Bifunctional atrial natriuretic peptide receptor (type a) exists as a disulfide-linked tetramer in plasma membranes of bovine adrenal cortex

Tomoko Iwata, Keiko Uchida-mizuno, Takeshi Katafuchi, Teizo Ito, Hiromi Hagiwara, Shigehisa Hirose

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

Type A atrial natriuretic peptide (ANP) receptor was demonstrated to be present as a tetramer in the bovine adrenal cortex. Type A ANP receptor is composed of two functional domains, namely extracellular ANP-binding and cytoplasmic guanylate cyclase domains, and generally considered to be present as a single polypeptide chain of about 140 kDa based on its primary structure deduced from the cDNA sequence and its SDS/PAGE profile under reducing conditions. Characterization of the type A receptor or receptor/cyclase under non-reducing conditions led to the discovery stated in the title. The type A ANP receptor was partially purified from bovine adrenal cortex membranes by Blue-Sepharose and GTP-agarose chromatography. SDS-PAGE analysis of the receptor preparation revealed that although under reducing conditions it migrated as a 140-kDa band, the mobility of the receptor was greatly retarded in the absence of reducing agents, suggesting that the type A ANP receptor is present as a disulfide-linked oligomer in its native state. Further analysis using SDS-polyacrylamide-agarose gels suitable for determining the sizes of high-molecular-weight proteins revealed that the oligomer has an Mr of 500,000-550,000. This result clearly indicates that the native form of the type A receptor is a tetramer composed of four 140-kDa disulfide-linked receptor/cyclase molecules.

Original languageEnglish (US)
Pages (from-to)35-39
Number of pages5
JournalJournal of Biochemistry
Volume110
Issue number1
DOIs
StatePublished - Jul 1991

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology

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