期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1993
卷号：90
期号：6
页码：2428-2432
DOI：10.1073/pnas.90.6.2428
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The interleukin 2 receptor (IL-2R) consists of at least two subunits, alpha and beta, both of which can bind interleukin 2 (IL-2). Recent studies have demonstrated the existence of a third subunit, a 64-kDa molecule termed IL-2R gamma chain, and have suggested that gamma chain functions to regulate the rate of IL-2 dissociation from the receptor. In the present report we have addressed whether the gamma chain modulates IL-2R affinity by contributing contact sites for IL-2 binding. Using reagents that allow the IL-2R complex to be immunoprecipitated through the IL-2 molecule itself, we demonstrate the existence of a stable IL-2-IL-2R gamma-chain complex. These studies thus establish that the IL-2R gamma chain directly contributes to the IL-2-binding site, consistent with the hypothesis that gamma chain influences IL-2R affinity through its direct interaction with IL-2.
