1l2p

ATP Synthase b Subunit Dimerization Domain

spinqualitylabelsall models 1l2p, resolution 1.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1l2p is a 1 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. The December 2005 RCSB PDB Molecule of the Month feature on ATP Synthase by David S. Goodsell is 10.2210/rcsb_pdb/mom_2005_12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Activity: Iron-chelate-transporting ATPase, with EC number 3.6.3.34 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [ATPF_ECOLI] F(1)F(0) ATP synthase produces ATP from ADP in the presence of a proton or sodium gradient. F-type ATPases consist of two structural domains, F(1) containing the extramembraneous catalytic core and F(0) containing the membrane proton channel, linked together by a central stalk and a peripheral stalk. During catalysis, ATP synthesis in the catalytic domain of F(1) is coupled via a rotary mechanism of the central stalk subunits to proton translocation (By similarity). Component of the F(0) channel, it forms part of the peripheral stalk, linking F(1) to F(0) (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The b subunit of E. coli F(0)F(1)-ATPase links the peripheral F(1) subunits to the membrane-integral F(0) portion and functions as a "stator", preventing rotation of F(1). The b subunit is present as a dimer in ATP synthase, and residues 62-122 are required to mediate dimerization. To understand how the b subunit dimer is formed, we have studied the structure of the isolated dimerization domain, b(62-122). Analytical ultracentrifugation and solution small-angle X-ray scattering (SAXS) indicate that the b(62-122) dimer is extremely elongated, with a frictional ratio of 1.60, a maximal dimension of 95 A, and a radius of gyration of 27 A, values that are consistent with an alpha-helical coiled-coil structure. The crystal structure of b(62-122) has been solved and refined to 1.55 A. The protein crystallized as an isolated, monomeric alpha helix with a length of 90 A. Combining the crystal structure of monomeric b(62-122) with SAXS data from the dimer in solution, we have constructed a model for the b(62-122) dimer in which the two helices form a coiled coil with a right-handed superhelical twist. Analysis of b sequences from E. coli and other prokaryotes indicates conservation of an undecad repeat, which is characteristic of a right-handed coiled coil and consistent with our structural model. Mutation of residue Arg-83, which interrupts the undecad pattern, to alanine markedly stabilized the dimer, as expected for the proposed two-stranded, right-handed coiled-coil structure. The "second stalk" of Escherichia coli ATP synthase: structure of the isolated dimerization domain.,Del Rizzo PA, Bi Y, Dunn SD, Shilton BH Biochemistry. 2002 May 28;41(21):6875-84. PMID:12022893 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also ATPase 3D structures

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