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Abstract
Three sulfhydryl groups occur in Bacillus cereus β-amylase molecule : two of them, which are located closely on the polypeptide chain, form intramolecular -S-S- linkage ; one of them is free -SH form, which is involved in enzyme activity. The amino acid sequences around these sulfhydryl groups are HQCGGNVGDDCNVPIPSW or TCLEM, respectively. The free sulfhydryl group in B.cereus β-amylase corresponds to cys324 in B. polymyxa β-amylase, cys343 in soybean β-amylase, and cys34l in barley β-amylase. The amino acid sequences around the sulfhydryl groups are highly homologous in each β-amylase. These data support the idea that the sulf hydrylgroups in each β-amylase molecule are of importance to maintain an environment of enzyme activity.
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