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. 1993 Feb;59(2):623–627. doi: 10.1128/aem.59.2.623-627.1993

Cloning of the beta-amylase gene from Bacillus cereus and characteristics of the primary structure of the enzyme.

T Nanmori 1, M Nagai 1, Y Shimizu 1, R Shinke 1, B Mikami 1
PMCID: PMC202157  PMID: 8434930

Abstract

The gene encoding the beta-amylase of Bacillus cereus BQ10-S1 (SpoII) was cloned into Escherichia coli JM 109. A sequenced DNA fragment of 2,001 bp contains the beta-amylase gene. The N-terminal sequences (AVNGKG MNPDYKAYLMAPLKKI), the C-terminal sequences (SHTSSW), and the amino acid sequences of the five regions in the beta-amylase molecules were determined. The mature beta-amylase contains 514 amino acid residues with a molecular mass of 57,885 Da. The amino acid sequence homology with those of known beta-amylases was 52.7% for Bacillus polymyxa, 52.0% for Bacillus circulans, 43.4% for Clostridium thermosulfurogenes, 31.8% for Arabidopsis thaliana, 31.5% for barley, 29.9% for sweet potato, and 28.9% for soybean. Ten well-conserved regions were found between the N terminus and the area around residue 430, but the C-terminal region of 90 residues has no similarity with those of the plant beta-amylases. The homology search revealed that this C-terminal region has homology with C-terminal regions of the beta-amylase from C. thermosulfurogenes, some bacterial alpha-amylases, cyclodextrin glucanotransferase, and glucoamylase. Some of these sequences are known as the raw-starch-binding domain. These results suggest that B. cereus beta-amylase has an extra domain which has raw-starch-binding ability and that the domain has considerable sequence homology with those of other amylases or related enzymes from a wide variety of microorganisms.

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Selected References

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