[The mechanism of action of chorionic gonadotropin on lactate dehydrogenase activity].

The purpose of this report is to demonstrate that chorionic gonadotropin (CG) interacts nonspecifically with lactate dehydrogenase changing its catalytic activity. The binding in vitro of CG (5 mg/ml) to the enzyme is accompanied by conformational changes of its protein and kinetic characteristics. It may be possible that chorionic gonadotropin exercises a controlling influence on lactate dehydrogenase activity in the cell.