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The genes for alkaline protease (apr[BamP]) and neutral protease (npr[BamP]) from Bacillus amyloliquefaciens have been isolated and expressed in Bacillus subtilis. The DNA sequences of apr[BamP] and npr[BamP] revealed, in each case, the presence of a large open reading frame. The inferred amino acid sequence of either gene contained a signal sequence and an additional polypeptide sequence ('pro' sequence) preceding the mature protein. Based on DNA sequence, the start point of translation has been identified as amino acid residue - 107 for apr[BamP] and -221 for npr[BamP]. To demonstrate that the start point of translation of apr[BamP] in vivo is probably at codon -107, codon -103 (AAA) was changed to an ochre (TAA) by site-directed mutagenesis. Alkaline protease was produced from this ochre mutant derivative of apr[BamP] only when the host strain was Su+. The presence of a pro sequence may be common to all of the secreted proteases from bacilli.

journal of bacteriology

Genes for alkaline protease and neutral protease from Bacillus amyloliquefaciens contain a large open reading frame between the regions coding for signal sequence and mature protein