Abstract
Based on homology analysis of the PQQ (pyrroloquinoline quinone) glucose dehydrogenase (PQQGDH) gene fromEscherichia coli andAcinetobacter calcoaceticus, Glu742 was substituted to Lys by site directed mutagenesis of theE. coli PQQGDH gene (gcd). The mutant enzyme, E742K showed higher tolerance towards EDTA inactivation than wild type PQQGDH. This is the first mutagenesis study of putative a PQQ binding site in PQQ enzyme.
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