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Transport of D-arabinose-5-phosphate and D-sedoheptulose-7-phosphate by the Hexose Phosphate Transport System of Salmonella Typhimurium

Transport of D-arabinose-5-phosphate and D-sedoheptulose-7-phosphate by the Hexose Phosphate Transport System of Salmonella Typhimurium

L Eidels, P D Rick, N P Stimler, M J Osborn

J Bacteriol. 1974 Jul;119(1):138-43.

PMID: 4600697

Abstract:

d-Arabinose-5-phosphate and d-sedoheptulose-7-phosphate were found to be substrates, although not inducers, of the hexose phosphate transport system of Salmonella typhimurium. Transport of these two sugar phosphates by wild-type strains required preinduction of the hexose phosphate transport system. A mutant of S. typhimurium constitutive for this system also transported d-arabinose-5-phosphate and d-sedoheptulose-7-phosphate in a constitutive fashion. Glucose-6-phosphate was a potent competitor of the transport of both d-arabinose-5-phosphate and d-sedoheptulose-7-phosphate. The K(m) values for transport of d-glucose-6-phosphate, d-arabinose-5-phosphate, and d-sedoheptulose-7-phosphate were 0.13, 0.32 and 1.61 mM, respectively. The apparent V(max) values for transport of d-glucose-6-phosphate, d-arabinose-5-phosphate, and d-sedoheptulose-7-phosphate were 6.3, 13.2 and 3.0 nmol per min per 5 x 10(8) bacteria, respectively. d-Ribulose-5-phosphate and d-xylulose-5-phosphate did not inhibit transport of the above substrates, whereas d-ribose-5-phosphate was a weak inhibitor of d-sedoheptulose-7-phosphate transport.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP10323203	D-(−)-Arabinose		10323-20-3	Price

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