Biochemical identity and characterization of the mouse interleukin-2 receptor beta and gamma c subunits.

Published

Journal Article

Although the mouse IL-2 receptor (IL-2R) beta and gamma c subunits have been identified by molecular cloning, the biochemical identity of these subunits has not yet been established. In the present study, the mouse IL-2R was biochemically characterized from cell lines expressing normal and aberrant IL-2R. Using novel monoclonal antibodies specific for the beta or gamma c subunits, we established that the M(r) of the beta chain is 90,000-100,000 and that of the gamma c subunit is 75,000-80,000. Analysis of transfected EL4 cells that expressed alpha, gamma c, and truncated beta subunits or mutant EL4 cells, which selectively lacked cell surface gamma c, revealed that no other material migrated to a position on SDS-PAGE characteristic of IL-2/IL-2R beta and IL-2/IL-2R gamma c cross-linked complexes, respectively. Thus, the beta and gamma c subunits appear to be the sole IL-2R constituents of these IL-2 cross-linked complexes. The IL-2/IL-2R gamma c, but not the IL-2/IL-2R beta, complex exhibited enhanced mobility after SDS-polyacrylamide gel electrophoresis under nonreducing conditions, suggesting a more compact structure for gamma c as a result of intrachain disulfide bonds. The primary posttranslational modification of the mouse beta and gamma c subunits is N-linked glycosylation. These biochemical studies reconcile past uncertainties concerning the subunit composition of the mouse IL-2R and are consistent with a model of the IL-2R containing only three subunits.

Full Text

Duke Authors

Cited Authors

  • Malek, TR; Furse, RK; Fleming, ML; Fadell, AJ; He, YW

Published Date

  • May 1995

Published In

Volume / Issue

  • 15 / 5

Start / End Page

  • 447 - 454

PubMed ID

  • 7648447

Pubmed Central ID

  • 7648447

International Standard Serial Number (ISSN)

  • 1079-9907

Digital Object Identifier (DOI)

  • 10.1089/jir.1995.15.447

Language

  • eng

Conference Location

  • United States