Properties of a new form of glucose-6-phosphate dehydrogenase (G6PD) from erythrocytes, called Kaluga, are described. The enzyme was isolated from erythrocytes of a patient with chronic non-spherocytic hemolytic anemia; in the blood cells 20% of the G6PD activity was maintained as compared with normal state. The partially purified enzyme was shown to be unstable in electrophoresis, it possessed a biphase type of pH-optima; Km value for NADP was decreased for glucose-6-phosphate Km value was normal. The thermostability of G6PD was normal at 46 within 1 hr.

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