pETDuet-1 is designed for the coexpression of two target genes. The vector encodes two multiple cloning sites (MCS), each of which is preceded by a T7 promoter, lac operator and ribosome binding sites.

The Duet vectors are T7 promoter expression vectors, each designed to coexpress two target proteins in E. coli. The Duet vectors carry compatible replicons and antibiotic resistance markers and may be used together in appropriate host strains to coexpress up to eight proteins. Certain combinations of Duet vectors and pET or pETcoco™ vectors are also compatible for coexpression. The capability of Duet vectors to be cotransformed, propagated, and induced for robust target protein coexpression makes them ideal for the analysis of protein complexes. The Duet vectors are designed with compatible replicons and drug resistance genes for effective propagation and maintenance of four plasmids in a single cell.