| Potassium transport and the relationship between intracellular potassium concentration and amino acid uptake by cells of a marine pseudomonad. | |
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MedLine Citation:
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PMID: 4455685 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Transport of K(+) by K(+)-depleted cells of marine pseudomonad B-16 (ATCC 19855) exhibited saturation kinetics. Rb(+) inhibited both K(+) transport and the K(+)-dependent transport of alpha-aminoisobutyric acid (AIB) into K(+)-depleted cells of the organism in proportion to the concentration of Rb(+) in the suspending medium. Inhibition of the K(+)-dependent uptake of AIB into K(+)-depleted cells by Rb(+) could be overcome by increasing the concentration of K(+) in the medium. When AIB and K(+) were added simultaneously to a suspension of K(+)-depleted cells, the uptake of K(+) occurred immediately and rapidly, whereas the accumulation of AIB occurred only after a lag. The initial uptake rate of AIB was directly proportional to the intracellular K(+) concentration. The intracellular concentration of K(+) and AIB at their steady-state levels increased to a maximum as the Na(+) concentration in the suspending medium was increased. At Na(+) concentrations between 0.2 and 0.3 M, the molar ratio of K(+) to AIB at their intracellular steady-state concentrations was constant at 1.6. At external Na(+) concentrations less than 0.2 M, the cells maintained a relatively higher K(+) intracellular steady-state level than AIB. |
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Authors:
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J Thompson; R A MacLeod |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of bacteriology Volume: 120 ISSN: 0021-9193 ISO Abbreviation: J. Bacteriol. Publication Date: 1974 Nov |
Date Detail:
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Created Date: 1975-06-21 Completed Date: 1975-06-21 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 2985120R Medline TA: J Bacteriol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 598-603 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acids
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metabolism* Aminobutyric Acids / analogs & derivatives, metabolism Biological Transport, Active Carbon Isotopes Culture Media Kinetics Marine Biology Potassium / antagonists & inhibitors, metabolism* Potassium Isotopes Pseudomonas / cytology*, growth & development, metabolism Radioisotopes Rubidium / pharmacology Sodium / pharmacology |
| Chemical | |
Reg. No./Substance:
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0/Amino Acids; 0/Aminobutyric Acids; 0/Carbon Isotopes; 0/Culture Media; 0/Potassium Isotopes; 0/Radioisotopes; 7440-09-7/Potassium; 7440-17-7/Rubidium; 7440-23-5/Sodium |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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