3vsc

Crystal Structure of the K127A Mutant of O-Phosphoserine Sulfhydrylase Complexed with External Schiff Base of Pyridoxal 5'-Phosphate with O-Phospho-L-Serine

spinqualitylabelsall models 3vsc, resolution 2.07Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3vsc is a 2 chain structure with sequence from Aeropyrum pernix. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MPD, PLP, SEP Related: 1wkv, 3vsa, 3vsd Gene: APE1586, APE_1586, cysO (Aeropyrum pernix) Resources: FirstGlance, OCA, RCSB, PDBsum Function [CYSO_AERPE] Cysteine synthase that can also catalyze the synthesis of S-sulfo-L-cysteine from thiosulfate and O(3)-acetyl-L-serine, as well as the sulfhydrylation of L-serine by sulfide. Publication Abstract from PubMed O-Phosphoserine sulfhydrylase is a new enzyme found in a hyperthermophilic archaeon, Aeropyrum pernix K1. This enzyme catalyzes a novel cysteine synthetic reaction from O-phospho-l-serine and sulfide. The crystal structure of the enzyme was determined at 2.0A resolution using the method of multi-wavelength anomalous dispersion. A monomer consists of three domains, including an N-terminal domain with a new alpha/beta fold. The topology folds of the middle and C-terminal domains were similar to those of the O-acetylserine sulfhydrylase-A from Salmonella typhimurium and the cystathionine beta-synthase from human. The cofactor, pyridoxal 5'-phosphate, is bound in a cleft between the middle and C-terminal domains through a covalent linkage to Lys127. Based on the structure determined, O-phospho-l-serine could be rationally modeled into the active site of the enzyme. An enzyme-substrate complex model and a mutation experiment revealed that Arg297, unique to hyperthermophilic archaea, is one of the most crucial residues for O-phosphoserine sulfhydrylation activity. There are more hydrophobic areas and less electric charges at the dimer interface, compared to the S.typhimurium O-acetylserine sulfhydrylase. Three-dimensional structure of a new enzyme, O-phosphoserine sulfhydrylase, involved in l-cysteine biosynthesis by a hyperthermophilic archaeon, Aeropyrum pernix K1, at 2.0A resolution.,Oda Y, Mino K, Ishikawa K, Ataka M J Mol Biol. 2005 Aug 12;351(2):334-44. PMID:16005886 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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