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. 1987 Mar 15;242(3):713–720. doi: 10.1042/bj2420713

Structural studies on membrane-bound and soluble growth-hormone-binding proteins of rabbit liver.

S I Ymer, A C Herington
PMCID: PMC1147769  PMID: 3593272

Abstract

Covalent cross-linking techniques have been used to investigate the structural characteristics of the growth-hormone (GH) receptor in a variety of rabbit liver cell membrane preparations (particulate and soluble). Two classes of GH-binding protein have been identified which differ in their Mr by gel filtration and susceptibility to precipitation with poly(ethylene glycol) (PEG). The first, a PEG-precipitable (Mr approximately 300,000) protein, contained Mr-65,000 and Mr-40,000 binding proteins linked by disulphide bonds. It was present in aqueous extracts derived from microsomal membranes but was not present in cytosol preparations. The second, a PEG-non-precipitable protein (Mr approximately 100,000) was composed of a non-disulphide-linked primary GH-binding subunit of Mr 60,000-66,000. This binding protein was present in all rabbit liver cell fractions and/or preparations. Both binding-protein classes contained intramolecular disulphide bonds. It is not clear whether the Mr-approximately 100,000 form, or perhaps higher-Mr species which have not been identified by cross-linking studies, represents the native, endogenous, form of the GH receptor present in particulate microsomal or plasma membranes. Accordingly, although these data have identified two classes of GH-binding protein, especially a primary GH-binding subunit of Mr 60,000-66,000, they indicate that, unlike studies on the insulin receptor, covalent cross-linking techniques alone are not sufficient to delineate the complete subunit structure of the native and endogenous form of the GH receptor.

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