Transition state analogs are described which may be used to elicit antibodies that catalyze the conversion of asparagine to aspartic acid. Synthetic schemes are disclosed for making the transition state analogs which can than be attached to a carrier molecule to form an immunoconjugate. Immunoconjugates can be administered to an animal for the purpose of raising antibodies. Antibodies can in turn be used in pharmaceutical compositions which can be given to patients as part of a method of treating various conditions, particularly cancer.
The synthesis of the first two haptensdesigned to elicit catalytic hydrolytic antibodies for the dynamic kinetic resolution of racemic 4-substituted 4H-oxazolin-5-ones is reported. A cyclic phosphinate and a 2,5-dihydro-1H-pyrrolium derivative were chosen as “first generation” haptens. The cyclic phosphinate was designed to mimic the higher energy transition state along the reaction coordinate for
Antibody-Catalyzed Rearrangement of a Peptide Bond: Mechanistic and Kinetic Investigations
作者:Louis J. Liotta、Richard A. Gibbs、Scott D. Taylor、Patricia A. Benkovic、Stephen J. Benkovic
DOI:10.1021/ja00122a001
日期:1995.5
Catalysis of the deamidation of asparagine residues may provide a powerful method for the deactivation of proteins. Catalytic antibodies (Gibbs et al. Science 1992, 258, 803) have been induced that catalyze the deamidation of a model dipeptide through an intermediate succinimide. Investigations of the mechanistic characteristics of two such antibodies, RG2-23C7 and RG2-2E4, revealed their ability to accelerate the hydrolysis of either the R- or S-enantiomers of the succinimide by factors of 10-500-fold to yield differing ratios of the aspartate and isoaspartate products. The mixed product ratios imply that two tetrahedral binding sites of unequal effectiveness were induced in response to the tetrahedral mimics (a phosphinate or secondary hydroxyl) within the hapten structure. The antibody RG2-2E4 also catalyzes the deamidation of either the D- or L-asparagine within the dipeptide through the intermediate cyclic imide, resulting in a multistep reaction sequence featuring a series of tetrahedral transition states. pH-rate profiles do not implicate functional groups within the antibodies' combining sites for either the deamidation or hydrolytic reactions. The strategy of bifunctional or higher order transition state mimics should provide a route to developing catalytic antibodies for reactions requiring multistep processing.
A Highly Efficient and Practical Synthesis of Cyclic Phosphinates Using Ring-Closing Metathesis