PROCESS FOR PREPARING POLYIPEPTIDES BY MEANS OF VECTORS INTERMEDIATING THE EXPRESSION RESULTING IN AN INCREASED PRODUCTION OF POLYPEPTIDES,PLASMIDES CONTAINING SUCH VECTORS AND HOST CELLS CONTAINING SUCH PLASTIDES

摘要

Disclosed is an improved plasmid which upon introduction into a suitable Escherichia coli host cell containing the thermolabile repressor CI, renders the host cell capable, upon increasing the temperature of the host cell to a temerature at which the repressor is destroyed, of effecting expression of a gene encoding superoxide dismutase inserted into the vector, and production of the superoxide dismutase encoded by the gene.