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. 1986 Jun;166(3):722–727. doi: 10.1128/jb.166.3.722-727.1986

Structure of a beta-galactosidase gene of Bacillus stearothermophilus.

H Hirata, T Fukazawa, S Negoro, H Okada
PMCID: PMC215182  PMID: 3086288

Abstract

The nucleotide sequence of the bgaB gene, which encodes the thermostable beta-galactosidase I of Bacillus stearothermophilus, and its flanking region was determined. A 2,016-base-pair open reading frame observed was concluded to be for beta-galactosidase I (Mr 78,051) from observations that the amino acid composition of the enzyme and the sequence of 14 amino acids from the amino-terminus of the enzyme coincided with those deduced from this open frame. A 107-base-pair HaeIII-AluI fragment just upstream of the estimated Shine-Dalgarno sequence of the bgaB gene had promoter activity toward cat-86 (chloramphenicol acetyltransferase gene) and produced the enzyme at a level equivalent to 7% of the total cellular protein of B. subtilis. From the base sequence of this DNA region and the transcriptional start site determined by S1 nuclease mapping, the -35 and -10 sequences are estimated to be TTGACA and TAATTT, respectively, which are similar to the consensus sequence of B. subtilis sigma 43 RNA polymerase.

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Selected References

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