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We introduced a cysteine residue on the surface of glucose dehydrogenase from Bacillus subtilis using site-directed mutagenesis. To this mutant, an NAD-analogue was covalently attached by a disulphide bridge so that it was active intramolecularly. The glucose dehydrogenase-cys44-NAD complex, which contained one reactive NAD molecule per subunit of glucose dehydrogenase, was operated together with lactate dehydrogenase in a coupled enzymatic regeneration of NAD(H) in a hollow fiber reactor. L-lactate and gluconic acid were continuously produced from pyruvate and D-glucose, respectively, with a turnover number of 45 cycles per minute for each NAD molecule. The total turnover per coenzyme was 135,000 for the first 2.5 days.
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