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J. Biol. Chem., Vol. 262, Issue 18, 8483-8487, 06, 1987

The human interferon-gamma receptor. Purification, characterization, and preparation of antibodies

D Novick, P Orchansky, M Revel and M Rubinstein

The receptor for human interferon-gamma (IFN-gamma) was purified from foreskin fibroblasts. Triton X-100 extracts obtained from either intact cells or membrane preparations were passed through an immobilized interferon-gamma column. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) of eluted fractions revealed a major band of Mr = 95,000 and minor bands of Mr = 80,000 and 60,000. Further purification was obtained by steric exclusion and by lectin chromatography. The purified receptor retained the ability to bind 125I- IFN-gamma with a Kd of 2.2 X 10(-10) M, a value close to that obtained with intact fibroblasts (5 X 10(-10) M). A complex of Mr = 105,000- 125,000 was visualized by immunoprecipitation of 125I-IFN-gamma cross- linked to the purified receptor followed by SDS-PAGE and autoradiography. A similar complex was obtained when 125I-IFN-gamma was cross-linked to intact cells. Immunization of mice with the excised SDS- PAGE band of Mr = 95,000 elicited antibodies that blocked the antiviral activity of IFN-gamma and immunoprecipitated the cross-linked complex of 125I-IFN-gamma and its receptor.
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