The Fo membrane domain of the F1Fo-ATP synthase complex has been purified from bovine heart mitochondria. The purification procedure involves the removal of peripheral membrane proteins, including F1-ATPase, from submitochondrial particles with guanidine hydrochloride, followed by extraction of Fo and other membrane proteins from the stripped membranes in the presence of the detergent n-dodecyl beta-D-maltoside. Fo was then purified by ion-exchange and dye ligand chromatography in the presence of the same detergent. Approximately 15 mg of pure Fo was recovered from 1.8 g of mitochondrial membrane protein. The purified Fo is a complex of nine different polypeptides. They are subunits a, b, c, d, e, F6, and A6L characterized before in F1Fo-ATPase preparations, and two new hitherto undetected subunits, named f and g. The sequences of subunits f and g have been determined. They are not related significantly to any known protein, but subunit f appears to contain a membrane-spanning alpha-helix. Proteins f and g are also present in approximately stoichiometric amounts in a highly purified preparation of intact F1Fo-ATPase, and so it is concluded that they are authentic subunits of the bovine enzyme with unknown functions. Dibutyltin 3-hydroxyflavone, an inhibitor of F1Fo-ATPase, also binds to the purified Fo in detergent and competes for binding with venturicidin. In the presence of F1 and OSCP, the purified Fo was reassembled into the intact F1Fo-ATPase complex. Therefore, this procedure provides a relatively abundant source of pure and functional Fo that is suitable for structural analysis.
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| rdf:type | |
| rdfs:comment |
The Fo membrane domain of the F1Fo-ATP synthase complex has been purified from bovine heart mitochondria. The purification procedure involves the removal of peripheral membrane proteins, including F1-ATPase, from submitochondrial particles with guanidine hydrochloride, followed by extraction of Fo and other membrane proteins from the stripped membranes in the presence of the detergent n-dodecyl beta-D-maltoside. Fo was then purified by ion-exchange and dye ligand chromatography in the presence of the same detergent. Approximately 15 mg of pure Fo was recovered from 1.8 g of mitochondrial membrane protein. The purified Fo is a complex of nine different polypeptides. They are subunits a, b, c, d, e, F6, and A6L characterized before in F1Fo-ATPase preparations, and two new hitherto undetected subunits, named f and g. The sequences of subunits f and g have been determined. They are not related significantly to any known protein, but subunit f appears to contain a membrane-spanning alpha-helix. Proteins f and g are also present in approximately stoichiometric amounts in a highly purified preparation of intact F1Fo-ATPase, and so it is concluded that they are authentic subunits of the bovine enzyme with unknown functions. Dibutyltin 3-hydroxyflavone, an inhibitor of F1Fo-ATPase, also binds to the purified Fo in detergent and competes for binding with venturicidin. In the presence of F1 and OSCP, the purified Fo was reassembled into the intact F1Fo-ATPase complex. Therefore, this procedure provides a relatively abundant source of pure and functional Fo that is suitable for structural analysis.
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| skos:exactMatch | |
| uniprot:name |
Biochemistry
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| uniprot:author |
Buchanan S.K.,
Collinson I.R.,
Fearnley I.M.,
Griffiths D.E.,
Runswick M.J.,
Skehel J.M.,
Walker J.E.,
van Raaij M.J.
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| uniprot:date |
1994
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| uniprot:pages |
7971-7978
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| uniprot:title |
F0 membrane domain of ATP synthase from bovine heart mitochondria: purification, subunit composition, and reconstitution with F1-ATPase.
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| uniprot:volume |
33
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| dc-term:identifier |
doi:10.1021/bi00191a026
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