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Science 2 October 1992:
Vol. 258. no. 5079, pp. 123 - 126
DOI: 10.1126/science.1439759
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Articles

Science, Vol 258, Issue 5079, 123-126
Copyright © 1992 by American Association for the Advancement of Science

articles

The B cell antigen receptor complex: association of Ig-alpha and Ig-beta with distinct cytoplasmic effectors

MR Clark, KS Campbell, A Kazlauskas, SA Johnson, M Hertz, TA Potter, C Pleiman, and JC Cambier

Division of Basic Sciences, National Jewish Center for Immunology and Respiratory Medicine, Denver, CO 80206.

The B cell antigen receptor complex is a hetero-oligomeric structure composed of antigen binding, membrane immunoglobulin, and transducer-transporter substructures. The transducer-transporter substructure is composed of disulfide-linked dimers of immunoglobulin (Ig)-alpha and Ig-beta/gamma subunits that are products of the mb-1(alpha) and B29 (beta/gamma) genes. Although the receptor complex associates with Src family kinases that are activated after receptor ligation, the site of interaction of these and other cytoplasmic effector molecules with receptor subunits is unknown. The cytoplasmic tails of Ig-alpha and Ig-beta chains were found to associate with distinct sets of effector molecules. The Ig-alpha chain cytoplasmic domain bound to the Src family kinases Lyn and Fyn, phosphatidylinositol-3 kinase (PI-3 kinase), and an unidentified 38-kilodalton phosphoprotein; the cytoplasmic tail of Ig-beta bound PI-3 kinase and unidentified 40- and 42-kilodalton phosphoproteins. Binding activity was found to occur within a 26-amino acid sequence of Ig-alpha and Ig-beta that contains a motif [(Asp or Glu)-(any amino acid)7-(Asp or Glu)-Tyr-(any amino acid)3-Leu-(any amino acid)7-Tyr-(any amino acid)2-(Leu or Ile)] previously implicated in signal transduction via other receptors including the Fc epsilon receptor I and the T cell antigen receptor. These findings indicate that the subunits act independently to activate distinct second messenger pathways.


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