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J. Biol. Chem., Vol. 263, Issue 35, 18827-18833, Dec, 1988

Characterization of the atrial natriuretic peptide clearance receptor using a vaccinia virus expression vector

JG Porter, Y Wang, K Schwartz, A Arfsten, A Loffredo, K Spratt, DB Schenk, F Fuller, RM Scarborough and JA Lewicki
California Biotechnology, Incorporated, Mountain View 94043.

A recombinant vaccinia virus has been used to direct the expression of the atrial natriuretic peptide clearance receptor (ANP C-receptor) in mammalian cell lines normally deficient in this protein. The recombinant receptor binds 125I-ANP-(102-126) in a specific and saturable manner and carboxyl-terminal truncated and internal-deleted ANP analogs bind to this site with high affinity. Following the covalent attachment of 125I-ANP-(102-126) to the recombinant ANP C- receptor, the protein exhibits an electrophoretic mobility identical to that of the native ANP C-receptor of cultured vascular cells. Expression of the ANP C-receptor in heterologous cells does not affect ANP-stimulated cyclic GMP accumulation, confirming previous reports that this novel ANP receptor subpopulation is not coupled to cyclic GMP metabolism. Furthermore, specific antisera, generated by inoculating rabbits with living recombinant virus, block 125I-ANP binding to the ANP C-receptor but do not inhibit ANP stimulation of cyclic GMP, supporting the existence of two receptor subpopulations that are functionally and immunologically distinct.
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