Download MendeleyTRAIL-R2 Superoligomerization Induced by Human Monoclonal Agonistic Antibody KMTR2
Tamada, T., Shinmi, D., Ikeda, M., Yonezawa, Y., Kataoka, S., Kuroki, R., Mori, E., Motoki, K.(2015) Sci Rep 5: 17936-17936
- PubMed: 26672965
- DOI: https://doi.org/10.1038/srep17936
- Primary Citation of Related Structures:
3X3F, 3X3G - PubMed Abstract:
The fully human monoclonal antibody KMTR2 acts as a strong direct agonist for tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) receptor 2 (TRAIL-R2), which is capable of inducing apoptotic cell death without cross-linking. To investigate the mechanism of direct agonistic activity induced by KMTR2, the crystal structure of the extracellular region of TRAIL-R2 and a Fab fragment derived from KMTR2 (KMTR2-Fab) was determined to 2.1 Å resolution. Two KMTR2-Fabs assembled with the complementarity-determining region 2 of the light chain via two-fold crystallographic symmetry, suggesting that the KMTR2-Fab assembly tended to enhance TRAIL-R2 oligomerization. A single mutation at Asn53 to Arg located at the two-fold interface in the KMTR2 resulted in a loss of its apoptotic activity, although it retained its antigen-binding activity. These results indicate that the strong agonistic activity, such as apoptotic signaling and tumor regression, induced by KMTR2 is attributed to TRAIL-R2 superoligomerization induced by the interdimerization of KMTR2.
Organizational Affiliation:
Quantum Beam Science Center, Japan Atomic Energy Agency, 2-4, Shirakata, Tokai, Ibaraki 319-1195, Japan.
