Abstract
A β-cyclodextrin glucosyltransferase was purified from alkalophilic Bacillus sp. No. 562 over 64-fold with a yield of 32%. Its molecular size was estimated to be 170 kDa by gel filtration and 82 kDa by SDS-PAGE, with a pI of 7.2. The enzyme showed optimum activity at 65 °C and pH 7.0. It was stable from 0 to70 °C and from pH 7.0 to 11.0. The enzyme was specifically inhibited by Fe2+ and Fe3+.
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