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Effects of beta subunit acylation on lutropin receptor site binding.

The effects of various modifications on the beta subunit of lutropin have been studied using the binding characteristics of the reconstituted hormone in the rat testicular radioligand assay. Conditions for iodinating lutropin and lutropin derivatives were determined which resulted in 15 per cent specific binding when tested immediately and retention of 6 to 7 per cent specific binding even after storage for 6 months. Acetimidinyl, acetyl, and carbamyl derivatives of the beta subunit were prepared and combined with unmodified alpha subunit to form reconstituted lutropin. Modification of the beta subunit was shown to have no effect on the time course of binding to testicular receptors or, with one exception, on the extent of receptor saturation. Very high concentrations of lutropin reconstituted with acetylated beta subunit showed an anomalous binding behavior. Scatchard plots of the binding data support the view that the native hormone has a unique receptor affinity which is irreversibly disrupted by separation of subunits and that derivatization of the beta subunit does not alter this parameter further. These data also suggest that there are no significant differences in the amino groups modified on the beta subunit. Competition and preincubation tests for receptor sites that reacted only with modified lutropin and not with the native hormone were negative.