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The antigenic inconsistency of the foot-and-mouth disease virus (FMDV) is very broad, such that a vaccine made from one isolate will not offer protection against infection with other isolates from the same serotype. Viral particles (VPs) or surface exposed capsid proteins, VP1–VP3, of FMDV determine both the antigenicity of the virus and its receptor-mediated entry into the host cell. Therefore, modifications of these structural proteins may alter the properties of the virus. Here we show putative cavities on the FMDV-SAT1 (FMDV Southern African Territories1) capsid as possible binding sites for the receptor-mediated viral entry into the host cell. We identified three possible cavities on the FMDV capsid surface, from which the largest one (C2) is shaped in the contact regions of VP1–VP3. Our results demonstrate the significance of VP1, in the formation of FMDV-SAT1 surface cavities, which is the main component in all the identified cavities. Our findings can have profound implications in the protein engineering of FMDV in the contact region of VP1–VP3 found to be embedded in several cavities. Such information is of great significance in the context of vaccine design, as it provides the ground for future improvement of synthetic vaccines to control FMD caused by FMDV-SAT1 serotypes.

The Critical Role Of VP1 In Forming The Necessary Cavities For Receptor-mediated Entry Of FMDV To The Host Cell