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1. The preparation of enzymically active N-citraconyl derivatives of fructose diphosphate aldolase from rabbit muscle is described. Reaction is restricted to amino groups and the derivatives are not very heterogeneous with respect to the number of substituents. 2. Linear double-reciprocal plots of enzyme velocity against substrate concentration are found up to about 15% blocking of amino groups. With more than 15% blocking, there is a marked downward curvature in the double-reciprocal plots at high substrate concentrations. 3. Over the range 0-25% blocking of amino groups the apparent V(max.) for fructose diphosphate falls to 10% that of the native enzyme, and the apparent K(m) rises from 1 to 400mum. 4. Various pieces of evidence suggest that citraconyl-aldolase is slightly distorted in structure compared with the native enzyme. However, the kinetic properties and tetrameric structure of citraconyl-aldolase can be completely recovered after denaturation in 4m-guanidine hydrochloride. 5. After removal of the citraconyl groups in acid conditions the kinetic and molecular properties of native enzyme are restored. 6. Hybrid forms of aldolase can be constructed containing native and citraconylated subunits and the suitability of these derivatives for the study of subunit interactions in the enzyme is discussed. 7. The kinetic properties of hybridized aldolase containing native and citraconylated subunits are not exactly those predicted from the kinetic properties of the two parental forms. This result is interpreted in terms of conformational changes induced in the native and modified subunits when both are present in a hybrid molecule, evidently as a result of interactions in the tetramer.

Kinetic and molecular properties of citraconyl-aldolase. The reversible denaturation and hybridization of the native and modified enzymes