MUTANT GLYCEROL DEHYDROGENASE (GLYDH) FOR THE PRODUCTION OF A BIOCHEMICAL BY FERMENTATION

摘要

The present invention concerns a method for the production of 1,2-propanediol, comprising culturing a micro organism modified for an improved production of 1,2- propanediol in an appropriate culture medium and recovery of the 1,2-propanediol which may be further purified wherein the microorganism expresses a glycerol dehydrogenase (GlyDH) enzyme the inhibition of which activity by NAD+ and/or its substrate and/or its product is reduced. The present invention also relates to a mutant glycerol dehydrogenase(Gly DH) comprising at least one amino acid residue in the protein sequence of the parent enzyme replaced by a different amino acid residue at the same position wherein - the mutant enzyme has retained more than 50% of the glycerol dehydrogenase activity of the parent enzyme and - the glycerol dehydrogenase activity of the mutant GlyDH is less inhibited by NAD+ and/or by its substrate as compared to the parent enzyme and/or by its product as compared to the parent enzyme.