... and the supernatant recoveredto give a final protein concentration of 2mgÆmL)1. Pro-tein concentration was measured by Bradford Assay (Bio-Rad), and radioactivity per lg protein was measured ... absence of Hsp90 function. As a conse-quence of ansamycin pretreatment, the rate of Hspsynthesis is maintained for a longer duration and excess amounts of each of the major classes of Hspsaccumulate. ... pelletwas disrupted by pipeting. 1 ⁄ 20 volume of RNase ⁄ DNasesolution (5 mgÆmL)1DNase, 2.5 mgÆmL)1RNase A,500 mm Tris pH 7.0, 50 mm MgCl2) was added for 1 min,viscosity reduced by pipeting,...