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. 1986 Dec;168(3):1107–1111. doi: 10.1128/jb.168.3.1107-1111.1986

Transport of trehalose in Salmonella typhimurium.

P W Postma, H G Keizer, P Koolwijk
PMCID: PMC213609  PMID: 3023298

Abstract

We have studied trehalose uptake in Salmonella typhimurium and the possible involvement of the phosphoenolpyruvate:carbohydrate phosphotransferase system (PTS) in this process. Two transport systems could recognize and transport trehalose, the mannose PTS and the galactose permease. Uptake of trehalose via the latter system required that it be expressed constitutively (due to a galR or galC mutation). Introduction of a ptsM mutation, resulting in a defective IIMan/IIIMan system, in S. typhimurium strains that grew on trehalose abolished growth on trehalose. A ptsG mutation, eliminating IIGlc of the glucose PTS, had no effect. In contrast, a crr mutation that resulted in the absence of IIIGlc of the glucose PTS prevented growth on trehalose. The inability of crr and also cya mutants to grow on trehalose was due to lowered intracellular cyclic AMP synthesis, since addition of extracellular cyclic AMP restored growth. Subsequent trehalose metabolism could be via a trehalose phosphate hydrolase, if trehalose phosphate was formed via the PTS, or trehalase. Trehalose-grown cells contained trehalase activity, but we could not detect phosphoenolpyruvate-dependent phosphorylation of trehalose in toluenized cells.

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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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