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Glycine at position 9 is replaced by aspartic acid in the mutant b-subunit of Escherichia coli F1F0-ATPase coded for by the uncF476 allele. The mutant b-subunit is not assembled into the membrane in haploid strains carrying the uncF476 allele, but, if the mutant allele is incorporated into a multicopy plasmid, then some assembly of the mutant b-subunit occurs. Two revertant strains were characterized, one of which (AN2030) was a full revertant, the other (AN1953) a partial revertant. DNA sequencing indicated that in strain AN2030 the uncF476 mutation had reverted to give the sequence found in the normal uncF gene. The partial-revertant strain AN1953, however, retained the DNA sequence of the uncF476 allele, and complementation analysis indicated that the second mutation may be in the uncA gene. Membranes prepared from the partial-revertant strain carried out oxidative phosphorylation, although the membranes appeared to be impermeable to protons, and the ATPase activity was sensitive to the inhibitor dicyclohexylcarbodi-imide.

biochemical journal

An additional acidic residue in the membrane portion of the <i>b</i>-subunit of the energy-transducing adenosine triphosphatase of <i>Escherichia coli</i> affects both assembly and function

An additional acidic residue in the membrane portion of the b-subunit of the energy-transducing adenosine triphosphatase of Escherichia coli affects both assembly and function