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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Influence of the alpha-, beta- and gamma-subunits of the energy-transducing adenosine triphosphates from Micrococcus lysodeikticus in the immunochemical properties of the protein and in their reconstitution studied by a radioimmunoassay method.

We developed a sensitive and specific radioimmunoassay of the energy-transducing adenosine triphosphatase (F1-ATPase, EC of Micrococcus lysodeikticus and extended the assay to the alpha-, beta- and gamma-subunits of the enzyme. We isolated these subunits and studied cross-reactions. We found the immunochemical properties of alpha- and beta-subunits to differ, and gamma-subunits showed an intermediate behaviour between that of alpha- and beta-subunits. Our findings indicate that each subunit of M. lysodeikticus F1-ATPase has its own identity and that conformational antigenic determinants and/or co-operative antigenic sites-arise from subunit assembly. Equimolecular amounts of alpha- and beta-subunits (up to three copies of each) reconstituted partially the immunochemical properties of the ATPase molecule, and addition of 2 mol of gamma-subunit per mol of alpha 3 beta 3 complex improved reconstitution. Our findings describe the first reconstitution of biological activity of this ATPase by assembly of the isolated subunits, and provide support for earlier proposals on the stoicheiometry of the alpha 3 beta 3 gamma 2 type for M. lysodeikticus F1-ATPase. The radioimmunoassay method affords opportunities to study the homologies between different energy-transducing ATPases and their constituent polypeptides before the primary structure of these complex proteins has been determined.[1]


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