The alkaline pH dependence of chymotrypsin reactions: postulation of a pH-dependent intramolecular competitive inhibition.

Abstract
The inactivity of chymotrypsinogen may be related to the intramolecular competitive inhibition described here. In the zymogen, the intramolecular competitive inhibitor would presumably be the elements of the dipeptide later removed rather than the N-terminal isoleucine or other group in the free enzyme, but the principle may be the same.