Abstract
A new, thermostable superoxide dismutase (SOD) from Bacillus licheniformis M20, isolated from Bulgarian mineral springs, was purified 11-fold with 11% recovery of activity. From native PAGE and SDS-PAGE, the enzyme was composed of two subunits of 21.5kDa each. The SOD was inhibited only by NaN(3), which suggested that this SOD is of the manganese superoxide dismutase type. The purified enzyme had maximum activity at pH 8 and 55°C. The half-life of the SOD was 10min at 95°C.
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