Figure 2.
p97 binding to cofactors and membrane requires its N domain. (A) p97 binding to cofactors. Purified His-tagged p97 proteins (His-p97) were added to rat liver cytosol in the presence of 1 M NaCl. After dilution of the salt to 150 mM, p97 was immunoprecipitated with His antibodies. Bound proteins were detected by immunoblotting with antibodies to the indicated proteins. (B) Association of p97 with the membrane. Purified His-p97 proteins were added to permeabilized astrocytoma cells. After incubation, the cells were fractionated into membrane (P) and cytosol (S) fractions. The amount of His-p97 in each fraction was determined by immunoblotting with His antibodies (top). Immunoblotting for calnexin served as a loading control for the membrane fraction (bottom).