Characterization of the human type I interferon receptor by ligand blotting.

Abstract:

:The human type I interferon (IFN) receptor was characterized by ligand blotting. In this method, plasmalemma proteins or detergent-lysed whole-cell extracts from human Burkitt lymphoma cell lines were separated on polyacrylamide gels and subsequently transferred onto nitrocellulose sheets. Probing the blots with 3 x 10(-10) M 125I-labeled recombinant IFN-alpha A (125I-rIFN-alpha A) revealed an IFN-alpha-binding protein with an apparent molecular mass of 95 kDa (p95). Performing the electrophoretic run under reducing conditions completely abrogated the signal on the blot, indicating that the type I IFN receptor contains a disulfide bond essential for IFN binding. Optimal binding of 125I-rIFN-alpha A occurred at pH 9. The specificity of the binding reaction was established by simultaneously adding an excess of unlabeled IFN during incubation of the blots with 125I-rIFN-alpha A. The addition of either unlabeled IFN-alpha or IFN-beta, but not IFN-gamma, abolished the binding of 125I-rIFN-alpha A to p95. 125I-IFN-gamma at 1.25 x 10(-11) M bound to two proteins distinct from p95 with apparent molecular mass of 92 and 87 kDa, respectively. Saturability of 125I-rIFN-alpha A binding was demonstrated by probing a constant amount of membrane proteins with increasing amounts of 125I-rIFN-alpha A. Scatchard analysis of the binding data yielded an apparent Kd of 5.4 x 10(-10) M for the immobilized type I IFN receptor. The expression of p95 on IFN-alpha-resistant and -sensitive cells was indistinguishable. We conclude that p95 is the IFN-alpha/beta receptor and that two proteins (p92 and p87) can specifically bind IFN-gamma. These results indicate that ligand blotting is a versatile method for characterization of unmodified IFN receptors and IFN-receptor interaction and could also provide a new investigational approach for other cytokine receptor systems.

journal_name

Eur J Immunol

authors

Schwabe M,Princler GL,Faltynek CR

doi

10.1002/eji.1830181221

subject

Has Abstract

pub_date

1988-12-01 00:00:00

pages

2009-14

issue

12

eissn

0014-2980

issn

1521-4141

journal_volume

18

pub_type

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