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-Structure paper
| タイトル | Calcium-dependent oligomerization of scavenger receptor CD163 facilitates the endocytosis of ligands. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 6679, Year 2025 |
| 掲載日 | 2025年7月21日 |
著者 | Hua Xu / Xiaohui Song / Xiao-Dong Su / ![]() |
| PubMed 要旨 | Scavenger receptor CD163 is a marker of M2 type macrophages that play important roles in anti-inflammatory processes. The most extensively studied function of CD163 is related to the elimination of ...Scavenger receptor CD163 is a marker of M2 type macrophages that play important roles in anti-inflammatory processes. The most extensively studied function of CD163 is related to the elimination of hemoglobin-haptoglobin (Hb-Hp) complexes, to prevent potential oxidative toxicity of the iron-containing heme. However, the structural mechanism of CD163 in ligand binding and internalization remains elusive. Here, we present the cryo-electron microscopy structure of human Hb-Hp recognition by the full ectodomain of CD163. We illuminate that CD163 forms calcium-dependent oligomers and primarily exists as trimeric form under the condition of 2.5 mM calcium. It mainly utilizes two protomers to interact with Hb-Hp complex asymmetrically, while the third protomer of the trimer also has the potential to form calcium-mediated contacts with Hp. Flow cytometry analyses reveal that oligomerization of CD163 significantly enhances the efficiency of ligand endocytosis. These results advance our understanding of the role of CD163 in ligand scavenging. |
リンク | Nat Commun / PubMed:40691148 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.94 - 3.21 Å |
| 構造データ | EMDB-38480, PDB-8xmk: EMDB-38485, PDB-8xmp: EMDB-38486, PDB-8xmq: EMDB-38490, PDB-8xmw: |
| 化合物 | ![]() ChemComp-NAG: ![]() ChemComp-CA: ![]() ChemComp-HEM: |
| 由来 |
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キーワード | ENDOCYTOSIS / Homotrimer / receptor / scavenger receptor / ligand binding / EXOCYTOSIS |
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homo sapiens (ヒト)
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