Assays

Nuclear extracts of cells expressing Trnp1, FLAGTrnp1, delta1-16Trnp1 or FLAGdelta1-16Trnp1 were obtained by re-suspended cells for 30 min on ice in Tween20 lysis buffer (25 mM HEPES pH 8, 20 mM NaCl, 2 mM EDTA, 1 mM PMSF, 0.5% Tween20, 1X protease inhibitors, cOmplete, Roche), pelleted nuclei by centrifugation, discarding the cytoplasmic fraction (supernatant) and lysing nuclei by sonication with lysis buffer containing 500 mM NaCl. DNAseI (250U; SIGMA) was added to the nuclear pellet and incubated ...