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Cation Transport in Escherichia coli
Abstract
The intracellular Cl concentration in E. coli has been studied as a function of the Cl concentration in the growth medium and the age of the bacterial culture. The ratio of extracellular to intracellular Cl concentration is shown to be 3.0 in the logarithmic phase and 1.13 in the stationary phase, both ratios being independent of the extracellular Cl concentration. If it may be assumed that Cl is passively distributed in this organism, these results are consistent with a transmembrane P.D. of 29 mv, interior negative, during the logarithmic phase, and 3 mv, interior negative, in the stationary phase.
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Other anions like chloride (Cl−) are more abundant in the cytoplasm (10-100 mM in E. coli), and even low levels of uncontrolled leak would disrupt the membrane potential with catastrophic consequences for processes that rely on the electrical potential.
“Other anions like chloride (Cl−) are more abundant in the cytoplasm (10–100 mM in E. coli(27)), and even low levels of uncontrolled leak would disrupt the membrane potential with catastrophic consequences for processes that rely on the electrical potential, including ATP synthesis, secondary active transport, and motility.”
From Membrane exporters of fluoride ion (2021) · cites this paper as [27]
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Membrane exporters of fluoride ion
McIlwain, B. C., Ruprecht, M. T., & Stockbridge, R. B. (2021) · Annual Review of Biochemistry · doi:10.1146/annurev-biochem-071520-112507 · Cited by 69
Metadata
- Authors
- Schultz, S. G., Wilson, N. L., & Epstein, W.
- Affiliations
- From the Biophysical Laboratory, Harvard Medical School, Boston
- Venue
- The Journal of General Physiology
- Publisher
- Rockefeller University Press
- Published
- 1962-09-01
- Volume
- 46
- Issue
- 1
- Pages
- 159-166
- ISSN
- 1540-7748
- 0022-1295
- PMC
- PMC2195246
- Cited by
- 67
- References
- 0
- Language
- en
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