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  • Title: Identification of two forms of progesterone receptor from chick oviduct cytosol using non-denaturing gel electrophoresis.
    Author: Smith DF, Skipper JK, Davidson FI, Hamilton TH.
    Journal: J Steroid Biochem; 1986 Apr; 24(4):787-93. PubMed ID: 3702455.
    Abstract:
    Non-denaturing polyacrylamide gel electrophoresis and non-denaturing agarose gel electrophoresis have been used to resolve [3H]R5020-binding components from chick oviduct cytosol. From both gel systems 2 peaks of bound radioactivity are resolved which display these properties of authentic progesterone receptor: binding of R5020: steroid specificity, saturability, and restriction to target tissues. The two peaks are approximately equal in magnitude, and there is no evidence for interconversion of the 2 peaks. The presence or absence of 10-20 mM sodium molybdate during cytosol preparation had no effect on the magnitude or mobility of either peak. Neither peak contains salt-dissociable components which affect its electrophoretic properties, suggesting a possible alteration of native receptor forms during electrophoresis.
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