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. 1980 Jun;142(3):755–762. doi: 10.1128/jb.142.3.755-762.1980

Energization of Glucose Transport by Pseudomonas fluorescens

Antonio H Romano 1, Anna Voytek 1, Arthur M Bruskin 1
PMCID: PMC294088  PMID: 6769909

Abstract

We have measured the capacity of Pseudomonas fluorescens to transport the glucose analog 2-deoxy-d-glucose and the amino acids l-alanine and α-aminoisobutyric acid under conditions in which the cells could generate (i) both a membrane proton motive force and high-energy phosphate compounds, (ii) a proton motive force but not high-energy phosphate compounds, and (iii) neither a proton motive force nor high-energy phosphate compounds. This was done by depleting cells of adenosine triphosphate stores by treatment with sodium arsenate and then suspending them in a phosphate-free medium, where they could generate a proton motive force but not phosphate bond energy, or in a phosphate-containing medium, where they could generate both a proton motive force and phosphate bond energy. Inclusion of the proton-conducting ionophore carbonyl cyanide-m-chlorophenyl hydrazone under either condition precluded the generation of both a proton motive force and phosphate bond energy. The amino acids l-alanine and α-aminoisobutyric acid were transported independently of phosphate bond energy and required only a proton motive force. 2-Deoxy-d-glucose was transported only under conditions in which phosphate bond energy could be generated. These results are consistent with the findings of others that Pseudomonas aeruginosa produces an inducible shock-sensitive glucose-binding protein and conform to the generalization that binding protein-associated transport systems are energized by phosphate bond energy.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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