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Abstract
The Soybean mosaic virus (SMV) coat protein (CP) is necessary for virion assembly
and viral cell-to-cell and long-distance movements in plants. We previously showed
that the C-terminal region of the SMV CP is required for CP self-interaction. In the
present study, we generated SMV mutants containing CPs with single amino acid substitutions
of the charged amino acids in the C-proximal region. Infectivity and cell-to-cell
movement of the SMV mutants were examined in soybean plants. Through this genetic
approach, we identified three charged amino acid residues (R245, H246, and D250) in
the surface-exposed C-terminus of the SMV CP that are critical for virus cell-to-cell
and long-distance movement. Our findings suggest that the identified charged amino
acids in the surface-exposed C-terminus of SMV CP are critical for CP intersubunit
interactions and thereby for cell-to-cell and long-distance movement and virion assembly.