4o9u

Mechanism of transhydrogenase coupling proton translocation and hydride transfer

spinqualitylabelsall models 4o9u, resolution 6.93Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4o9u is a 6 chain structure with sequence from Thet2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NAD, NAP Gene: TT_C1779 (THET2), TT_C1778 (THET2), TT_C1780 (THET2) 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 NADPH/NADP(+) (the reduced form of NADP(+)/nicotinamide adenine dinucleotide phosphate) homeostasis is critical for countering oxidative stress in cells. Nicotinamide nucleotide transhydrogenase (TH), a membrane enzyme present in both bacteria and mitochondria, couples the proton motive force to the generation of NADPH. We present the 2.8 A crystal structure of the transmembrane proton channel domain of TH from Thermus thermophilus and the 6.9 A crystal structure of the entire enzyme (holo-TH). The membrane domain crystallized as a symmetric dimer, with each protomer containing a putative proton channel. The holo-TH is a highly asymmetric dimer with the NADP(H)-binding domain (dIII) in two different orientations. This unusual arrangement suggests a catalytic mechanism in which the two copies of dIII alternatively function in proton translocation and hydride transfer. Structural biology. Division of labor in transhydrogenase by alternating proton translocation and hydride transfer.,Leung JH, Schurig-Briccio LA, Yamaguchi M, Moeller A, Speir JA, Gennis RB, Stout CD Science. 2015 Jan 9;347(6218):178-81. doi: 10.1126/science.1260451. PMID:25574024 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also NAD(P) transhydrogenase

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