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J Bacteriol. 1973 April; 114(1): 28-33
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Pyridine Nucleotide-Dependent Glucose Dehydrogenase Activity in Blue-Green Algae

The University of Texas, Marine Science Institute, Port Aransas, Texas 78373

ABSTRACT

Pyridine nucleotide-dependent glucose dehydrogenase activity (GPND) is described for the first time in cell-free extracts of certain blue-green algae. When glucose is added to these crude cell extracts, nicotinamide adenine dinucleotide phosphate is reduced at twice the rate as nicotinamide adenine dinucleotide; but evidence suggests that this activity is due to a single enzyme. The distribution and level of GPND in selected blue-green algae correlates with the heterotrophic potential of each species. In all blue-green algae where GPND was detected, O₂ uptake coupled to the GPND reaction was also observed. Both GPND and O₂ uptake apparently occur in the soluble fraction of the cell. An essential role for GPND in the heterotrophic metabolism of blue-green algae is postulated.