Catalytic antibody 48G7 (48G7)

Catalytic antibody 48G7 is a well-characterized abzyme that catalyzes the hydrolysis of aryl esters and carbonates (Wedemayer et al., 1997). It was elicited against a phosphonate transition-state analog (TSA), which mimics the tetrahedral intermediate of the hydrolysis reaction (Patten et al., 1996). 48G7 is frequently used as a model system to study the structural and energetic basis of affinity maturation, as the somatic mutations that occur during the immune response significantly increase its catalytic efficiency (Schultz & Lerner, 1995). While not a traditional therapeutic target, catalytic antibodies like 48G7 represent a class of molecules with potential applications in prodrug activation, detoxification, and chemical synthesis. Its study has provided profound insights into how the immune system can evolve protein catalysts from non-catalytic precursors (Wedemayer et al., 1997). The maturation from the germline precursor to the high-affinity 48G7 involves nine somatic mutations that reorganize the active site to better stabilize the transition state (Patten et al., 1996). Related systems have been explored for therapeutic purposes, such as the degradation of cocaine or the site-specific activation of chemotherapy (Schultz & Lerner, 1995).

Other names

Abzyme 48G7Antibody 48G7Esterolytic antibody 48G748G7 IgG

The antibody stabilizes the tetrahedral transition state of ester hydrolysis through a network of hydrogen bonds and electrostatic interactions, primarily involving residues in the complementarity-determining regions (Wedemayer et al., 1997).