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TitleA dual-receptor checkpoint primes enterovirus D68 for respiratory cell entry.
Journal, issue, pagesNat Commun, Vol. 17, Issue 1, Year 2026
Publish dateJul 23, 2026
AuthorsShengjian Liang / Haoran Guo / Zhili Xu / Zan Liu / Wanying Yang / Xiaoke Liu / Zhenyu Wei / Jichao Hou / Wei Huang / Wei Wang / Jiachen Li / Wendong Ma / Zhikang Deng / Haocong Qian / Yaxin Wang / Jialin Liu / Zihe Rao / Wei Wei / Zhiyong Lou /
PubMed AbstractMFSD6 is a newly identified receptor that mediates the invasion of respiratory cells by enterovirus D68 (EV-D68), a non-polio enterovirus that causes severe respiratory disease and poliomyelitis-like ...MFSD6 is a newly identified receptor that mediates the invasion of respiratory cells by enterovirus D68 (EV-D68), a non-polio enterovirus that causes severe respiratory disease and poliomyelitis-like illness in children. Here, we report near-atomic-resolution cryo-electron microscopy (cryo-EM) structures of historical and contemporary AFM-associated EV-D68 strains, together with their complexes bound to the third extracellular loop of MFSD6 (MFSD6-L3). These structures uncover a previously unrecognized "binary gating switch" mechanism of virus-receptor engagement that differs from the reported model. In this mechanism, the N200-V208 segment of MFSD6, carrying a glycosylated Asn207, inserts into one capsomer, whereas the sialyl-Gal-terminated glycan of MFSD6 engages an adjacent capsomer. Neu5Ac binding induces conformational rearrangements that expel the pocket factor, destabilize the virion, and prime infection. Functional analyses further define the contributions of the receptor-contacting residues and glycans to viral attachment and entry. Together, our findings refine the molecular basis of EV-D68 recognition of MFSD6 and reveal a glycan-mediated dual-lock mechanism that may enhance receptor specificity, prevent premature uncoating, and ensure productive infection only upon engagement of the correct host receptor. These results provide broader insight into enterovirus tropism and establish a framework for structure-guided antiviral design.
External linksNat Commun / PubMed:42637770 / PubMed Central
MethodsEM (single particle)
Resolution2.0 - 3.21 Å
Structure data

EMDB-65371, PDB-9vv0:
CryoEM structure of EV-D68 strain Fermon in complex with MFSD6-L3
Method: EM (single particle) / Resolution: 2.23 Å

EMDB-65502, PDB-9w0d:
CryoEM structure of procapsid in EV-D68:MFSD6-L3
Method: EM (single particle) / Resolution: 3.17 Å

EMDB-65503, PDB-9w0e:
CryoEM structure of B-particle in EV-D68:MFSD6-L3
Method: EM (single particle) / Resolution: 2.93 Å

EMDB-65505, PDB-9w0i:
CryoEM structure of EV-D68 strain Fermon in complex with MFSD6-L3-N207A
Method: EM (single particle) / Resolution: 2.19 Å

EMDB-65506, PDB-9w0j:
CryoEM structure of EV-D68 strain Fermon in complex with MFSD6-L3-S209A
Method: EM (single particle) / Resolution: 2.09 Å

EMDB-65507, PDB-9w0k:
CryoEM structure of EV-D68 strain Fermon in complex with MFSD6-R196-L226-NAtreat
Method: EM (single particle) / Resolution: 2.29 Å

EMDB-65590, PDB-9w34:
CryoEM structure of EV-D68 strain Fermon procapsid
Method: EM (single particle) / Resolution: 3.21 Å

EMDB-65640, PDB-9w4o:
CryoEM structure of EV-D68 strain Fermon mature virion
Method: EM (single particle) / Resolution: 2.52 Å

EMDB-65646, PDB-9w4y:
CryoEM structure of EV-D68 strain Fermon in complex with MFSD6-R196-L226
Method: EM (single particle) / Resolution: 2.0 Å

EMDB-68820, PDB-23ay:
CryoEM structure of EV-D68 US/MO/14-18947 mature virion
Method: EM (single particle) / Resolution: 2.27 Å

EMDB-68830, PDB-23bg:
CryoEM structure of EV-D68 US/MO/14-18947 in complex with MFSD6-L3
Method: EM (single particle) / Resolution: 2.47 Å

EMDB-68851, PDB-23bx:
CryoEM structure of EV-D68 US/KY/14-18953 mature virion
Method: EM (single particle) / Resolution: 2.62 Å

EMDB-69155, PDB-23ps:
CryoEM structure of EV-D68 US/KY/14-18953 in complex with MFSD6-L3
Method: EM (single particle) / Resolution: 2.65 Å

Chemicals

ChemComp-SPH:
SPHINGOSINE

Source
  • enterovirus d68
  • homo sapiens (human)
KeywordsVIRUS / EV-D68 / MFSD6 / VIRAL PROTEIN / procapsid / B-particle

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