A new variant of G-6-PD with favism has been detected in a German family. After partial purification the enzyme was biochemically characterized. It revealed normal electrophoretic mobility, normal thermostability and a flat pH-activity curve. The Km-value for G-6-P was reduced, whereas this value was normal for NADP. The substrate analogues 2-desoxy G-6-P, Gal-6-p and deamino-NADP were utilized to increased rates. The biochemical data were compatible with the benign clinical course.

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