Catalytic antibody 17E8 (17E8)

Catalytic antibody 17E8 is a monoclonal antibody engineered to function as an enzyme, specifically catalyzing the hydrolysis of phenyl esters. It was elicited using a phosphonate transition-state analog, which induces an active site complementary to the high-energy tetrahedral intermediate of the reaction (Zhou et al., 1994; Science 265:1059-1064). Structurally, the 17E8 active site mimics the catalytic strategy of natural serine proteases, employing a triad-like arrangement of residues to facilitate nucleophilic attack. The antibody demonstrates high substrate specificity and significant rate acceleration compared to uncatalyzed reactions. While 17E8 is not a traditional therapeutic target found in human physiology, it is a vital tool in structural biology and protein engineering. It provides insights into how the immune system can be harnessed to create bespoke catalysts for chemical transformations. Potential applications of such abzymes include the selective activation of prodrugs or the detoxification of exogenous substances. The study of 17E8 has been fundamental in defining the limits and capabilities of antibody-mediated catalysis (Thayer et al., 1995; J. Mol. Biol. 251:253-269).

Other names

Abzyme 17E8Antibody 17E817E8 active site

The antibody stabilizes the tetrahedral transition state of ester hydrolysis using a mechanism that mimics serine proteases, involving a catalytic triad-like residue arrangement (Zhou et al., 1994).