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. 1979 Apr 15;180(1):111–118. doi: 10.1042/bj1800111

Properties of membranes from mutant strains of Escherichia coli in which the beta-subunit of the adenosine triphosphatase is abnormal.

A E Senior, D R Fayle, J A Downie, F Gibson, G B Cox
PMCID: PMC1161025  PMID: 158358

Abstract

Five uncoupled mutant strains of Escherichia coli carrying mutations in the uncD gene have been studied. In each of these mutant strains the beta-subunit of the F1 portion of the membrane-bound adenosine triphosphatase is abnormal. In one of the mutant strains (carrying the uncD12 allele) in F1-ATPase aggregate was formed which was purified and found to have low ATPase activity. ATPase activity was absent in the other four strains and the abnormal beta-subunits were tightly bound to the membranes. However, membranes from these strains exhibited various proton permeabilities as indicated by NADH-dependent atebrin-fluorescence quenching and bound different amounts of normal F1-ATPase. The amounts of reconstitution of energy-linked reactions after the addition of normal F1-ATPase also varied depending on the mutant allele. It is apparent that considerable phenotypic variations can occur between strains carrying mutations in the same unc gene.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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