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-Structure paper
タイトル | Structure and assembly of the human IL-12 signaling complex. |
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ジャーナル・号・ページ | Structure, Vol. 32, Issue 10, Page 1640-11651.e5, Year 2024 |
掲載日 | 2024年10月3日 |
著者 | Huiqin Chen / Xiaofei Ge / Chun Li / Jianwei Zeng / Xinquan Wang / |
PubMed 要旨 | Interleukin (IL)-12 is a heterodimeric pro-inflammatory cytokine. Our cryoelectron microscopy structure determination of human IL-12 in complex with IL-12Rβ1 and IL-12Rβ2 at a resolution of 3. ...Interleukin (IL)-12 is a heterodimeric pro-inflammatory cytokine. Our cryoelectron microscopy structure determination of human IL-12 in complex with IL-12Rβ1 and IL-12Rβ2 at a resolution of 3.75 Å reveals that IL-12Rβ2 primarily interacts with the IL-12p35 subunit via its N-terminal Ig-like domain, while IL-12Rβ1 binds to the p40 subunit with its N-terminal fibronectin III domain. This binding mode of IL-12 with its receptors is similar to that of IL-23 but shows notable differences with other cytokines. Through structural information and biochemical assays, we identified Y62, Y189, and K192 as key residues in IL-12p35, which bind to IL-12Rβ2 with high affinity and mediate IL-12 signal transduction. Furthermore, structural comparisons reveal two distinctive conformational states and structural plasticity of the heterodimeric interface in IL-12. As a result, our study advances our understanding of IL-12 signal initiation and opens up new opportunities for the engineering and therapeutic targeting of IL-12. |
リンク | Structure / PubMed:39111304 |
手法 | EM (単粒子) |
解像度 | 3.57 - 3.75 Å |
構造データ | EMDB-38609, PDB-8xrp: EMDB-39311, PDB-8yi7: |
化合物 | ChemComp-NAG: |
由来 |
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キーワード | CYTOKINE / IL-12 / IL-12RB1 / IL-12RB2 / receptor complex |