysis of Nats are elusive. Here, we present two structure of Sulfolobus solfataricus Ard1 (SsArd1), a member of the NatA family, at 2.13 and 1.84 A. Both structures contain coenzyme A, while the latter also contains a substrate-derived peptide. Sequential structure-based mutagenesis revealed that mutations of critical residues for CoA binding decreased the binding affinity of SsArd1 by 3 ~ 7-fold. Superimposition of SsArd1 (NatA) with human Naa50p (NatE) showed significant differences in key residues of enzymes near the first amino-acid position of the substrate peptide (Glu35 for SsArd1 and Val29 for Naa50p). Further enzyme activity assays revealed that the substrate specificity of SsArd1 could be altered from SSGTPT to MEEKVG by a range of Glu35 mutants. These studies provide not only a molecular elucidation of substrate recognition and specificity for the NatA family, but also insight into how members of the NAT family distinguish between amino acids at the substrate N-terminus from the ancient monomeric archaeal Ard1. Structural Basis for Substrate-specific Acetylation of Nalpha-acetyltransferase Ard1 from Sulfolobus solfataricus.,Chang YY, Hsu CH Sci Rep. 2015 Mar 2;5:8673. doi: 10.1038/srep08673. PMID:25728374 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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