1xob

THIOREDOXIN (REDUCED DITHIO FORM), NMR, 20 STRUCTURES

spinqualitylabelsall models 1xob, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1xob is a 1 chain structure with sequence from Escherichia coli. This structure supersedes the now removed PDB entry 1trx. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, RCSB, PDBsum Function [THIO_ECOLI] Participates in various redox reactions through the reversible oxidation of its active center dithiol to a disulfide and catalyzes dithiol-disulfide exchange reactions. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed BACKGROUND: Thioredoxin participates in thiol-disulfide exchange reactions and both oxidized thioredoxin (disulfide form) and reduced thioredoxin (dithiol form) are found under physiological conditions. Previous structural studies suggested that the two forms were extremely similar, although significant functional and spectroscopic differences exist. We therefore undertook high-resolution solution structural studies of the two forms of Escherichia coli thioredoxin in order to detect subtle conformational differences. RESULTS: The solution structures of reduced and oxidized thioredoxin are extremely similar. Backbone structure is largely identical in the two forms, with slight differences in the region of the active site, which includes Cys32 and Cys35. The side chain sulfur atom of Cys32 is tilted away from that of Cys35 in the reduced form of the protein to accommodate the increase in S-S distance that occurs upon reduction of the disulfide, but the chi 1 angles of the two cysteines remain the same in the two forms. CONCLUSIONS: Only subtle conformational changes occur upon changing the oxidation state of the active site cysteines, including the positions of some side chains and in hydrogen bonding patterns in the active site region. Functional differences between the two forms are probably therefore related to differences in local conformational flexibility in and near the active site loop. High-resolution solution structures of oxidized and reduced Escherichia coli thioredoxin.,Jeng MF, Campbell AP, Begley T, Holmgren A, Case DA, Wright PE, Dyson HJ Structure. 1994 Sep 15;2(9):853-68. PMID:7812718 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Thioredoxin

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