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Identification of a novel linear B-cell epitope in porcine deltacoronavirus nucleocapsid protein

ABSTRACT: Porcine deltacoronavirus (PDCoV) is an emerging swine enteropathogenic coronavirus that caused diarrhea and/or vomiting in neonatal piglets worldwide. Coronaviruses nucleocapsid (N) protein is the most conserved structural protein for viral replication and possesses good antigenicity. In t...

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Detalles Bibliográficos
Autores principales: He, Wei, Shi, Xinze, Guan, Haifei, Zou, Yuntong, Zhang, Shengkun, Jiang, Zhiwen, Su, Shuo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9813470/
https://www.ncbi.nlm.nih.gov/pubmed/36602561
http://dx.doi.org/10.1007/s00253-022-12348-5
Descripción
Sumario:ABSTRACT: Porcine deltacoronavirus (PDCoV) is an emerging swine enteropathogenic coronavirus that caused diarrhea and/or vomiting in neonatal piglets worldwide. Coronaviruses nucleocapsid (N) protein is the most conserved structural protein for viral replication and possesses good antigenicity. In this study, three monoclonal antibodies (mAbs), 3B4, 4D3, and 4E3 identified as subclass IgG2aκ were prepared using the lymphocytic hybridoma technology against PDCoV N protein. Furthermore, the B-cell epitope recognized by mAb 4D3 was mapped by dozens of overlapping truncated recombinant proteins based on the western blotting. The polypeptide (28)QFRGNGVPLNSAIKPVE(44) (EP-4D3) in the N-terminal of PDCoV N protein was identified as the minimal linear epitope for binding mAb 4D3. And the EP-4D3 epitope’s amino acid sequence homology study revealed that PDCoV strains are substantially conserved, with the exception of the Alanine(43) substitution Valine(43) in the China lineage, the Early China lineage, and the Thailand, Vietnam, and Laos lineage. The epitope sequences shared high similarity (94.1%) with porcine coronavirus HKU15-155 (PorCoV HKU15), Asian leopard cats coronavirus (ALCCoV), sparrow coronavirus HKU17 (SpCoV HKU17), and sparrow deltacoronavirus. In contrast, the epitope sequences shared a very low homology (11.8 to 29.4%) with other porcine CoVs (PEDV, TGEV, PRCV, SADS-CoV, PHEV). Overall, the study will enrich the biological function of PDCoV N protein and provide foundational data for further development of diagnostic applications. KEY POINTS: • Three monoclonal antibodies against PDCoV N protein were prepared. • Discovery of a novel B-cell liner epitope ((28)QFRGNGVPLNSAIKPVE(44)) of PDCoV N protein. • The epitope EP-4D3 was conserved among PDCoV strains. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00253-022-12348-5.