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. 2025 Oct 10.
doi: 10.1038/s41564-025-02111-7. Online ahead of print.

Dipeptidase 1 is a functional receptor for a porcine coronavirus

Jérémy Dufloo #  1 , Ignacio Fernández #  2 , Atousa Arbabian  2 , Ahmed Haouz  3 , Nigel Temperton  4 , Luis G Gimenez-Lirola  5 , Félix A Rey  6 , Rafael Sanjuán  7
Affiliations

Dipeptidase 1 is a functional receptor for a porcine coronavirus

Jérémy Dufloo et al. Nat Microbiol. .

Abstract

Coronaviruses of the subgenus Embecovirus include several important pathogens, such as the human seasonal coronaviruses HKU1 and OC43, bovine coronavirus and porcine haemagglutinating encephalomyelitis virus (PHEV). While sialic acid is thought to be required for embecovirus entry, protein receptors remain unknown for most of these viruses. Here we show that PHEV does not require sialic acid for entry and instead uses dipeptidase 1 (DPEP1) as a receptor. Cryo-electron microscopy at 3.4-4.4 Å resolution revealed that, unlike other embecoviruses, PHEV displays both open and closed conformations of its spike trimer at steady state. The spike receptor-binding domain (RBD) exhibits extremely high sequence variability across embecoviruses, and we found that DPEP1 usage is specific to PHEV. In contrast, the X-ray structure of the RBD-DPEP1 complex at 2.25 Å showed that the structural elements involved in receptor binding are conserved, highlighting the remarkable versatility of this structural organization in adopting novel receptor specificities.

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Conflict of interest statement

Competing interests: The authors declare no competing interests.

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