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Reovirus type 3 and [125I]-iodocyanopindolol bind to distinct domains on the beta-adrenergic like receptor.
- Source :
-
Immunologic research [Immunol Res] 1988; Vol. 7 (3), pp. 232-8. - Publication Year :
- 1988
-
Abstract
- Antireceptor antibodies have been developed as a probe to study the cellular receptor for reovirus type 3. Using this probe, a glycoprotein with a molecular weight of 65-67 kilodaltons and a pI of 5.8-6.0 was isolated and identified as the reovirus receptor. This protein was also structurally similar to the affinity-purified beta-adrenergic receptor from calf lung. In this report, we employ [125I]-iodocyanopindolol, a high affinity beta-adrenergic antagonist, to further characterize this protein. We show that R1.1, a murine thymoma cell line, possesses about 2,000 receptors per cell with high affinity for ICYP (kD = 3.3 X 10(-11) M). Competitive inhibition studies suggest that the receptor is of the beta-2 subtype. Solubilized receptor proteins from R1.1 cells bound to the antireceptor antibody were further purified by SDS-PAGE and electroelution from the gel. Five percent of the proteins thus obtained could bind ICYP with high affinity (kD = 1.6 X 10(-10) M). This suggests that the purification procedure produced a collection of forms of this 65- to 67-kilodalton protein, some of which retained the conformation for binding the beta ligands. We also demonstrate that the isolated receptor protein was able to bind ICYP even when the virus binding site was occupied by the anti-idiotype, suggesting that reovirus type 3 and the beta ligands bind to distinct domains on the receptor protein.
- Subjects :
- Animals
Binding Sites, Antibody
Cell Line
Immunoglobulin Idiotypes immunology
Iodine Radioisotopes
Iodocyanopindolol
Mice
Pindolol metabolism
Receptors, Adrenergic, beta immunology
Receptors, Adrenergic, beta isolation & purification
Receptors, Virus immunology
Receptors, Virus isolation & purification
Thymoma metabolism
Adrenergic beta-Agonists metabolism
Mammalian orthoreovirus 3 metabolism
Pindolol analogs & derivatives
Receptors, Adrenergic, beta analysis
Receptors, Virus analysis
Reoviridae metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0257-277X
- Volume :
- 7
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Immunologic research
- Publication Type :
- Academic Journal
- Accession number :
- 2903881
- Full Text :
- https://doi.org/10.1007/BF02918138