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ThePseudomonas multivorans glucose-6-phosphate dehydrogenase (EC 1.1.1.49) active with nicotinamide adenine dinucleotide, which is inhibitable by adenosine-5'-triphosphate, was purified approximately 1,000-fold from extracts of glucose-grown bacteria, and characterized with respect to subunit composition, response to different inhibitory ligands, and certain other properties. The enzyme was found to be an oligomer composed of four subunits of about 60,000 molecular weight. Reduced nicotinamide adenine dinucleotide phosphate, but not reduced nicotinamide adenine dinucleotide, was found to be a potent inhibitor of its activity. The range of concentrations of reduced nicotinamide adenine dinucleotide phosphate over which inhibition occurred was about 100-fold lower than that for adenosine-5'-triphosphate. The data suggest that reduced nicotinamide adenine dinucleotide phosphate may play an important role in regulation of hexose phosphate metabolism inP. multivorans . Antisera prepared against the purified enzyme strongly inhibited its activity, but failed to inhibit the activity of the nicotinamide adenine dinucleotide phosphate-specific glucose-6-phosphate dehydrogenase which is also present in extracts of this bacterium. Immunodiffusion experiments confirmed the results of the enzyme inhibition studies, and failed to support the idea that the two glucose-6-phosphate dehydrogenase species fromP. multivorans represent different oligomeric forms of the same protein.

journal of bacteriology

Purification and Characterization of the <i>Pseudomonas multivorans</i> Glucose-6-Phosphate Dehydrogenase Active with Nicotinamide Adenine Dinucleotide

Purification and Characterization of the Pseudomonas multivorans Glucose-6-Phosphate Dehydrogenase Active with Nicotinamide Adenine Dinucleotide