PMID:5337844

Zablotny, R and Fraenkel, DG (1967) Glucose and gluconate metabolism in a mutant of Escherichia coli lacking gluconate-6-phosphate dehydrase.J. Bacteriol. 93:1579-81

Abstract

A mutant lacking gluconate-6-phosphate dehydrase (the first enzyme of the Entner-Doudoroff pathway) was isolated after ethyl methane sulfonate mutagenesis of Escherichia coli. Other enzymes of gluconate metabolism (gluconokinase, gluconate-6-phosphate dehydrogenase, and 2-keto-3-deoxygluconate-6-phosphate aldolase) were present in the mutant. When the mutant was grown on gluconate-1-(14)C, alanine isolated from protein was unlabeled, showing that the dehydrase was absent in vivo and that the sole pathway of gluconate metabolism in the mutant was the hexose monophosphate shunt. The mutant grew on gluconate with a doubling time of 155 min, compared with the parent strain's 56 min. On glucose and fructose it grew with normal doubling times. Thus, in E. coli, the Entner-Doudoroff pathway is used for gluconate metabolism but not for glucose metabolism.

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Annotations

Gene product	Qualifier	GO ID	GO term name	Evidence Code	with/from	Aspect	Notes	Status
6-Phosphogluconate Dehydratase		GO:0004456	phosphogluconate dehydratase activity	IMP: Inferred from Mutant Phenotype		F	See Table 1.	complete
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