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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Friedrich, R. J. Hager, E. J. Cambier, J. C. Campbell, K. S. |
| Description | Author Affiliation: Campbell KS ( National Jewish Center for Immunology and Respiratory Medicine, Department of Pediatrics, Denver, CO 80206.); |
| Abstract | Membrane immunoglobulin M (mIgM) and mIgD are major B-lymphocyte antigen receptors, which function by internalizing antigens for processing and presentation to T cells and by transducing essential signals for proliferation and differentiation. Although ligation of mIgM or mIgD results in rapid activation of a phospholipase C and a tyrosine kinase(s), these receptors have cytoplasmic tails of only three amino acid residues (Lys-Val-Lys), which seem ill suited for direct physical coupling with cytoplasmic signal transduction structures. In this report, we identify the alpha, beta, and gamma components of the mIgM-associated phosphoprotein complex, which may play a role in signal transduction. Proteolytic peptide mapping demonstrated that the IgM-alpha chain differs from Ig-beta and Ig-gamma. The chains were purified, and amino-terminal sequencing revealed identity with two previously cloned B-cell-specific genes. One component, IgM-alpha, is a product of the mb-1 gene, and the two additional components, Ig-beta and Ig-gamma, are products of the B29 gene. Immunoblotting analysis using rabbit antibodies prepared against predicted peptide sequences of each gene product confirmed the identification of these mIgM-associated proteins. The deduced sequence indicates that these receptor subunits lack inherent protein kinase domains but include common tyrosine-containing sequence motifs, which are likely sites of induced tyrosine phosphorylation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 9 |
| Volume Number | 88 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1991-05-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antigens, CD B-Lymphocytes Cytology Membrane Glycoproteins Chemistry Phosphoproteins Receptors, Antigen, B-Cell Amino Acid Sequence Animals Antigens, CD79 Blotting, Western Macromolecular Substances Mice Molecular Sequence Data Peptide Mapping Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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