6rvh

NADH-dependent Coenzyme A Disulfide Reductase soaked with Menadione

spinqualitylabelsall models 6rvh, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6rvh is a 4 chain structure with sequence from Thermus thermophilus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3Å Ligands: COA, FAD, VK3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q72HK3_THET2 Publication Abstract from PubMed The crystal structure of the enzyme previously characterized as a type-2 NADH:menaquinone oxidoreductase (NDH-2) from Thermus thermophilus has been solved at a resolution of 2.9A and revealed that this protein is, in fact, a coenzyme A-disulfide reductase (CoADR). Coenzyme A (CoASH) replaces glutathione as the major low molecular weight thiol in Thermus thermophilus and is maintained in the reduced state by this enzyme (CoADR). Although the enzyme does exhibit NADH:menadione oxidoreductase activity expected for NDH-2 enzymes, the specific activity with CoAD as an electron acceptor is about 5-fold higher than with menadione. Furthermore, the crystal structure contains coenzyme A covalently linked Cys44, a catalytic intermediate (Cys44-S-S-CoA) reduced by NADH via the FAD cofactor. Soaking the crystals with menadione shows that menadione can bind to a site near the redox active FAD, consistent with the observed NADH:menadione oxidoreductase activity. CoADRs from other species were also examined and shown to have measurable NADH:menadione oxidoreductase activity. Although a common feature of this family of enzymes, no biological relevance is proposed. The CoADR from T. thermophilus is a soluble homodimeric enzyme. Expression of the recombinant TtCoADR at high levels in E. coli results in a small fraction that co-purifies with the membrane fraction, which was used previously to isolate the enzyme wrongly identified as a membrane-bound NDH-2. It is concluded that T. thermophilus does not contain an authentic NDH-2 component in its aerobic respiratory chain. Characterization and X-ray structure of the NADH-dependent coenzyme A disulfide reductase from Thermus thermophilus.,Lencina AM, Koepke J, Preu J, Muenke C, Gennis RB, Michel H, Schurig-Briccio LA Biochim Biophys Acta Bioenerg. 2019 Sep 11;1860(11):148080. doi:, 10.1016/j.bbabio.2019.148080. PMID:31520616 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Coenzyme A-Disulfide Reductase

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