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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1983 Jun;80(12):3671–3675. doi: 10.1073/pnas.80.12.3671

Synthesis of calf prochymosin (prorennin) in Escherichia coli.

J S Emtage, S Angal, M T Doel, T J Harris, B Jenkins, G Lilley, P A Lowe
PMCID: PMC394112  PMID: 6304731

Abstract

A gene for calf prochymosin (prorennin) has been reconstructed from chemically synthesized oligodeoxyribonucleotides and cloned DNA copies of preprochymosin mRNA. This gene has been inserted into a bacterial expression plasmid containing the Escherichia coli tryptophan promoter and a bacterial ribosome binding site. Induction of transcription from the tryptophan promoter results in prochymosin synthesis at a level of up to 5% of total protein. The enzyme has been purified from bacteria by extraction with urea and chromatography on DEAE-cellulose and converted to enzymatically active chymosin by acidification and neutralization. Bacterially produced chymosin is as effective in clotting milk as the natural enzyme isolated from calf stomach.

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Selected References

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