Abstract
A hybrid plasmid phGH928 was constructed which contains a human growth hormone gene following a region coding for the promoter and head portion of prepropeptide composed of 48 amino acid residues from the Bacillus amyloliquefaciens neutral protease gene. This plasmid permitted efficient secretion of the hormone in Bacillus subtilis. The N-terminal amino acid sequence analysis suggested that the prepropeptide was deleted during secretion. It showed also that the secreted hormone contained additional amino acid sequences derived from the junction between the prepropeptide coding region and the mature human growth hormone gene sequence. We confirmed that the secreted hormone was biologically active stimulating the growth of rat lymphoma cell.
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