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A new mutant strain of Escherichia coli in which phosphorylation is uncoupled from electron transport was isolated. A genetic-complementation analysis, using partial diploid strains, showed that the new mutant allele, uncD409, is in a gene distinct from the other previously identified genes uncA, uncB and uncC. A strain carrying the uncd409 allele has no Mg2+ ion-stimulated adenosine triphosphatase activity and is therefore phenotypically similar to strains carrying the uncA401 mutant allele. Complementation between the uncA401 and the uncD409 alleles occurred, as indicated by growth of partial diploid strains on succinate and their growth yields on limiting concentrations of glucose. Complementation was confirmed by using membranes prepared from the above partial diploids. Such membranes were found to have Mg2+-stimulated adenosine triphosphatase activity, ATP-dependent transhydrogenase activity ADP-induced atebrin-fluorescence quenching and low but significant amounts of oxidative phosphorylation.

biochemical journal

Genetic complementation between two mutant unc alleles (unc A401 and unc D409) affecting the F1 portion of the magnesium ion-stimulated adenosine triphosphatase of Escherichia coli K12