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Pathways for Metabolism of Ketoaldonic Acids in an Erwinia Sp

Overview
Journal J Bacteriol
Specialty Microbiology
Date 1991 Nov 1
PMID 1938871
Citations 12
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Abstract

The pathways involved in the metabolism of ketoaldonic acids by Erwinia sp. strain ATCC 39140 have been investigated by use of a combination of enzyme assays and isolation of bacterial mutants. The catabolism of 2,5-diketo-D-gluconate (2,5-DKG) to gluconate can proceed by two separate NAD(P)H-dependent pathways. The first pathway involves the direct reduction of 2,5-DKG to 5-keto-D-gluconate, which is then reduced to gluconate. The second pathway involves the consecutive reduction of 2,5-DKG to 2-keto-L-gulonate and L-idonic acid, which is then oxidized to 5-keto-D-gluconate, which is then reduced to gluconate. Gluconate, which can also be produced by the NAD(P)H-dependent reduction of 2-keto-D-gluconate, is phosphorylated to 6-phosphogluconate and further metabolized through the pentose phosphate pathway. No evidence was found for the existence of the Entner-Doudoroff pathway in this strain.

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