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Antibody and inhibitor interactions with pronase trypsin.

Antibody to pronase trypsin reacts with its antigenic sites to the same extent whether the enzyme is in a soluble complex with its inhibitor or whether it is free. On the other hand, the inhibitor reacts poorly with the antibody-bound enzyme. Excess of antibody displaces the insoluble inhibitor from its complex with the enzyme. This displacement effect is greater when the inhibitor is bound to agarose by means of cyanogen-bromide treatment rather than by means of ethylene-diamine-glutaraldehyde. It is assumed therefore that there is competition between the antibody and the inhibitor for the plane tangent to the active site of the enzyme, but not for the active site itself or for its immediate vicinity.