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Three immunologically similar atrial natriuretic factor receptors

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Abstract

One of the atrial natriuretic factor (ANF) receptors is a 180 kDa protein (180 kDa mGC) which possesses the extraordinary characteristic of being bifunctional: it is both a receptor and a guanylate cyclase. In addition to the 180 kDa mGC, there exists another 120–130 kDa protein which is also bifunctional and a 120 kDa disulfide-linked dimeric cell surface protein that is an ANF receptor, but is not a part of guanylate cyclase. A fundamental question that needs to be resolved is: Are these three apparently biochemically distinct ANF receptors structurally similar? With the aid of affinity crosslinking techniques, a highly specific antibody to the 180 kDa mGC, and GTP-affinity techniques, we now demonstrate the presence of three immunologically similar proteins in rat adrenal gland and testes. These proteins migrate as 180 kDa, 130 kDa and 65 kDa under denaturing sodium dodecyl sulfate polyacrylamide gel electrophoresis and specifically bind ANF, raising one or more of the following possibilities about their relationships: 1) Degradation of 180 kDa to 130 kDa and 65 kDa occurs during purification; 2) 180 kDa bears a precursor-product relationship with 130 kDa and 65 kDa, suggesting the role of a protease in the processing procedure; 3) these proteins are a result of gene splicing; or 4) they are the products of three separate, but very closely related genes.

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  1. Section of Regulatory Biology, Research Institute, Cleveland Clinic Foundation, 9500 Euclid Avenue, 44195-5068, Cleveland, Ohio, USA

    Ravi B. Marala & Rameshwar K. Sharma

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  1. Ravi B. Marala
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  2. Rameshwar K. Sharma
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Marala, R.B., Sharma, R.K. Three immunologically similar atrial natriuretic factor receptors. Mol Cell Biochem 109, 71–75 (1992). https://doi.org/10.1007/BF00230875

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  • DOI: https://doi.org/10.1007/BF00230875

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