Abstract
Human plasma α-galactosidase A (α-D-galactoside galactohydrolase, EC 3.2.1.22) was purified 7000-fold over plasma levels from Cohn Fraction IV-1. The yield per kg starting material averaged 11 000 units (nmol galactose liberated per h) and the specifc activity was about 600 units per mg protein with 4-methylumbelliferyl-α-D-galactoside. The ratio of 4-methylumbelliferyl-α-galactosidase to ceramide trihexosidase activities was 6.2. Both activities were heat labile and exhibited the same relative mobilities on polyacrylamide gel electrophoresis. Enzymatic activity was stable for at least 4 months at 4 and −20°C. The endotoxin concentration of this preparation averaged 0.26 mg per mg protein.
Published Version
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