High-level production of diacetyl in a metabolically engineered lactic acid bacterium

Christian Solem (Inventor), Peter Ruhdal Jensen (Inventor), Jianming Liu (Inventor)

Research output: Patent

329 Downloads (Pure)


The present invention provides a genetically modified lactic acid bacterium capable of producing diacetyl under aerobic conditions. Additionally the invention provides a method for producing diacetyl using the genetically modified lactic acid bacterium under aerobic conditions in the presence of a source of iron-containing porphyrin and a metal ion selected from Fe3+, Fe2+ and Cu2+. The lactic acid bacterium is genetically modified by deletion of those genes in its genome that encode polypeptides having lactate dehydrogenase (E.C; α-acetolactate decarboxylase (E.C; water-forming NADH oxidase (E.C.; phosphotransacetylase (E.C. activity; and optionally devoid of or deleted for genes encoding polypeptides having diacetyl reductase ((R)-acetoin forming; EC:; D-acetoin reductase; butanediol dehydrogenase ((R,R)-butane-2,3-diol forming; E.C. and alcohol dehydrogenase (E.C. activity. The invention provides for use of the genetically modified lactic acid bacterium for the production of diacetyl and a food product.

Original languageEnglish
IPCC12N 15/ 74 A I
Patent numberWO2017060455
Filing date13/04/2017
CountryInternational Bureau of the World Intellectual Property Organization (WIPO)
Priority date25/02/2016
Priority numberEP20160157443
Publication statusPublished - 13 Apr 2017

Cite this