Download MendeleyStructural insights into IL-31 signaling inhibition by a neutralizing antibody.
Guo, T., Zheng, Y., Fan, Z., Liu, P., Chai, Y., Liao, X., Zhang, C., Pang, X., Li, D., Gao, F., Xiao, H.(2025) Structure
- PubMed: 41015037
- DOI: https://doi.org/10.1016/j.str.2025.09.002
- Primary Citation of Related Structures:
9UK5, 9VP0 - PubMed Abstract:
Interleukin-31 (IL-31) signals through the IL-31 receptor alpha (IL-31RA) and oncostatin M receptor beta (OSMRβ) heterodimer, mediating pruritus, dermatitis, inflammatory responses, neuroimmune interactions, and certain cancers. Here, we present the crystal structure of canine IL-31 (cIL-31) in complex with a neutralizing caninized monoclonal antibody (2D10-2). This antibody competitively inhibited cIL-31 binding to canine OSMRβ (cOSMRβ) but not to canine IL-31RA (cIL-31RA). Moreover, it effectively blocked cIL-31-induced STAT5 phosphorylation in vitro and alleviated cIL-31-induced pruritus in beagle dogs. Structural analysis identified key antibody-binding residues in α-helical A, α-helical D, and the AB loop of cIL-31. Systematic mutagenesis based on the complex structure further defined the conformational epitopes of cIL-31 recognized by cOSMRβ. In summary, this study reports the IL-31 structure, revealing a four-α-helical bundle cytokine, and elucidates 2D10-2's neutralizing mechanism by targeting the cIL-31-cOSMRβ interaction. These findings advance our understanding of IL-31 and offer insights for developing IL-31-targeted therapeutics.
- Laboratory of Protein Engineering and Vaccines, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
Organizational Affiliation:
