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1l2p
From Proteopedia
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'''ATP Synthase b Subunit Dimerization Domain''' | '''ATP Synthase b Subunit Dimerization Domain''' | ||
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[[Category: Rizzo, P A.Del.]] | [[Category: Rizzo, P A.Del.]] | ||
[[Category: Shilton, B H.]] | [[Category: Shilton, B H.]] | ||
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Revision as of 20:28, 2 May 2008
ATP Synthase b Subunit Dimerization Domain
Overview
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.
About this Structure
1L2P is a Single protein structure of sequence from Escherichia coli. The following page contains interesting information on the relation of 1L2P with [ATP Synthase]. Full crystallographic information is available from OCA.
Reference
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 Page seeded by OCA on Fri May 2 23:28:27 2008
