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. 1982 Jun;150(3):1154–1163. doi: 10.1128/jb.150.3.1154-1163.1982

Characteristics of a Binding Protein-Dependent Transport System for sn-Glycerol-3-Phosphate in Escherichia coli That Is Part of the pho Regulon

Herbert Schweizer 1, Manfred Argast 1, Winfried Boos 1
PMCID: PMC216336  PMID: 7042685

Abstract

The ugp-dependent transport system for sn-glycerol-3-phosphate has been characterized. The system is induced under conditions of phosphate starvation and in mutants that are constitutive for the pho regulon. The system does not operate in membrane vesicles and is highly sensitive toward osmotic shock. The participation of a periplasmic binding protein in the transport process can be deduced from the isolation of transport mutants that lack the binding protein. As with other binding protein-dependent transport systems, this protein appears to be necessary but not sufficient for transport activity. The isolation of mutants has become possible by selection for resistance against the toxic analog 3,4-dihydroxybutyl-1-phosphonate that is transported by the system. sn-Glycerol-3-phosphate transported via ugp cannot be used as the sole carbon source. Strains have been constructed that lack alkaline phosphatase and glycerol kinase. In addition, they are constitutive for the glp regulon and contain high levels of glycerol-3-phosphate dehydrogenase. Despite the fact that these strains exhibit high ugp-dependent transport activity for sn-glycerol-3-phosphate they are unable to grow on it as a sole source of carbon. However, when cells are grown on an alternate carbon source, 14C label from [14C]sn-glycerol-3-phosphate appears in phospholipids as well as in trichloroacetic acid-precipitable material. The incorporation of 14C label is strongly reduced when sn-glycerol-3-phosphate is the only carbon source. In the presence of an alternate carbon source, this inhibition is relieved, and sn-glycerol-3-phosphate transported by ugp can be used as the sole source of phosphate.

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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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