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Energetics of galactose, proline, and glutamine transport in a cytochrome-deficient mutant of salmonella typhimurium

✍ Scribed by Singh, A. P. ;Bragg, P. D.

Publisher: Wiley (John Wiley & Sons)
Year: 1977
Tongue: English
Weight: 489 KB
Volume: 6
Category: Article
ISSN: 0091-7419
DOI: 10.1002/jss.400060312

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✦ Synopsis

Abstract

The effect of inhibitors and uncouplers on the osmotic shock‐sensitive transport systems for glutamine and galactose (by the β‐methyl galactoside permease) was compared to their effect on the osmotic shock‐resistant proline and galactose permease systems in cytochrome‐deficient cells of Salmonella typhimurium SASY28. Both osmotic shock‐sensitive and ‐resistant systems were sensitive to uncouplers and to inhibitors of the membrane‐bound Ca^2+^, Mg^2+^‐activated adenosine triphosphatase. This suggests that uptake by both types of systems is energized in these cells by an electrochemical gradient of protons formed by ATP hydrolysis through the ATPase.

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## Abstract Highly purified ribose‐binding protein from Escherichia coli has been used to reconstitute a binding‐protein‐dependent ribose transport in spheroplasts derived from a binding‐protein‐deficient mutant of E coli K 12, and in spheroplasts derived from Salmonella typhimurium. The cross‐spec