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| Title | Scavenger receptor CD163 multimerises to allow uptake of diverse ligands. |
|---|---|
| Journal, issue, pages | Nat Commun, Vol. 16, Issue 1, Page 6623, Year 2025 |
| Publish date | Jul 18, 2025 |
Authors | Richard X Zhou / Matthew K Higgins / ![]() |
| PubMed Abstract | CD163 is an archetypal scavenger receptor and mediates detoxification of free haemoglobin. Release of haemoglobin from lysed erythrocytes causes oxidative tissue and organ damage. Detoxification ...CD163 is an archetypal scavenger receptor and mediates detoxification of free haemoglobin. Release of haemoglobin from lysed erythrocytes causes oxidative tissue and organ damage. Detoxification involves haemoglobin binding to the abundant serum protein haptoglobin, followed by CD163-mediated uptake of stoichiometrically diverse haptoglobin-haemoglobin complexes into macrophages for degradation. We show that CD163 adopts dimeric and trimeric assemblies due to calcium-mediated interactions within a membrane-associated base. Arms protrude from this base and create a ligand-binding site. Flexibility within the base, coupled with multiple small ligand-binding surfaces on each arm, allow the receptor to mould around its ligands, resulting in promiscuous uptake of ligands with different structures and stoichiometries. Monomeric CD163 lacks this ability to internalise lower-avidity ligands. Arms from adjacent protomers can also self-associate, blocking ligand-binding surfaces in an autoinhibited state. Therefore, through calcium-dependent multimer formation and flexible ligand binding, CD163 scavenges ligands with different structures and avidities, mediating haemoglobin detoxification. |
External links | Nat Commun / PubMed:40681524 / PubMed Central |
| Methods | EM (single particle) |
| Resolution | 2.82 - 3.81 Å |
| Structure data | EMDB-52078, PDB-9hej: EMDB-52079, PDB-9hek: EMDB-52080, PDB-9hel: ![]() EMDB-52081: Unliganded trimeric CD163 with arm-arm interactions ![]() EMDB-52082: Unliganded trimeric CD163 with disordered arms |
| Chemicals | ![]() ChemComp-NAG: ![]() ChemComp-CA: ![]() ChemComp-HEM: ![]() ChemComp-OXY: |
| Source |
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Keywords | ENDOCYTOSIS / CD163 / haptoglobin-haemoglobin complex / haemoglobin detoxification / ligand uptake / scavenger receptor / SRCR domain-containing protein |
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homo sapiens (human)
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