7bvv

Crystal structure of sulfonic peroxiredoxin Ahp1 in complex with thioredoxin Trx2

spinqualitylabelsall models 7bvv, resolution 2.12Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7bvv is a 2 chain structure with sequence from Saccharomyces cerevisiae S288C. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.12Å Ligands: OCS Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function AHP1_YEAST Thiol-specific antioxidant protein with alkyl hydroperoxidase activity. Involved in osmotic stress resistance and detoxification of the cell. Preferentially eliminates organic peroxides rather than H(2)O(2). Involved in cellular Mn(2+) homeostasis. Publication Abstract from PubMed Peroxiredoxin (Prx) is a thiol-based peroxidase that eliminates reactive oxygen species to avoid oxidative damage. Alkyl hydroperoxide reductase Ahp1 is a novel and specific typical 2-cysteine Prx. Here, we present the crystal structure of sulfonic Ahp1 complexed with thioredoxin Trx2 at 2.12 A resolution. This structure implies that the transient Ahp1-Trx2 complex during the catalytic cycle already have an ability to decompose the peroxides. Structural analysis reveals that the segment glutamine23-lysine32 juxtaposed to the resolving cysteine (CR) of Ahp1 moves inward to generate a compact structure upon peroxidatic cysteine (CP) overoxidation, resulting in the breakdown of several conserved hydrogen bonds formed by Ahp1-Trx2 complex interaction. Structural comparisons suggest that the structure of sulfonic Ahp1 represents a novel conformation of Ahp1, which can mimic a conformational intermediate between the reduced and oxidized forms. Therefore, this study may provide a new structural insight into the intermediate state in which the segment glutamine23-lysine32 juxtaposed to the cysteine31 (CR) undergoes a conformational change upon cysteine62 (CP) oxidation to prepare for the formation of an intermolecular CP-CR disulfide bond during Ahp1 catalytic cycle. Crystal structure of sulfonic peroxiredoxin Ahp1 in complex with thioredoxin Trx2 mimics a conformational intermediate during the catalytic cycle.,Lian FM, Jiang YL, Yang W, Yang X Int J Biol Macromol. 2020 Jun 9;161:1055-1060. doi:, 10.1016/j.ijbiomac.2020.06.065. PMID:32531362 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Peroxiredoxin 3D structures

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