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-Structure paper
| タイトル | Structural mechanism of anti-MHC-I antibody blocking of inhibitory NK cell receptors in tumor immunity. |
|---|---|
| ジャーナル・号・ページ | Commun Biol, Year 2026 |
| 掲載日 | 2026年2月2日 |
著者 | Jiansheng Jiang / Abir K Panda / Kannan Natarajan / Haotian Lei / Shikha Sharma / Lisa F Boyd / Reanne R Towler / Sruthi Chempati / Javeed Ahmad / Abraham J Morton / Zabrina C Lang / Yi Sun / Nikolaos Sgourakis / Martin Meier-Schellersheim / Rick K Huang / Ethan M Shevach / David H Margulies / ![]() |
| PubMed 要旨 | Anti-major histocompatibility complex class I (MHC-I) mAbs can stimulate immune responses to tumors and infections by blocking suppressive signals delivered via various immune inhibitory receptors. ...Anti-major histocompatibility complex class I (MHC-I) mAbs can stimulate immune responses to tumors and infections by blocking suppressive signals delivered via various immune inhibitory receptors. To understand such functions, we determined the structure of a highly cross-reactive anti-human MHC-I mAb, B1.23.2, in complex with the MHC-I molecule HLA-B*44:05 by both cryo-electron microscopy (cryo-EM) and X-ray crystallography. Structural models determined by the two methods were essentially identical revealing that B1.23.2 binds a conserved region on the α2 helix that overlaps the killer immunoglobulin-like receptor (KIR) binding site. Structural comparison to KIR/HLA complexes reveals a mechanism by which B1.23.2 blocks inhibitory receptor interactions, leading to natural killer (NK) cell activation. B1.23.2 treatment of the human KLM-1 pancreatic cancer model in humanized (NSG-IL15) mice provides evidence of suppression of tumor growth. Such anti-MHC-I mAb that block inhibitory KIR/HLA interactions may prove useful for tumor immunotherapy. |
リンク | Commun Biol / PubMed:41629525 |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 2.67 - 3.44 Å |
| 構造データ | EMDB-46600, PDB-9d72: EMDB-46601, PDB-9d73: EMDB-46602, PDB-9d74: EMDB-70276, PDB-9oa9: ![]() PDB-8tq6: |
| 由来 |
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キーワード | IMMUNE SYSTEM / histocompatibility complex class I / MHC-I / immune response / immune system Fab / antibody / anti-MHC antibody / cancer tumor / ANTITUMOR PROTEIN/Immune System / anti-mouse-mAb / H2-Dd / M1/42 / anti-MHC-I antibody / anti-tumor / cancer immunotherapy / ANTITUMOR PROTEIN / ANTITUMOR PROTEIN-Immune System complex / anti-human-mAb / B1.23.2 / Fab / HLA |
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