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. 1985 Sep;163(3):824–831. doi: 10.1128/jb.163.3.824-831.1985

Nucleotide sequence and promoter region for the neutral protease gene from Bacillus stearothermophilus.

M Takagi, T Imanaka, S Aiba
PMCID: PMC219205  PMID: 2993245

Abstract

The thermostable neutral protease gene nprT of Bacillus stearothermophilus was sequenced. The DNA sequence revealed only one large open reading frame, composed of 1,644 bases and 548 amino acid residues. A Shine-Dalgarno sequence was found 9 bases upstream from the translation start site (ATG), and the deduced amino acid sequence contained a signal sequence in its amino-terminal region. The sequence of the first 14 amino acids of purified extracellular protease completely matched that deduced from the DNA sequence starting at GTC (Val), 687 bases (229 amino acids) downstream from ATG. This suggests that the protease is translated as a longer polypeptide. The amino acid sequence of the extracellular form of this protease (319 amino acids) was highly homologous to that of the thermostable neutral protease from Bacillus thermoproteolyticus but less homologous to the thermolabile neutral protease from Bacillus subtilis. A promoter region determined by S1 nuclease mapping (TTTTCC for the -35 region and TATTTT for the -10 region) was different from the conserved promoter sequences recognized by the known or factors in bacilli. However, it was very homologous to the promoter sequence of the spo0B gene from B. subtilis. The guanine-plus-cytosine content of the coding region of the nprT gene was 58 mol%, while that of the third letter of the codons was much higher (72 mol%).

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Selected References

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