4p2l | pdb_00004p2l

Quiescin Sulfhydryl Oxidase from Rattus norvegicus

spinqualitylabelsall models 4p2l, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4p2l is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FAD Related: 3t58, 3q6o, 3llk, 3qcp Activity: Thiol oxidase, with EC number 1.8.3.2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [QSOX1_RAT] Catalyzes the oxidation of sulfhydryl groups in peptide and protein thiols to disulfides with the reduction of oxygen to hydrogen peroxide. May contribute to disulfide bond formation in a variety of secreted proteins. Publication Abstract from PubMed Thioredoxin superfamily proteins introduce disulfide bonds into substrates, catalyze the removal of disulfides, and operate in electron relays. These functions rely on one or more dithiol/disulfide exchange reactions. The flavoenzyme quiescin sulfhydryl oxidase (QSOX), a catalyst of disulfide bond formation with an interdomain electron transfer step in its catalytic cycle, provides a unique opportunity for exploring the structural environment of enzymatic dithiol/disulfide exchange. Wild-type Rattus norvegicus QSOX1 (RnQSOX1) was crystallized in a conformation that juxtaposes the two redox-active di-cysteine motifs in the enzyme, presenting the entire electron-transfer pathway and proton-transfer participants in their native configurations. As such a state cannot generally be enriched and stabilized for analysis, RnQSOX1 gives unprecedented insight into the functional group environments of the four cysteines involved in dithiol/disulfide exchange and provides the framework for analysis of the energetics of electron transfer in the presence of the bound flavin adenine dinucleotide cofactor. Hybrid quantum mechanics/molecular mechanics (QM/MM) free energy simulations based on the X-ray crystal structure suggest that formation of the interdomain disulfide intermediate is highly favorable and secures the flexible enzyme in a state from which further electron transfer via the flavin can occur. Enzyme structure captures four cysteines aligned for disulfide relay.,Gat Y, Vardi-Kilshtain A, Grossman I, Major DT, Fass D Protein Sci. 2014 Jun 3. doi: 10.1002/pro.2496. PMID:24888638 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Sulfhydryl oxidase

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