Reference: Soubannier V, et al. (1999) The second stalk of the yeast ATP synthase complex: identification of subunits showing cross-links with known positions of subunit 4 (subunit b). Biochemistry 38(45):15017-24

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Abstract


A component of the stator of the yeast ATP synthase (subunit 4 or b) showed many cross-linked products with the homobifunctional reagent dithiobis[succinimidyl propionate], which reacts with the amino group of lysine residues. The positions in subunit 4 that were involved in the cross-linkings were determined by using cysteine-generated mutants constructed by site-directed mutagenesis of ATP4. Cross-linking experiments with the heterobifunctional reagent p-azidophenacyl bromide, which has a spacer arm of 9 A, were performed with mitochondria and crude Triton X-100 extracts containing the solubilized enzyme. Substitution of lysine residues by cysteine residues in the hydrophilic C-terminal part of subunit 4 allowed cross-links with subunit h from C98 and with subunit d from C141, C143, and C151. OSCP was cross-linked from C174 and C209. A cross-linked product, 4+beta, was also obtained from C174. It is concluded that the C-terminus of subunit 4 is distant from the membrane surface and close to F(1) and OSCP. The N-terminal part of subunit 4 is close to subunit g, as demonstrated by the identification of a cross-linked product involving subunit g and the cysteine residues 7 or 14 of subunit 4.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Soubannier V, Rusconi F, Vaillier J, Arselin G, Chaignepain S, Graves PV, Schmitter JM, Zhang JL, Mueller D, Velours J
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