2bo5 | pdb_00002bo5

File:2bo5.gif

BOVINE OLIGOMYCIN SENSITIVITY CONFERRAL PROTEIN N-TERMINAL DOMAIN

Overview

The peripheral stalk of ATP synthase holds the alpha3beta3 catalytic subcomplex stationary against the torque of the rotating central stalk. In bovine mitochondria, the N-terminal domain of the oligomycin sensitivity conferral protein (OSCP-NT; residues 1-120) anchors one end of the peripheral stalk to the N-terminal tails of one or more alpha-subunits of the F1 subcomplex. Here we present the solution structure of OSCP-NT and an NMR titration study of its interaction with peptides representing N-terminal tails of F1 alpha-subunits. The structure comprises a bundle of six alpha-helices, and its interaction site contains adjoining hydrophobic surfaces of helices 1 and 5; residues in the region 1-8 of the alpha-subunit are essential for the interaction. The OSCP-NT is similar to the N-terminal domain of the delta-subunit from Escherichia coli ATP synthase (delta-NT), except that their surface charges differ (basic and acidic, respectively). As the charges of the adjacent crown regions in their alpha3beta3 complexes are similar, the OSCP-NT and delta-NT probably do not contact the crowns extensively. The N-terminal tails of alpha-subunit tails are probably alpha-helical, and so this interface, which is essential for the rotary mechanism of the enzyme, appears to consist of helix-helix interactions.

About this Structure

2BO5 is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.

Reference

Structure of the F1-binding domain of the stator of bovine F1Fo-ATPase and how it binds an alpha-subunit., Carbajo RJ, Kellas FA, Runswick MJ, Montgomery MG, Walker JE, Neuhaus D, J Mol Biol. 2005 Aug 26;351(4):824-38. PMID:16045926 Page seeded by OCA on Sat May 3 20:33:35 2008

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