5uni

Critical role of water molecules for proton translocation of the membrane-bound transhydrogenase

spinqualitylabelsall models 5uni, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5uni is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 1PE, BEN, OLC, PEG Activity: NAD(P)(+) transhydrogenase (Re/Si-specific), with EC number 1.6.1.2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [Q72GS0_THET2] The transhydrogenation between NADH and NADP is coupled to respiration and ATP hydrolysis and functions as a proton pump across the membrane (By similarity).[PIRNR:PIRNR000204] Publication Abstract from PubMed The nicotinamide nucleotide transhydrogenase (TH) is an integral membrane enzyme that uses the proton-motive force to drive hydride transfer from NADH to NADP+ in bacteria and eukaryotes. Here we solved a 2.2-A crystal structure of the TH transmembrane domain (Thermus thermophilus) at pH 6.5. This structure exhibits conformational changes of helix positions from a previous structure solved at pH 8.5, and reveals internal water molecules interacting with residues implicated in proton translocation. Together with molecular dynamics simulations, we show that transient water flows across a narrow pore and a hydrophobic "dry" region in the middle of the membrane channel, with key residues His42alpha2 (chain A) being protonated and Thr214beta (chain B) displaying a conformational change, respectively, to gate the channel access to both cytoplasmic and periplasmic chambers. Mutation of Thr214beta to Ala deactivated the enzyme. These data provide new insights into the gating mechanism of proton translocation in TH. Critical Role of Water Molecules in Proton Translocation by the Membrane-Bound Transhydrogenase.,Padayatti PS, Leung JH, Mahinthichaichan P, Tajkhorshid E, Ishchenko A, Cherezov V, Soltis SM, Jackson JB, Stout CD, Gennis RB, Zhang Q Structure. 2017 Jul 5;25(7):1111-1119.e3. doi: 10.1016/j.str.2017.05.022. Epub, 2017 Jun 22. PMID:28648609 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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