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• W2046975904 startingPage "617" @default.
• W2046975904 abstract "Transhydrogenase (TH) couples direct and stereospecific hydride transfer between NAD(H) and NADP(H), bound within soluble domains I and III, respectively, to proton translocation across membrane bound domain II. The cocrystal structure of Rhodospirillum rubrum TH domains I and III has been determined in the presence of limiting NADH, under conditions in which the subunits reach equilibrium during crystallization. The crystals contain three heterotrimeric complexes, dI2dIII, in the asymmetric unit. Multiple conformations of loops and side-chains, and NAD(H) cofactors, are observed in domain I pertaining to substrate/product exchange, and highlighting electrostatic interactions during the hydride transfer. Two interacting NAD(H)–NADPH pairs are observed where alternate conformations of the NAD(H) phosphodiester and conserved arginine side-chains are correlated. In addition, the stereochemistry of one NAD(H)–NADPH pair approaches that expected for nicotinamide hydride transfer reactions. The cocrystal structure exhibits non-crystallographic symmetry that implies another orientation for domain III, which could occur in dimeric TH. Superposition of the “closed” form of domain III (PDB 1PNO, chain A) onto the dI2dIII complex reveals a severe steric conflict of highly conserved loops in domains I and III. This overlap, and the overlap with a 2-fold related domain III, suggests that motions of loop D within domain III and of the entire domain are correlated during turnover. The results support the concept that proton pumping in TH is driven by the difference in binding affinity for oxidized and reduced nicotinamide cofactors, and in the absence of a difference in redox potential, must occur through conformational effects." @default.
• W2046975904 created "2016-06-24" @default.
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• W2046975904 date "2005-02-01" @default.
• W2046975904 modified "2023-09-25" @default.
• W2046975904 title "Conformational Diversity in NAD(H) and Interacting Transhydrogenase Nicotinamide Nucleotide Binding Domains" @default.
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• W2046975904 doi "https://doi.org/10.1016/j.jmb.2004.11.070" @default.
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