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It is widely believed that protochlorophyllide reductase is a flavoenzyme effecting catalysis by a radical mechanism. Here the cyanobacterial reductase has been isolated from Escherichia coli overexpressing the Synechocystis gene. The purified enzyme, while retaining full activity, has no detectable flavine. No radical derived ESR signal was observed during catalysis or on photoexcitation under non-catalytic...
Plasmodium falciparum glutathione reductase (PfGR) has emerged as a drug target against tropical malaria. Here we report the expression of PfGR in Escherichia coli SG5(DE3) and isolation procedures for this protein. Recombinant PfGR does not differ from the authentic enzyme in its enzymic properties, the turnover number being 9900 min -1 . The dimeric flavoenzyme exhibits redox-dependent...
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