A raw-starch-digesting amylase (RSDA) gene from a Cytophaga sp. was cloned and sequenced. The predicted protein product contained 519 amino acids and had high amino acid identity to alpha-amylases from three Bacillus species. Only one of the Bacillus alpha-amylases has raw-starch-digesting capability, however. The RSDA, expressed in Escherichia coli, had properties similar to those of the enzyme purified from the Cytophaga sp.
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Jeang et al. (2002) studied this question.
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