Abstract
An expression plasmid for calf prochymosin (prorennin) cDNA was constructed. The plasmid (pCR301) contains the lacUV5 promoter in front of the fused gene in which the codons for the N-terminal four amino acids of prochymosin cDNA were replaced with those for the N-terminal ten amino acids of β-galactosidase. Synthesis of the fused protein with the expected M r was detected immunologically in Escherichia coli harboring pCR301. The product seemed to be localized in the cell membrane of the bacterial host.
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