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The alpha-galactosidase gene aga36A of Clostridium stercorarium F-9 was cloned, sequenced, and expressed in Escherichia coli. The aga36A gene consists of 2,208 nucleotides encoding a protein of 736 amino acids with a predicted molecular weight of 84,786. Aga36A is an enzyme classified in family 36 of the glycoside hydrolases and showed sequence similarity with some enzymes of family 36 such as Geobacillus (formerly Bacillus) stearothermophilus GalA (57%) and AgaN (52%). The enzyme purified from a recombinant E. coli is optimally active at 70 degrees C and pH 6.0. The enzyme hydrolyzed raffinose and guar gum with specific activities of 3.0 U/mg and 0.46 U/mg for the respective substrates.
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