PMID:9614129
| Citation |
McLachlin, DT, Bestard, JA and Dunn, SD (1998) The b and delta subunits of the Escherichia coli ATP synthase interact via residues in their C-terminal regions. J. Biol. Chem. 273:15162-8 |
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| Abstract |
An affinity resin for the F1 sector of the Escherichia coli ATP synthase was prepared by coupling the b subunit to a solid support through a unique cysteine residue in the N-terminal leader. b24-156, a form of b lacking the N-terminal transmembrane domain, was able to compete with the affinity resin for binding of F1. Truncated forms of b24-156, in which one or four residues from the C terminus were removed, competed poorly for F1 binding, suggesting that these residues play an important role in b-F1 interactions. Sedimentation velocity analytical ultracentrifugation revealed that removal of these C-terminal residues from b24-156 resulted in a disruption of its association with the purified delta subunit of the enzyme. To determine whether these residues interact directly with delta, cysteine residues were introduced at various C-terminal positions of b and modified with the heterobifunctional cross-linker benzophenone-4-maleimide. Cross-links between b and delta were obtained when the reagent was incorporated at positions 155 and 158 (two residues beyond the normal C terminus) in both the reconstituted b24-156-F1 complex and the membrane-bound F1F0 complex. CNBr digestion followed by peptide sequencing showed the site of cross-linking within the 177-residue delta subunit to be C-terminal to residue 148, possibly at Met-158. These results indicate that the b and delta subunits interact via their C-terminal regions and that this interaction is instrumental in the binding of the F1 sector to the b subunit of F0. |
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| Keywords |
ATP Synthetase Complexes; Bacterial Proteins/metabolism; Benzophenones/metabolism; Binding, Competitive; Chromatography, Affinity; Cross-Linking Reagents/metabolism; Cyanogen Bromide/metabolism; Escherichia coli/enzymology; Maleimides/metabolism; Multienzyme Complexes/chemistry; Peptide Fragments/chemistry; Phosphotransferases (Phosphate Group Acceptor)/chemistry; Protein Binding; Sequence Analysis; Ultracentrifugation |
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