Abstract

Glucose oxidase, a FAD-enzyme is not inhibited by blue light in contrast to some FMN-enzymes. If the natural coenzyme is substituted by FMN, the enzymatic activity is low. Blue light, however, restores the enzymatic activity of this combination to almost the activity of the native enzyme. The experiments indicate that FMN plus blue light or the excited FMN molecule can substitute for the original coenzyme FAD of glucose oxidase. It is possible to photoregulate the FMN-combination by substances such as KI or NiSO 4 that quench the triplet state of excited flavin molecules.

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