6ag5

Crystal structure of Ard1 N-terminal acetyltransferase E88H/H127E mutant from Sulfolobus solfataricus

spinqualitylabelsall models 6ag5, resolution 2.32Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6ag5 is a 1 chain structure with sequence from 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 2.32Å Ligands: ACO, CA 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 The common mechanism of N-acetyltransferases (NATs) is a water-mediated catalysis, which is not conducive to thermophilic acetyltransferases. The crystal structure of SsArd1 shows an ordered catalytic water molecule in a trap formed by the residues H88 and E127. Structure-guided mutagenesis, kinetic studies and MD simulation indicated that the turnover rates of H88A, E127A and H88A/E127A mutants were low, but that of the H88E/E127H mutant could be restored to the level of the wild type. Adaptation of thermophilic acetyltransferase to a water-mediated catalytic mechanism.,Chang YY, Hagawa S, Hsu CH Chem Commun (Camb). 2020 Sep 10;56(72):10537-10540. doi: 10.1039/d0cc04305b. PMID:32780067 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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