gamma-Glutamyl transferase isoenzymes in human bile.

Abstract
The .gamma.-glutamyl transferase [EC 2.3.2.2] isoenzymes of human bile were studied using electrophoretic, gel filtration and ultracentrifugation techniques. The effects of butanol extraction were investigated. The presence of 4 isoenzymes of .gamma.-glutamyl transferase in bile, differing in electrophoretic mobilities, molecular size and density were found. The correlation between the properties of biliary .gamma.-glutamyl transferase and of alkaline phosphatase is discussed.