Correlation of the 4-5 S form and the 8 S form of the cytosolic androgen receptor in murine skeletal muscle.
Binding experiments with the cytosolic androgen receptor from murine skeletal muscle yield with testosterone a biphasic saturation curve and a biphasic Scatchard plot. These binding characteristics result from the conversion of 8 S receptor (KD = 1,4 X 10(-10) M) into 4-5 S receptor (KD = 1,2 X 10(-9) M). This conversion is androgen dependent and is facilitated in vitro by either UV-irradiation or by methods known to activate steroid hormone receptor complexes to a nuclear binding form (e.g. high ionic strength or elevated temperature). The measured data show that both receptor forms are in a complex dissociation equilibrium. The reassociation of the 4-5 S receptor to form the 8 S complex is inhibited by RNase.
D000818:Animals; D003600:Cytosol / Q000378:metabolism; D003907:Dexamethasone / Q000494:pharmacology; D007700:Kinetics; D051379:Mice; D008970:Molecular Weight; D009132:Muscles / Q000378:metabolism*; D011944:Receptors, Androgen / Q000187:drug effects / Q000302:isolation & purification / Q000378:metabolism*; D011987:Receptors, Steroid / Q000378:metabolism*; D013739:Testosterone / Q000378:metabolism
D011944:Receptors, Androgen; D011987:Receptors, Steroid; D013739:Testosterone; D003907:Dexamethasone