Protective T Cell Responses Featured by Concordant Recognition of Middle East Respiratory Syndrome Coronavirus-Derived CD8+ T Cell Epitopes and Host MHC.Liu, W.J., Lan, J., Liu, K., Deng, Y., Yao, Y., Wu, S., Chen, H., Bao, L., Zhang, H., Zhao, M., Wang, Q., Han, L., Chai, Y., Qi, J., Zhao, J., Meng, S., Qin, C., Gao, G.F., Tan, W.
(2017) J. Immunol. 198: 873-882
- PubMed: 27903740
- DOI: 10.4049/jimmunol.1601542
- Primary Citation of Related Structures:
- PubMed Abstract:
The coordinated recognition of virus-derived T cell epitopes and MHC molecules by T cells plays a pivotal role in cellular immunity-mediated virus clearance. It has been demonstrated that the conformation of MHC class I (MHC I) molecules can be adjus ...
The coordinated recognition of virus-derived T cell epitopes and MHC molecules by T cells plays a pivotal role in cellular immunity-mediated virus clearance. It has been demonstrated that the conformation of MHC class I (MHC I) molecules can be adjusted by the presented peptide, which impacts T cell activation. However, it is still largely unknown whether the conformational shift of MHC I influences the protective effect of virus-specific T cells. In this study, utilizing the Middle East respiratory syndrome coronavirus-infected mouse model, we observed that through the unusual secondary anchor Ile5, a CD8 + T cell epitope drove the conformational fit of Trp 73 on the α1 helix of murine MHC I H-2K d In vitro renaturation and circular dichroism assays indicated that this shift of the structure did not influence the peptide/MHC I binding affinity. Nevertheless, the T cell recognition and the protective effect of the peptide diminished when we made an Ile to Ala mutation at position 5 of the original peptide. The molecular bases of the concordant recognition of T cell epitopes and host MHC-dependent protection were demonstrated through both crystal structure determination and tetramer staining using the peptide-MHC complex. Our results indicate a coordinated MHC I/peptide interaction mechanism and provide a beneficial reference for T cell-oriented vaccine development against emerging viruses such as Middle East respiratory syndrome coronavirus.
State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China.,State Key Laboratory of Respiratory Diseases, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, China; and.,Institute of Laboratory Animal Sciences, Chinese Academy of Medical Sciences and Comparative Medicine Center, Peking Union Medical College, Key Laboratory of Human Disease Comparative Medicine, Ministry of Health, Beijing 100021, China.,Key Laboratory of Medical Virology, Ministry of Health, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.,Department of Pathogenic Biology, Hebei Medical University, Shijiazhuang 050017, China.,Research Network of Immunity and Health, Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing 100101, China.,CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China.,College of Laboratory Medicine and Life Sciences, Institute of Medical Virology, Wenzhou Medical University, Wenzhou 325035, China.,College of Laboratory Medicine and Life Sciences, Institute of Medical Virology, Wenzhou Medical University, Wenzhou 325035, China; email@example.com firstname.lastname@example.org.