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. 1996 Aug;62(8):2915–2918. doi: 10.1128/aem.62.8.2915-2918.1996

The glucose transport system of the hyperthermophilic anaerobic bacterium Thermotoga neapolitana

MY Galperin 1, KM Noll 1, AH Romano 1
PMCID: PMC168078  PMID: 9285772

Abstract

The glucose transport system of the extremely thermophilic anaerobic bacterium Thermotoga neapolitana was studied with the nonmetabolizable glucose analog 2-deoxy-D-glucose (2-DOG). T. neapolitana accumulated 2-DOG against a concentration gradient in an intracellular free sugar pool that was exchangeable with external source of energy, such as pyruvate, and was inhibited by arsenate and gramicidin D. There was no phosphoenolpyruvate-dependent phosphorylation of glucose, 2-DOG, or fructose by cell extracts or toluene-treated cells, indicating the absence of a phosphoenolpyruvate:sugar phosphotransferase system. These data indicate that D-glucose is taken up by T. neapolitana via an active transport system that is energized by an ion gradient generated by ATP, derived from substrate-level phosphorylation.

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Selected References

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