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.
Clark et al., Journal of the Chemical Society, 1958, p. 3283,3286
作者:Clark et al.
DOI:——
日期:——
NOUVEAUX DERIVES DE DIPEPTIDES, LEUR PROCEDE DE PREPARATION ET LEUR EMPLOI COMME MEDICAMENT
申请人:FLORK, Michel
公开号:EP0083612A1
公开(公告)日:1983-07-20
[EN] NEW DERIVATIVES OF DIPEPTIDES, METHOD FOR THE PREPARATION THEREOF AND UTILIZATION THEREOF AS DRUGS
申请人:FLORK, Michel
公开号:WO1983000146A1
公开(公告)日:1983-01-20
(EN) Dipeptide derivatives represented by the general formula Ac - A - X - Y, wherein Ac represents the acyl rest of an organic carboxylic acid. A is an amino acid carrying a carboxylic function at $g(a). X is an amino acid rest and Y is hydrogen or the rest of a mono- or disubstituted amine. They are prepared by acetylation of the amino acid A and then by dihydration of the N-acetyl amino acid into anhydride, coupling with an X amino acid, new dihydration of the dipeptide N-acetyl A-X into anhydride-amide and condensation with a Y amine to form the dipeptide Ac - A - X - Y.(FR) Dérivés de dipeptides répondant à la formule générale Ac - A - X - Y dans laquelle Ac représente le reste acyle d'un acide organique carboxylique. A est un amino acide porteur d'une fonction carboxylique en $g(a). X est un reste d'amino acide et Y est l'hydrogène ou le reste d'une amine mono- ou di-substituée. On les prépare par acetylation de l'amino acide A puis deshydratation du N-acetyl amino acide en anhydride, couplage avec un amino acide X, nouvelle deshydratation du dipeptide N-acetyl A-X en anhydride-imide puis condensation avec une amine Y pour former le dipeptide Ac - A - X - Y.