Wacker Chemie Ag

Markus Brunner

Tobias Dassler

Anneliese Reutter-Maier

Johanna Koch

A bacterial strain suitable for expressing recombinant proteins contains an open reading frame which codes for a recombinant protein, under control of a functional promoter. The bacterial strain contains an open reading frame which codes for a muted peptidologycan-associated lipoprotein (PAL protein), under control of a functional promoter, wherein the PAL protein is muted such that it contains no membrane anchor for the outer cell membrane of the bacterial strain. A plasmid codes for a recombinant protein. Fermentative production of recombinant protein is facilitated by using the bacterial strain, with increased product yields in the culture residue without leading to a substantial die-off of the bacterial cells.

Bacterial strain for releasing a recombinant protein in a fermentation method

A method for the production of natural L-cysteine by fermentation in a production fermenter in which a microorganism strain is cultured in a fermentation medium, characterized in that the fraction of the compounds L-cysteine, L-cystine and thiazolidine in the fermentation medium is controlled in a targeted manner by an iron concentration of a maximum of 8 mg/l in the fermentation medium.

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Munich, Germany

Markus Brunner