4av6 | pdb_00004av6

Crystal structure of Thermotoga maritima sodium pumping membrane integral pyrophosphatase at 4 A in complex with phosphate and magnesium

spinqualitylabelsall models 4av6, resolution 4.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4av6 is a 2 chain structure with sequence from Thermotoga maritima. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: K, MG, PO4 Related: 4av3 Activity: Inorganic diphosphatase, with EC number 3.6.1.1 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Membrane-integral pyrophosphatases (M-PPases) are crucial for the survival of plants, bacteria, and protozoan parasites. They couple pyrophosphate hydrolysis or synthesis to Na(+) or H(+) pumping. The 2.6-angstrom structure of Thermotoga maritima M-PPase in the resting state reveals a previously unknown solution for ion pumping. The hydrolytic center, 20 angstroms above the membrane, is coupled to the gate formed by the conserved Asp(243), Glu(246), and Lys(707) by an unusual "coupling funnel" of six alpha helices. Comparison with our 4.0-angstrom resolution structure of the product complex suggests that helix 12 slides down upon substrate binding to open the gate by a simple binding-change mechanism. Below the gate, four helices form the exit channel. Superimposing helices 3 to 6, 9 to 12, and 13 to 16 suggests that M-PPases arose through gene triplication. The structure and catalytic cycle of a sodium-pumping pyrophosphatase.,Kellosalo J, Kajander T, Kogan K, Pokharel K, Goldman A Science. 2012 Jul 27;337(6093):473-6. PMID:22837527 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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