PMID: 10940012Aug 12, 2000Paper

The membrane-bound H(+)-ATPase complex is essential for growth of Lactococcus lactis

Journal of Bacteriology
B J KoebmannP R Jensen

Abstract

The eight genes which encode the (F(1)F(o)) H(+)-ATPase in Lactococcus lactis subsp. cremoris MG1363 were cloned and sequenced. The genes were organized in an operon with the gene order atpEBFHAGDC; i.e., the order of atpE and atpB is reversed with respect to the more typical bacterial organization. The deduced amino acid sequences of the corresponding H(+)-ATPase subunits showed significant homology with the subunits from other organisms. Results of Northern blot analysis showed a transcript at approximately 7 kb, which corresponds to the size of the atp operon. The transcription initiation site was mapped by primer extension and coincided with a standard promoter sequence. In order to analyze the importance of the H(+)-ATPase for L. lactis physiology, a mutant strain was constructed in which the original atp promoter on the chromosome was replaced with an inducible nisin promoter. When grown on GM17 plates the resulting strain was completely dependent on the presence of nisin for growth. These data demonstrate that the H(+)-ATPase is essential for growth of L. lactis under these conditions.

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Related Concepts

Plasma Membrane
DNA, Bacterial
Genes, Bacterial
H(+)-Transporting ATP Synthase, Acyl-Phosphate-Linked
Operon
Lactococcus lactis subsp. lactis
Transcription, Genetic

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