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Orthomyxoviruses are a family of ssRNA virus, including influenza virus, infectious salmon anaemia virus and Thogoto virus. The matrix proteins of orthomyxoviruses play crucial roles in some essential processes of the viral life cycle. However, the mechanisms of the matrix proteins involved in these processes remain incompletely understood. Currently, only the structure and function of the matrix protein from influenza virus have been studied. Here, we present the crystal structures of the N-terminal domain of matrix protein from Thogoto virus at pH 7.0 and 4.5. By analysing the structures, we identified the conformational changes of monomers and dimers in different pH conditions, mainly caused by two flexible loops, L3 and L5. These structural deviations would reflect the basis of viral capsid assembly or disassembly.

pH-dependent conformational changes of a Thogoto virus matrix protein reveal mechanisms of viral assembly and uncoating