Abstract
1. Lactate oxidase from Mycobacterium smegmatis is completely resolved into free flavin and apoenzyme by treatment with acid (NH4)2SO4. 2. Reconstitution involves rapid binding of FMN, but the recovery of enzyme activity was slower and appeared to be biphasic. 3. The preparation of the holoenzyme obtained differs from the native enzyme in specific activity, extinction coefficients and mobility on disc-gel electrophoresis. 4. Dialysis of this reconstituted enzyme in 0.1 M-sodium phosphate buffer, pH 7.0, at 0 degrees C for 1 week yields a preparation which closely resembles the native enzyme.
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