title: The assembly factor Atp11p binds to the beta-subunit of the mitochondrial F(1)-ATPase.
abstract: Atp11p is a protein of Saccharomyces cerevisiae required for the assembly of the F(1) component of the mitochondrial F(1)F(0)-ATP synthase. This study presents evidence that Atp11p binds selectively to the beta-subunit of F(1). Under conditions in which avidin-Sepharose beads specifically adsorbed biotinylated Atp11p from yeast mitochondrial extracts, the F(1) beta-subunit coprecipitated with the tagged Atp11p protein. Binding interactions between Atp11p and the entire beta-subunit of F(1) or fragments of the beta-subunit were also revealed by a yeast two-hybrid screen: Atp11p bound to a region of the nucleotide-binding domain of the beta-subunit located between Gly(114) and Leu(318). Certain elements of this sequence that would be accessible to Atp11p in the free beta-subunit make contact with adjacent alpha-subunits in the assembled enzyme. This observation suggests that the alpha-subunits may exchange for bound Atp11p during the process of F(1) assembly.
authors.affiliation: Department of Surgery, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.
authors.forename: Z G
authors.initials: ZG
authors.lastname: Wang
authors.forename: S H
authors.initials: SH
authors.lastname: Ackerman
mesh_terms: D000818:Animals; D001665:Binding Sites; D002417:Cattle; D005656:Fungal Proteins / Q000737:chemistry / Q000378:metabolism*; D008928:Mitochondria / Q000201:enzymology*; D025261:Mitochondrial Proton-Translocating ATPases; D008958:Models, Molecular; D018832:Molecular Chaperones; D010957:Plasmids; D011485:Protein Binding; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D006180:Proton-Translocating ATPases / Q000737:chemistry / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; D014170:Transformation, Genetic; D020798:Two-Hybrid System Techniques
chemical_list: C434343:Atp11 protein, S pombe; D005656:Fungal Proteins; D018832:Molecular Chaperones; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; C098664:ATP11 protein, S cerevisiae; D025261:Mitochondrial Proton-Translocating ATPases; D006180:Proton-Translocating ATPases