Download MendeleyStructure of the F1-binding domain of the stator of bovine F1Fo-ATPase and how it binds an alpha-subunit.
Carbajo, R.J., Kellas, F.A., Runswick, M.J., Montgomery, M.G., Walker, J.E., Neuhaus, D.(2005) J Mol Biol 351: 824-838
- PubMed: 16045926
- DOI: https://doi.org/10.1016/j.jmb.2005.06.012
- Primary Citation of Related Structures:
2BO5 - PubMed Abstract:
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.
Organizational Affiliation:
MRC Dunn Human Nutrition Unit, Hills Road, Cambridge CB2 2XY, UK.
