The epsilon subunit as an ATPase inhibitor of the F1-ATPase in Escherichia coli |
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Authors: | G Dreyfus M Satre |
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Affiliation: | Laboratoire de Biochimie (CNRS/ERA 903 et INSERM U.191), Département de Recherche Fondamentale, CEN-G 85 X, 38041 Grenoble, France |
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Abstract: | The isolation of protein ATPase inhibitor was attempted directly from Escherichia coli membrane extracts to examine the possible presence of a Pullman-Monroy-type inhibitor [M. E. Pullman and G. C. Monroy (1963) J. Biol. Chem. 238, 3762-3769] distinct from the epsilon subunit of E. coli ATPase. Purification to homogeneity was achieved in a sequence of steps involving trichloracetic acid precipitation, DEAE-cellulose, Sephadex G75 chromatography, and a terminal isoelectric focusing step. An inhibitory protein was obtained and was identified by its physicochemical and inhibitory properties as the epsilon subunit of E. coli ATPase. The other inhibitory fraction observed in the purification procedure consisted of aggregated epsilon subunits. |
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Keywords: | To whom correspondence should be addressed: Centro de Investigaciones en Fisiologia Celular Universidad Nacional Autónoma de Mexico Apartado Postal 70-600 04510 Mexico DF Mexico. |
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