3-Dehydroquinate Production by Oxidative Fermentation and Further Conversion of 3-Dehydroquinate to the Intermediates in the Shikimate Pathway
Open Access
- 1 January 2003
- journal article
- Published by Oxford University Press (OUP) in Bioscience, Biotechnology, and Biochemistry
- Vol. 67 (10), 2124-2131
- https://doi.org/10.1271/bbb.67.2124
Abstract
3-Dehydroquinate production from quinate by oxidative fermentation with Gluconobacter strains of acetic acid bacteria was analyzed for the first time. In the bacterial membrane, quinate dehydrogenase, a typical quinoprotein containing pyrroloquinoline quinone (PQQ) as the coenzyme, functions as the primary enzyme in quinate oxidation. Quinate was oxidized to 3-dehydroquinate with the final yield of almost 100% in earlier growth phase. Resting cells, dried cells, and immobilized cells or an immobilized membrane fraction of Gluconobacter strains were found to be useful biocatalysts for quinate oxidation. 3-Dehydroquinate was further converted to 3-dehydroshikimate with a reasonable yield by growing cells and also immobilized cells. Strong enzyme activities of 3-dehydroquinate dehydratase and NADP-dependent shikimate dehydrogenase were detected in the soluble fraction of the same organism and partially fractionated from each other. Since the shikimate pathway is remote from glucose in the metabolic pathway, the entrance into the shikimate pathway from quinate to 3-dehydroquinate looks advantageous to produce metabolic intermediates in the shikimate pathway.Keywords
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