The third domain of cheEF1α interacted with vvIBDV VP3. (A) The expression plasmids harboring different domains of cheEF1α were depicted as cheEF1α-DI, cheEF1α-DII, cheEF1α-DIII, cheEF1α-DI+II, and cheEF1α-DII+III. (B) 293T cells were transfected expression plasmids with HA-vvIBDV VP3 and Flag-cheEF1α, HA-vvIBDV VP3 and Flag-cheEF1α-DI, HA-vvIBDV VP3 and Flag-cheEF1α-DII, HA-vvIBDV VP3 and Flag-cheEF1α-DIII, HA-vvIBDV VP3 and Flag-cheEF1α-DI+II, or HA-vvIBDV VP3 and Flag-cheEF1α-DII+III. Cell lysates were prepared at 36 h post transfection and immunoprecipitated with anti-Flag antibody and immunoblotted with anti-Flag or anti-HA antibodies. Each co-immunoprecipitation experiment was repeated three times.