Improved bacterial host cell for the direct expression of peptides

摘要

Expression systems arc disclosed for the direct expression of peptide products into the culture media where genetically engineered host cells are grown. High yield was achieved with a special selection of hosts, and/or fermentation processes which include careful control of cell growth rate, and use of an inducer during growth phase. Special universal cloning vectors are provided for the preparation of expression vectors which include control regions having multiple promoters linked operably with coding regions encoding a signal peptide upstream from a coding region encoding the peptide of interest. Multiple transcription cassettes are also used to increase yield. The production of amidated peptides using the expression systems is also disclosed.