Transamidase reactions involved in the enzymic coagulation of semen: isolation of -glutamyl- -lysine dipeptide from clotted secretion protein of guinea pig seminal vesicle.

Abstract

New supportive evidence is advanced in favor of the hypothesis that the enzymic coagulation of guinea pig semen involves transamidase reactions that result in the formation of gamma-glutamyl-epsilon-lysine intermolecular cross linkages between molecules of a basic protein in seminal vesicle secretion. The dipeptide gamma-glutamyl-epsilon-lysine was isolated in large quantities from proteolytic digests of the coagulated basic vesicular secretion protein that comprises the seminal clot.