Expression vector and its use for an antibiotic free expression

摘要

The invention relates to an expression vector to be used in an auxotrophic, prokaryotic host cell as well as an expression system containing an expression vector and an auxotrophic, prokaryotic host cell. The invention further relates to an antibiotic-free fermentation medium containing an inventive expression vector and a method for the antibiotic-free expression of peptides/proteins.