N. Miyashita coauthored, with O. Habuchi, a 1982 biochemical study distinguishing chondroitin 6-sulfotransferase from chondroitin 4-sulfotransferase in chick embryo cartilage. The activities were separated by size-exclusion chromatography, allowing their properties to be compared in different preparations.[ref]
Separation and characterization of chondroitin 6-sulfotransferase and chondroitin 4-sulfotransferase from chick embryo cartilage by O. Habuchi and N. Miyashita. original byline and Abstract, separation of the two activities
The scientific question concerns position as well as amount. Both enzymes modify chondroitin, but they act at different positions of N-acetylgalactosamine. Equal total group incorporation could therefore conceal different products. Distinguishing the activities gave an experimental way to investigate that structural difference.[ref][ref]
The study also reported removing endogenous acceptors from the enzyme preparations.[ref]
Separation and characterization of chondroitin 6-sulfotransferase and chondroitin 4-sulfotransferase from chick embryo cartilage by O. Habuchi and N. Miyashita. Abstract, acceptor removal
That feature makes the assay logic illuminating: material carried through purification can participate in the measured reaction. Defining the added acceptor is easier when an uncontrolled acceptor pool has been removed. The work thus connects separation of proteins with interpretation of their reaction-specific activity, rather than treating purification as a measurement of protein amount alone. Articles by others on the same topic
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