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. 1984 Oct;3(10):2437–2442. doi: 10.1002/j.1460-2075.1984.tb02151.x

Secretion cloning vectors in Escherichia coli.

J Ghrayeb, H Kimura, M Takahara, H Hsiung, Y Masui, M Inouye
PMCID: PMC557705  PMID: 6094184

Abstract

The DNA fragment coding for the signal peptide of the OmpA protein, a major outer membrane protein of Escherichia coli, has been inserted into the high-level expression vectors, pIN-III. A foreign DNA fragment can be cloned in any one of the three reading frames at the unique EcoRI, HindIII or BamHI sites immediately after the ompA signal peptide coding sequence. The cloned foreign gene is under the control of both the lpp promoter and the lac promoter-operator. The expression of the gene is regulated by the lac repressor produced by the same vectors. Using the pIN-III-ompA vector, the DNA fragment coding for only the mature portion of beta-lactamase was inserted into the EcoRI site. Upon induction of gene expression, beta-lactamase was secreted into the periplasmic space. The ompA signal peptide was correctly removed resulting in the production of beta-lactamase with four extra amino acid residues (Gly-Ile-Pro-Gly) at its amino terminus due to the linker sequence in the vector. After a 3-h induction, beta-lactamase was accumulated to 20% of total cellular protein without any detectable accumulation of pro-beta-lactamase. Using oligonucleotide-directed site-specific mutagenesis, we have also removed the linker sequence and upon induction of gene expression, beta-lactamase with the authentic NH2-terminal sequence was produced, in even larger amounts than the beta-lactamase with the linker sequence.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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