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-Structure paper
| タイトル | Structural basis of calcium-dependent C1ql1/BAI3 assemblies in synaptic connectivity. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 11444, Year 2025 |
| 掲載日 | 2025年12月10日 |
著者 | Liangyu Liao / Ying Han / Fengfeng Niu / Yingjie Wang / Yang Lu / Shun Xu / Houming Zhu / Leishu Lin / Jinman Xiao / Hoi In Tou / Jiali Gao / Bo Zhang / Zhiyi Wei / ![]() |
| PubMed 要旨 | Cell adhesion molecules (CAMs) are pivotal in establishing and maintaining synaptic connectivity. Emerging evidence indicates that some secreted factors within the synaptic cleft, including C1q-like ...Cell adhesion molecules (CAMs) are pivotal in establishing and maintaining synaptic connectivity. Emerging evidence indicates that some secreted factors within the synaptic cleft, including C1q-like proteins (C1qls), play a crucial role in bridging pre- and post-synapses by connecting the bilateral CAMs. However, the mechanisms of those secreted factors in synapse assembly remain incomplete. Here, we explore C1ql-mediated synaptic connectivity, focusing on the assembly of C1ql1 and its postsynaptic receptor brain-specific angiogenesis inhibitor 3 (BAI3, also called ADGRB3). Our biochemical, structural, and computational analyses reveal that the trimeric globular C1q (gC1q) domain of C1ql1 undergoes a calcium-modulated domain-swapping event to form a hexamer. Cryo-EM study manifests the stabilizing role of calcium ions on the C1ql1_gC1q hexamer in complex with the extended CUB domain of BAI3. Using the gC1q hexamer, full-length C1ql1 further assembles into linear clusters, possibly providing a scaffold to accumulate BAI3 receptors on the plasma membrane. Our cellular and in vivo studies support a role for the gC1q-mediated dynamic assembly of C1ql1 in receptor accumulation and synapse maintenance. Collectively, our findings provide a plausible mechanism of secreted factor-mediated synaptic connectivity, driven by the calcium-modulated assembly of C1qls and their interactions with CAMs. |
リンク | Nat Commun / PubMed:41372137 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 2.22 - 3.48 Å |
| 構造データ | EMDB-63181, PDB-9lkl: EMDB-63182, PDB-9lkm: ![]() PDB-9lkk: |
| 化合物 | ![]() ChemComp-CA: ![]() ChemComp-CAC: ![]() ChemComp-GOL: ![]() ChemComp-CL: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | SIGNALING PROTEIN / C1ql1 / synapse / CF-PC / Calcium / secreted protein / BAI3 |
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