Heteromeric nature of glucocorticoid receptor

Abstract
The wild‐type and a mutant receptor of S49.1 lymphoma cells have been shown by photoaffinity labelling to contain steroid‐binding polypeptides of M r 94 000 and 40 000, respectively. We investigated the molybdate‐stabilized forms of these receptors and obtained M r 325 000 and 285 000, respectively, by gel filtration and sedimentation analysis. Mild chymotrypsin treatment of the large wild‐type receptor resulted in a form of about M r 290 000 which contained a steroid‐binding polypeptide of M r 40 000. The data suggest that the high‐M r forms of glucocorticoid receptors are heteromeric in nature and contain one steroid‐binding polypeptide per complex