FIG. 4. Analysis of RV RNA interaction with human calreticulin expressed in E. coli. (A) SDS/PAGE analysis of Cal-MBP and MBP
expressed in E. coli, purified through a maltose binding column, and stained with silver nitrate. (B) Western blot analysis of fusion protein (lane
1) and cleaved calreticulin protein (lane 2) developed with calreticulin antiserum. (C) [y.32P]ATP-labeled Cal-MBP fusion protein and MBP (as
indicated) in the absence (lanes 1 and 2) and presence (lanes 3-5) of Vero 76 cytosol immunoprecipitated with MBP antibody. Note lack of
immunoprecipitation from cell extract alone in lane 5.