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<p>T cells play a crucial role in clearing SARS-CoV-2 and in forming long-term memory responses to that coronavirus. The highly immunogenic nucleocapsid (N) protein of SARS-CoV-2 is much more conserved than the spike (S) protein across variants of concern, making it an attractive vaccine target for activating cytotoxic CD8<sup>+</sup> T cells. Of particular interest are the immunodominant N epitopes LLL and SPR. Whereas LLL elicits a clonally restricted T cell response, the response to SPR is highly diverse. To understand the basis for this difference, here we determine structures of T cell receptors (TCRs) bound to LLL–HLA-A2 and SPR–HLA-B7, revealing the structural underpinnings of highly restricted Vα gene usage by LLL-specific TCRs, as well as multiple structural solutions to recognizing SPR and thereby generating a clonally diverse T cell response to that epitope. These structures also provide frameworks for understanding T cell recognition of SARS-CoV-2 variants and other coronaviruses. Finally, we compare the X-ray structures of TCR–LLL–HLA-A2 and TCR–SPR–HLA-B7 complexes with models predicted by multiple versions of AlphaFold, highlighting some success while showing room for improvement. Overall, our findings expand understanding of coronavirus T cell recognition, informing vaccine design and advances in computational modeling approaches.</p>

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Structural insights into clonal restriction and diversity in T cell recognition of two immunodominant SARS-CoV-2 nucleocapsid epitopes

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月10日

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  • Ping Yuan,
  • Guodong Chen,
  • Yukun Li,
  • Xichun Liu,
  • Shayana Saravanakumar,
  • Jianfeng Zhao,
  • Qianyu Ji,
  • Hong Wang,
  • Ying-Wu Lin,
  • Mostafa Elbahnasawy,
  • Nan-Ping Weng,
  • Brian G. Pierce,
  • Roy A. Mariuzza,
  • Daichao Wu

摘要

T cells play a crucial role in clearing SARS-CoV-2 and in forming long-term memory responses to that coronavirus. The highly immunogenic nucleocapsid (N) protein of SARS-CoV-2 is much more conserved than the spike (S) protein across variants of concern, making it an attractive vaccine target for activating cytotoxic CD8+ T cells. Of particular interest are the immunodominant N epitopes LLL and SPR. Whereas LLL elicits a clonally restricted T cell response, the response to SPR is highly diverse. To understand the basis for this difference, here we determine structures of T cell receptors (TCRs) bound to LLL–HLA-A2 and SPR–HLA-B7, revealing the structural underpinnings of highly restricted Vα gene usage by LLL-specific TCRs, as well as multiple structural solutions to recognizing SPR and thereby generating a clonally diverse T cell response to that epitope. These structures also provide frameworks for understanding T cell recognition of SARS-CoV-2 variants and other coronaviruses. Finally, we compare the X-ray structures of TCR–LLL–HLA-A2 and TCR–SPR–HLA-B7 complexes with models predicted by multiple versions of AlphaFold, highlighting some success while showing room for improvement. Overall, our findings expand understanding of coronavirus T cell recognition, informing vaccine design and advances in computational modeling approaches.