Process for producing 2-keto-l-gulonic acid

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/53 (2006.01) C12N 1/21 (2006.01) C12N 9/02 (2006.01) C12N 9/04 (2006.01) C12P 7/60 (2006.01)

Patent

CA 2183632

An expression vector containing both a DNA encoding an L-sorbose dehydrogenase and a DNA encoding an L-sorbosone dehydrogenase; a transformant having an ability to produce 2-keto-L-gulonic acid (hereinafter 2KLGA) at high yields from D-sorbitol, which is prepared by transforming, with said expression vector, a microorganism capable of producing L-sorbose at high yields from D-sorbitol, which has no or low 2KLGA-decomposing activity or a host microorganism having, in addition to the above-mentioned properties, no or low L-idonic acid- producing activity; and a process for producing 2KLGA, which comprises culturing said transformant in a medium containing D-sorbitol. According to the present invention, 2KLGA useful for the production of L-ascorbic acid can be produced with ease and in larger amounts by a single operation of culture.

Un vecteur d'expression contenant à la fois un ADN codant pour la L-sorbose déshydrogénase et un ADN codant pour la L-sorbosone déshydrogénase; un transformant capable de produire à rendement élevé l'acide 2-céto-L-gulonique (2KLGA) à partir du D-sorbitol, lequel transformant a été préparé au moyen dudit vecteur par transformation d'un micro-organisme qui produit à rendement élevé le L-sorbose à partir du D-sorbitol et qui n'a pas ou peu d'activité de décomposition du 2KLGA, ou d'un tel micro-organisme doté en outre de peu ou d'aucune activité de production d'acide L-idonique; et un procédé de production de 2KLGA par culture du transformant dans un milieu contenant du D-sorbitol. Le procédé de l'invention permet facilement la préparation de 2KLGA utile à la production d'acide L-ascorbique, et ce en grandes quantités et avec une bonne efficacité, par une simple culture.

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