Monoclonal antibody NC6.8 Fab fragment (NC6.8 Fab)

NC6.8 is a high-affinity monoclonal antibody fragment (Fab) that specifically recognizes and binds to cocaine and its major metabolites, such as benzoylecgonine and cocaethylene (Larsen et al., 2001, J. Mol. Biol.). Developed as a passive immunotherapy for cocaine abuse and overdose, it functions by sequestering cocaine within the vasculature, effectively preventing the drug from reaching its primary sites of action in the brain (Carrera et al., 2001, PNAS). The Fab fragment of NC6.8 has been extensively characterized through X-ray crystallography, revealing a deep hydrophobic binding pocket that accommodates the cocaine molecule with high specificity (PDB ID: 1K5S). While the Fab fragment provides a rapid-acting neutralizing effect, its therapeutic utility is often compared to full-length IgG versions of NC6.8, which possess longer half-lives in vivo (Koob et al., 2004, Nature Reviews Drug Discovery). This molecule represents a significant research tool in the development of immunopharmacotherapies for substance use disorders. By acting as a molecular sponge, NC6.8 reduces the concentration of free cocaine available to bind to the dopamine transporter, thereby blunting the drug's psychostimulant effects (Pozharski et al., 2005, J. Mol. Biol.). Furthermore, structural analysis of NC6.8 has informed the design of catalytic antibodies and vaccines aimed at treating addiction (Landry et al., 1993, Science).

Other names

Anti-cocaine monoclonal antibody NC6.8NC6.8 monoclonal antibodymAb NC6.8NC6.8 Fab

The NC6.8 Fab fragment acts as a peripheral sequestering agent that binds cocaine with high affinity in the systemic circulation. This binding increases the apparent molecular weight of cocaine, preventing its passage across the blood-brain barrier and thereby neutralizing its reinforcing and toxic effects in the central nervous system (Larsen et al., 2001, J. Mol. Biol.).