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

Complementation between uncF alleles affecting assembly of the F1F0-ATPase complex of Escherichia coli.

A mutant affected in the b subunit (coded by the uncF gene) of the F1F0-ATPase in Escherichia coli was isolated by a localized mutagenesis procedure in which a plasmid carrying the unc genes was mutagenized in vivo. The biochemical properties of cells carrying the uncF515 allele were examined in a strain carrying the allele on a multicopy plasmid and a mutator-induced polar unc mutation on the chromosome. The strain carrying the mutant unc allele was uncoupled with respect to oxidative phosphorylation. Membrane-bound ATPase activity was very low or absent, and membranes were somewhat proton permeable. It was concluded that the F0 sector was assembled. Determination of the DNA sequence of the uncF515 allele showed it differed from wild type in that a G----A substitution occurred at position 392, resulting in glycine being replaced by aspartate at position 131. Genetic complementation tests indicated that the uncF515 allele complemented the uncF476 allele (Gly 9----Asp). Two-dimensional gel electrophoresis of membrane preparations indicated that the uncF515 and uncF476 alleles interrupted assembly of the F1F0-ATPase at different stages.[1]


  1. Complementation between uncF alleles affecting assembly of the F1F0-ATPase complex of Escherichia coli. Jans, D.A., Hatch, L., Fimmel, A.L., Gibson, F., Cox, G.B. J. Bacteriol. (1985) [Pubmed]
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