7ENO
Mutant strain M3 of foot-and-mouth disease virus type O
Summary for 7ENO
| Entry DOI | 10.2210/pdb7eno/pdb |
| EMDB information | 31218 |
| Descriptor | VP1 of O type FMDV capsid, VP2 of O type FMDV capsid, VP3 of O type FMDV capsid, ... (4 entities in total) |
| Functional Keywords | fmdv, virus |
| Biological source | Foot-and-mouth disease virus - type O More |
| Total number of polymer chains | 4 |
| Total formula weight | 80419.17 |
| Authors | |
| Primary citation | Dong, H.,Lu, Y.,Zhang, Y.,Mu, S.,Wang, N.,Du, P.,Zhi, X.,Wen, X.,Wang, X.,Sun, S.,Zhang, Y.,Guo, H. A Heat-Induced Mutation on VP1 of Foot-and-Mouth Disease Virus Serotype O Enhanced Capsid Stability and Immunogenicity. J.Virol., 95:e0017721-e0017721, 2021 Cited by PubMed Abstract: Foot-and-mouth disease (FMD) is a highly contagious viral disease affecting cloven-hoofed animals that causes a significant economic burden globally. Vaccination is the most effective FMD control strategy. However, FMD virus (FMDV) particles are prone to dissociate when appropriate physical or chemical conditions are unavailable, such as an incomplete cold chain. Such degraded vaccines result in compromised herd vaccination. Therefore, thermostable FMD particles are needed for use in vaccines. This study generated thermostable FMDV mutants (M3 and M10) by serial passages at high temperature, subsequent amplification, and purification. Both mutants contained an alanine-to-threonine mutation at position 13 in VP1 (A1013T), although M3 contained 3 additional mutations. The selected mutants showed improved stability and immunogenicity in neutralizing antibody titers, compared with the wild-type (wt) virus. The sequencing analysis and cryo-electron microscopy showed that the mutation of alanine to threonine at the 13th amino acid in the VP1 protein (A1013T) is critical for the capsid stability of FMDV. Virus-like particles containing A1013T (VLP) also showed significantly improved stability to heat treatment. This study demonstrated that Thr at the 13th amino acid of VP1 could stabilize the capsid of FMDV. Our findings will facilitate the development of a stable vaccine against FMDV serotype O. Foot-and-mouth disease (FMD) serotype O is one of the global epidemic serotypes and causes significant economic loss. Vaccination plays a key role in the prevention and control of FMD. However, the success of vaccination mainly depends on the quality of the vaccine. Here, the thermostable FMD virus (FMDV) mutants (M3 and M10) were selected through thermal screening at high temperatures with improved stability and immunogenicity compared with the wild-type virus. The results of multisequence alignment and cryo-electron microscopy (cryo-EM) analysis showed that the Thr substitution at the 13th amino acid in the VP1 protein is critical for the capsid stability of FMDV. For thermolabile type O FMDV, this major discovery will aid the development of its thermostable vaccine. PubMed: 34011545DOI: 10.1128/JVI.00177-21 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (3.15 Å) |
Structure validation
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