Consortium Fur Elektrochemische Industrie Gmbh

Gunter Wich

Walfred Leinfelder

Keith Backman

A tryptophan producing strain of microorganism is selected from,and Corynebacteria and is tryptophan feedback resistant and serine feedback resistant. The serine feedback resistance is by a mutation in a serA allele, where the mutated serA allele codes for a protein which has a K,value for serine between 0.1 mM and 50 mM. The tryptophan feedback resistance is by a trpE allele which codes for a protein which has a K,value for tryptophan between 0.1 mM and 20 mM. A process for preparing this microorganism and a process for using this microorganism are disclosed.

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M{umlaut over (u)}nchen, Germany

Gunter Wich