High-level expression of M13 gene II protein from an inducible polycistronic messenger RNA.

Bacteriophage M13 gene II has been cloned in the plasmid expression vector pING1 and thereby placed under the control of the inducible araB promoter of Salmonella typhimurium. Upon induction with arabinose, gene II is transcribed as part of a polycistronic messenger RNA which initiates at the araB promoter. Subsequent translation of this message results in the coordinate, high-level expression of several proteins, including the gene II protein. Using this expression system, we have been able to overproduce gene II protein to a level of almost 15% of the total protein in Escherichia coli cells, thus providing an abundant source for its purification.