Process for demethylating s-methyl-mercapto compounds

C - Chemistry – Metallurgy – 12 – P

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C12P 11/00 (2006.01) C12N 1/20 (2006.01) C12P 13/04 (2006.01)

Patent

CA 2194683

The invention concerns a process for preparing mercapto compounds comprising the step of demethylating an S-methyl-mercapto compound of Formula (I) to the corresponding mercapto compound of Formula (II), using a microorganism which is capable of demethylating S-methyl-3-mercapto-propionate (MMPA) to 3- mercaptopropionate (MPA) or using an enzyme preparation derivable from such microorganism. Preferably the group R denotes CH2-CH2-COOH (I is MMPA), CH2- CH(NH2)-COOH (I is S-methyl-cystein), CH2-CH2-CH(NH2)-COOH (I is methionine) and CH2-COOH (I is methylmercapto-acetate) or a salt or ester of any of these. Preferably the microorganisms are methanogenic archaea of the genus Methanosarcina or obtained by inocculating a suitable medium containing MMPA with salt marsh or marine sediment followed by one or more transfers into fresh medium containing MMPA and suppression of the growth of Bacteria, but not of Archaea in the culture e.g. with an antibiotic.

L'invention concerne un procédé de préparation de composés de mercapto consistant à effectuer la déméthylation d'un composé de méthyle-mercapto de Formule (I) permettant d'obtenir le composé de mercapto correspondant de Formule (II) à l'aide d'un microorganisme pouvant effectuer la déméthylation de S-méthyle-3-mercapto-propionate (MMPA) en 3-mercaptopropionate (MPA) ou à l'aide d'une préparation d'enzyme obtenue à partir d'un tel microorganisme. Le groupe R représente de préférence CH¿2?-CH¿2?-COOH (I représente MMPA), CH¿2?-CH(NH¿2?)-COOH (I représente S-méthyle-cystéine), CH¿2?-CH¿2?-CH(NH¿2?)-COOH (I représente méthionine) et CH¿2?-COOH (I représente méthylmercapto-acétate) ou un sel ou un ester de ceux-ci. Les microorganismes sont de préférence constitués d'archae méthanogénique du genre Methanosarcina ou bien sont obtenus par inoculation d'un milieu approprié contenant du MMPA à l'aide d'un sédiment marin ou d'eau des salines suivi d'un ou de plusieurs transferts dans un milieu neuf contenant du MMPA, et de la suppression de la croissance des bactéries, mais non des archaes dans la culture, par exemple au moyen d'un antibiotique.

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