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. 1984 Jul 11;12(13):5307–5319. doi: 10.1093/nar/12.13.5307

Length and structural effect of signal peptides derived from Bacillus subtilis alpha-amylase on secretion of Escherichia coli beta-lactamase in B. subtilis cells.

K Ohmura, K Nakamura, H Yamazaki, T Shiroza, K Yamane, Y Jigami, H Tanaka, K Yoda, M Yamasaki, G Tamura
PMCID: PMC318921  PMID: 6087281

Abstract

The precursor of Bacillus subtilis alpha-amylase contains an NH2-terminal extension of 41 amino acid residues as the signal sequence. The E. coli beta-lactamase structural gene was fused with the DNA for the promoter and signal sequence regions. Activity of beta-lactamase was expressed and more than 95% of the activity was secreted into the culture medium. DNA fragments coding for short signal sequences 28, 31, and 33 amino acids from the initiator Met were prepared and fused with the beta-lactamase structural gene. The sequences of 31 and 33 amino acid residues with Ala COOH-terminal amino acid were able to secrete active beta-lactamase from B. subtilis cells. However beta-lactamase was not secreted into the culture medium by the shorter signal sequence of 28 amino acid residues, which was not cleaved. Molecular weight analysis of the extracellular and cell-bound beta-lactamase suggested that the signal peptide of B. subtilis alpha-amylase was the first 31 amino acids from the initiator Met. The significance of these results was discussed in relation to the predicted secondary structure of the signal sequences.

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Selected References

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