Patent ID: 7312058

Claim:
A mutant serine acetyltransferase comprising an amino acid sequence selected from the group consisting of: a) SEQ. ID NO. 2, wherein the amino acid sequence thereof corresponding to positions from 89 to 96 contains one or several mutations, b) an amino acid sequence which is at least 90% homologous to SEQ ID NO. 2, wherein the amino acid sequence thereof corresponding to positions from 89 to 96 contains one or several mutations, and wherein said one or several mutations results in said mutant serine acetyltransferase being desensitized to feedback inhibition by L-cysteine, and wherein the triple mutant with substitutions of Lys for the Asn at position 51, His for the Arg at position 91 and Tyr for the His at position 233 is excluded.