Natalizumab binder sig specifikt til α4β1 integrinet og blokerer derved interaktionen med dets kognate receptor, vaskulært celleadhæsionsmolekyle- 1 (VCAM- 1) og ligand osteopontin, og et variant domæne (alternatively spliced) af fibronektin, connecting segment- 1 (CS- 1).
Specifically, natalizumab binds to the α 4β 1 integrin, blocking the interaction with its cognate receptor, vascular cell adhesion molecule-1 (VCAM-1), and ligands osteopontin, and an alternatively spliced domain of fibronectin, connecting segment-1 (CS-1).