Nucleotide sequences coding for branched-chain amino acids export proteins, method for isolating them and their use

摘要

Isolated polynucleotide (I) contains at least one sequence that (i) is 70% identical with a sequence that encodes at least one of 251 amino acid (aa) (3) or 108 aa (5) polypeptides; (ii) encodes a polypeptide at least 70% identical with (3) or (5); (iii) is the complement of (i) or (ii), or (iv) contains at least 15 consecutive bases from (i)-(iii). Independent claims are also included for the following: (a) protein derived from sequences of 753 bp (2) or 324 bp (4); (b) coryneform microorganisms, especially Corynebacterium, transformed with one or more (I), where these are replicative DNA; (c) production of branched-chain L-aa by fermentation of coryneform bacteria in which the brnE and/or brnF genes (or equivalent sequences) are amplified, especially overexpressed; and (d) method for isolating the brnE and/or brnF genes.