Patent ID: 7083952

Claim:
A method for the microbial production of L-serine comprising the steps of: a) isolating at least one nucleic acid from a coryneform bacterium, coding for a phosphoserine phosphatase (serB) or a phosphoserine aminotransferase (serC) according to one of SEQ no. 1, 3, 5, or 7 and a nucleic acid coding for an L-threonine export carrier according to one of SEQ ID NO. 9 or 11, transferring the isolated nucleic acid to a coryneform bacterium and expressing it therein, increasing the gene expression as compared to the corresponding genetically unmodified microorganism, b) using the genetically modified microorganism from step a) for the fermentative production of L-serine in a culture medium, and c) isolating the L-serine formed from the culture medium.