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Article

pH dependence of the function of sodium ion extrusion systems in Escherichia coli.

Biochimica et biophysica acta - 25 Mar 1998

Sakuma T, Yamada N, Saito H, Kakegawa T, Kobayashi H

Abstract excerpt

Escherichia coli has three systems for sodium ion extrusion, NhaA, NhaB and ChaA. In this study, we examined the effect of pH on the function of these transporters using mutants having one of them, and found that (1) a mutant having NhaB excreted sodium ions at pH 7.5 but not at pH 8.5, (2) the efflux of sodium ions from mutant cells having ChaA was observed at both pH 7.5 and 8.5, but the activity was lower at...

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Identifiers

PMID: 9518629
DOI: 10.1016/s0005-2728(97)00102-3

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PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 7 Sept 2026. Manifest publication-graph-cohort-2026-09-08.1.

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Research trail→

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pH dependence of the function of sodium ion extrusion systems in Escherichia coli.PMID 9518629Read ↗

The NhaB Na+/H+ antiporter is essential for intracellular pH regulation under alkaline conditions in Escherichia coli.Semantic proximity Read ↗

Physiological role of the chaA gene in sodium and calcium circulations at a high pH in Escherichia coli.Semantic proximity Read ↗

Escherichia coli is able to grow with negligible sodium ion extrusion activity at alkaline pH.Semantic proximity Read ↗

Diversities and similarities in pH dependency among bacterial NhaB-like Na+/H+ antiporters.Semantic proximity Read ↗

Glutamate 85 is involved in the sodium/proton exchange activity of the Escherichia coli ChaA.Semantic proximity Read ↗

Trans membrane domain IV is involved in ion transport activity and pH regulation of the NhaA-Na(+)/H(+) antiporter of Escherichia coli.Semantic proximity Read ↗

NhaA of Escherichia coli, as a model of a pH-regulated Na+/H+antiporter.Semantic proximity Read ↗

Regulation of NhaA by protons.Semantic proximity Read ↗

Transmembrane segment II of NhaA Na+/H+ antiporter lines the cation passage, and Asp65 is critical for pH activation of the antiporter.Semantic proximity Read ↗

The Na+ and K+ transport deficiency of an E. coli mutant lacking the NhaA and NhaB proteins is apparent and caused by impaired osmoregulation.Semantic proximity Read ↗

pH-dependent growth retardation of Escherichia coli caused by overproduction of Na+/H+ antiporter.Semantic proximity Read ↗

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