Physicochemical and Functional Properties of Chicken Breast Muscle Proteins

Abstract

Dexamethasone-receptor complexes can be extracted from HeLa cell nuclei by mild sonication. These complexes can account for 800–1000 binding sites/cell, and are indistinguishable from salt-extractable ones as judged by sucrose gradient centrifugation in the presence of 0.3 M KCl, showing a sedimentation coefficient of 3.6 S. These complexes, however, broadly sediment in the 7 to 3.6 S region of low salt sucrose gradients. Enzymatic treatment of soluble extracts from nuclear sonicates shows that RNA is associated to dexamethasone-receptor complexes.