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A model for the regulation of expression of the potassium transport operon kdp in escherichia coli


A model for the regulation of expression of the potassium transport operon kdp in escherichia coli



Journal of Genetics 66(2): 87-92



ISSN/ISBN: 0022-1333

DOI: 10.1007/bf02931654

The intracellular concentration of K+ in Escherichia coli is known to be determined by osmolarity of the growth medium, and it is believed that the expression of the potassium-transport operon, kdp, is controlled by the turgor pressure differential between the cytoplasm and the extracellular environment. Several lines of evidence, however, argue against a strict turgor-regulation model for kdp expression. Instead, it is proposed here that kdp is controlled by one fraction of intracellular [K+], and that the size of this fraction is independnet of the osmolarity of the culture medium.

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Accession: 004587301

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