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. 1987 May;169(5):1899–1904. doi: 10.1128/jb.169.5.1899-1904.1987

A broad-host-range expression vector based on the pL promoter of coliphage lambda: regulated synthesis of human interleukin 2 in Erwinia and Serratia species.

R Leemans, E Remaut, W Fiers
PMCID: PMC212042  PMID: 2952635

Abstract

We report the construction of a broad-host-range expression vector based on an RSF1010-derived replicon. The vector carries the strong leftward promoter (pL) of coliphage lambda as well as the cI857 allele, which codes for a thermolabile repressor protein. The coding region of mature human interleukin 2, which is preceded by the ner ribosome binding site of phage Mu, was cloned downstream from the pL promoter. The plasmid was introduced into Erwinia and Serratia species by means of mobilization. Heat-inducible synthesis of interleukin 2 protein was obtained, showing that the pL promoter is functional in these genera. As in Escherichia coli, the bulk of the overproduced protein was present in an insoluble form.

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