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. 1984 Oct;160(1):22–27. doi: 10.1128/jb.160.1.22-27.1984

Proline uptake through the major transport system of Salmonella typhimurium is coupled to sodium ions.

J Cairney, C F Higgins, I R Booth
PMCID: PMC214675  PMID: 6090414

Abstract

Strains of Salmonella typhimurium deficient in one or more of the proline transport systems have been constructed and used to study the mechanism of energy coupling to transport. Proline uptake through the major proline permease (PP-I, putP) is shown to be absolutely coupled to Na+ ions and not to H+ ions as has previously been assumed. Transport through the minor proline permease (PP-II, proP), however, is unaffected by the presence or absence of Na+. The effect of Na+ on the kinetics of proline uptake shows that external Na+ increases the Vmax for transport. It seems probable that proline transport through PP-I is also coupled to Na+ ions in Escherichia coli.

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Selected References

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