Process for the preparation of l-amino acids using strains of the enterobacteriaceae family which contain an enhanced succ or sucd gene

摘要

The invention relates to a process for the preparation of L-amino acids, in particular L-threonine, in which the following steps are carried out: a) fermentation of microorganisms of the Enterobacteriaceae family which produce the desired L-amino acid and in which at least the malE gene, or the nucleotide sequence which codes for this, is or are enhanced, in particular over-expressed, b) concentration of the desired L-amino acid in the medium or in the cells of the bacteria, and c) isolation of the desired L-amino acid.