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Content Provider | World Health Organization (WHO)-Global Index Medicus |
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Author | Li, B. Yamamoto, T. Copeland, T. Kamata, T. Kung, H. Subleski, M. Fusaki, N. Princler, G. L. |
Description | Author Affiliation: Li B ( Biological Carcinogenesis and Development Program, National Cancer Institute-Frederick Cancer Research and Development Center, MD 21702-1201, USA.); |
Abstract | mSOS, a guanine nucleotide exchange factor, is a positive regulator of Ras. Fyn tyrosine protein kinase is a potential mediator in T-cell antigen receptor signal transduction in subsets of T cells. We investigated the functional and physical interaction between mSOS and Fyn in T-cell hybridoma cells. Stimulation of the T-cell antigen receptor induced the activation of guanine nucleotide exchange activity in mSOS immunoprecipitates. Overexpression of Fyn mutants with an activated kinase mutation and with a Src homology 2 deletion mutation resulted in a stimulation and suppression of the mSOS activity, respectively. The complex formations of Fyn-Shc, Shc-Grb2, and Grb2-mSOS were detected in the activated Fyn-transformed cells, whereas the SH2 deletion mutant of Fyn failed to form a complex with mSOS. Moreover, tyrosine phosphorylation of Shc was induced by the overexpression of the activated Fyn. These findings support the idea that Fyn activates the activity of mSOS bound to Grb2 through tyrosine phosphorylation of Shc. Unlike the current prevailing model, Fyn-induced activation of Ras might involve the stimulation of the catalytic guanine nucleotide exchange activity of mSOS. |
ISSN | 00278424 |
e-ISSN | 10916490 |
Journal | Proceedings of the National Academy of Sciences of the United States of America |
Issue Number | 3 |
Volume Number | 93 |
Language | English |
Publisher | National Academy of Sciences |
Publisher Date | 1996-03-01 |
Publisher Place | United States |
Access Restriction | Open |
Subject Keyword | Adaptor Proteins, Signal Transducing Protein-Tyrosine Kinases Metabolism Proteins Proto-Oncogene Proteins Receptor-CD3 Complex, Antigen, T-Cell Receptors, Antigen, T-Cell T-Lymphocytes, Helper-Inducer Animals Enzyme Activation Eukaryotic Initiation Factor-2 GRB2 Adaptor Protein Gene Expression Guanine Nucleotide Exchange Factors Kinetics Mice Mutagenesis, Site-Directed Point Mutation Protein Binding Isolation & Purification Biosynthesis Proto-Oncogene Proteins C-fyn Immunology Recombinant Proteins Sequence Deletion Transfection Ras Guanine Nucleotide Exchange Factors Src Homology Domains Multidisciplinary |
Content Type | Text |
Resource Type | Article |
Subject | Multidisciplinary |
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