Bclaf1 interacts with ISGF3 mainly through STAT2.

(A) GST pulldown analysis of the interaction between His-STAT1/STAT2/IRF9 and GST-Bclaf1 F2. (B) IB analysis of immunoprecipitates of HEK293T cells co-transfected with Flag-tagged Bclaf1, Ha-tagged STAT1 or STAT2/IRF9 expression plasmids. (C) IB analysis of immunoprecipitates of HEK293T cells co-transfected with Flag-tagged Bclaf1, Ha-tagged IRF9 or STAT2/STAT1 expression plasmids. (D) IB analysis of STAT1, STAT2, IRF9 and Flag-Bclaf1 in nuclear immunoprecipitates of a HEp-2-Flag-Bclaf1 cell line transfected with si-control or si-STAT2 followed by PBS or human IFNα (500U/mL) treatment for 3h. (E) IB analysis of Bio-ISRE pull-down STAT1, STAT2, IRF9 and Bclaf1.