Novel interleukin-2 receptor subunit detected by cross-linking under high-affinity conditions.

Published

Journal Article

Interleukin-2 (IL-2) binds to both high- and low-affinity classes of IL-2 receptors on activated T lymphocytes. Only the high-affinity receptors are involved in receptor-mediated endocytosis and normally transduce the mitogenic signals of IL-2; however, the structural features distinguishing the high- and low-affinity receptors are unknown. When 125I-labeled IL-2 was chemically cross-linked to activated human T lymphocytes, two major bands were identified. First, as predicted, a 68- to 72-kilodalton band, consisting of IL-2 (15.5 kilodaltons) cross-linked to the IL-2 receptor (55 kilodaltons), was observed. Second, an unpredicted 85- to 92-kilodalton moiety was detected. This band was not present when IL-2 was cross-linked to transfected C127 cells, which exclusively express low-affinity receptors. The data presented are most consistent with the existence of a 70- to 77-kilodalton glycoprotein subunit (p70) which, upon associating with the 55-kilodalton low-affinity receptor (p55), transforms it into a high-affinity site. It is proposed that p55 and p70 be referred to as the alpha and beta subunits, respectively, of the high-affinity IL-2 receptor.

Full Text

Duke Authors

Cited Authors

  • Sharon, M; Klausner, RD; Cullen, BR; Chizzonite, R; Leonard, WJ

Published Date

  • November 14, 1986

Published In

Volume / Issue

  • 234 / 4778

Start / End Page

  • 859 - 863

PubMed ID

  • 3095922

Pubmed Central ID

  • 3095922

International Standard Serial Number (ISSN)

  • 0036-8075

Digital Object Identifier (DOI)

  • 10.1126/science.3095922

Language

  • eng

Conference Location

  • United States