151
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Defective protein phosphorylation and Ca2+ mobilization in a low secreting variant of the rat basophilic leukemia cell line. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32167-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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152
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Swaim W, Minoguchi K, Oliver C, Hamawy M, Kihara H, Stephan V, Berenstein E, Siraganian R. The anti-ganglioside monoclonal antibody AA4 induces protein tyrosine phosphorylations, but not degranulation, in rat basophilic leukemia cells. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32192-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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153
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Hampe CS, Pecht I. Protein tyrosine phosphatase activity enhancement is induced upon Fc epsilon receptor activation of mast cells. FEBS Lett 1994; 346:194-8. [PMID: 8013632 DOI: 10.1016/0014-5793(94)00471-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Immunological stimulation of rat mucosal type mast cells (line RBL-2H3) by clustering the type I Fc epsilon receptor (Fc epsilon RI) causes a fast and transient tyrosine phosphorylation of several proteins. This implied the involvement of both, protein tyrosine kinases (PTKs) and protein tyrosine phosphatases (PTPases) in that process. In order to identify the PTPases involved in these very early steps coupling Fc epsilon RI stimulus to cell response, we undertook the purification and characterization of PTPases present in RBL-2H3 cells. In one of the cells' membranal fractions, a PTPase activity was found to be enhanced 2- to 3-fold upon cell stimulation by Fc epsilon RI clustering. Characterization of this activity implies its involvement in control of the Fc epsilon RI signalling cascade.
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Affiliation(s)
- C S Hampe
- Department of Chemical Immunology, Weizmann Institute of Science, Rehovot, Israel
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154
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Couture C, Baier G, Altman A, Mustelin T. p56lck-independent activation and tyrosine phosphorylation of p72syk by T-cell antigen receptor/CD3 stimulation. Proc Natl Acad Sci U S A 1994; 91:5301-5. [PMID: 7515496 PMCID: PMC43982 DOI: 10.1073/pnas.91.12.5301] [Citation(s) in RCA: 96] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Activation of resting T lymphocytes by ligands to the T-cell antigen receptor (TCR)/CD3 complex is initiated by rapid tyrosine phosphorylation of cellular proteins. Protein-tyrosine kinases (PTKs) of the src family are known to be important, but the mechanism of their recruitment and their interactions with PTKs of other families are incompletely understood. We show that a member of another family of PTKs, the p72syk kinase, is constitutively bound to the TCR/CD3 complex and becomes tyrosine phosphorylated and activated within 1 min after TCR/CD3 stimulation. This activation did not depend on the presence of p56lck in T cells and in transfected COS cells. In both cases, however, the phosphorylation of cellular substrates was augmented by src family PTKs. We propose that p72syk may act as an immediate receptor-activated kinase upstream of the related p70zap PTK and the src family PTKs p56lck and p59fyn in T cells and that these src family PTKs act as signal amplifiers.
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Affiliation(s)
- C Couture
- Division of Cell Biology, La Jolla Institute for Allergy and Immunology, CA 92037
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155
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Minoguchi K, Benhamou M, Swaim W, Kawakami Y, Kawakami T, Siraganian R. Activation of protein tyrosine kinase p72syk by Fc epsilon RI aggregation in rat basophilic leukemia cells. p72syk is a minor component but the major protein tyrosine kinase of pp72. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(19)89475-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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156
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Yang C, Yanagi S, Wang X, Sakai K, Taniguchi T, Yamamura H. Purification and characterization of a protein-tyrosine kinase p72syk from porcine spleen. EUROPEAN JOURNAL OF BIOCHEMISTRY 1994; 221:973-8. [PMID: 8181480 DOI: 10.1111/j.1432-1033.1994.tb18813.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We have succeeded in purifying p72syk, a non-receptor-type protein-tyrosine kinase carrying high susceptibility to proteolysis [Taniguchi, T., Kobayashi, T., Kondo, J., Takahashi, K., Nakamura, H., Suzuki, J., Nagai, K., Yamada, T., Nakamura, S. and Yamamura, H. (1991) J. Biol. Chem. 266, 15790-15796] from porcine spleen. The purification procedure involves a sequential column chromatography, following extraction with 0.5 M NaCl from spleen homogenate, on phosphocellulose, Sephacryl S-200, heparin-Sepharose CL-6B, Mono Q and Mono S. SDS/PAGE of the final purified sample revealed a 72-kDa protein band with about 95% purity and immunodepletion analysis showed immunological cross-reactivity with anti-p72syk antibody which does not recognize ZAP-70. It was purified approximately 3000-fold with an overall yield of 0.54% according to [Val5]angiotensin II phosphorylation activity and the specific activity of the final sample (30 nmol phosphate.min-1.mg protein-1) was relatively lower than that of the 40-kDa kinase, a catalytic fragment of p72syk which lacks two src homology regions 2 domains. The p72syk had an autophosphorylation activity that was performed by intramolecular catalysis accompanied by a phosphate exchange reaction, and could efficiently phosphorylate tubulin, myelin basic protein and H2B histone. Employing [Val5]angiotensin II as a substrate, the apparent Km value for the peptide was 0.91 mM and that for ATP was 0.48 microM. Mn2+, Mg2+ and Co2+ were effective divalent cations and optimum pH was around 8.0-8.5 for the expression of the activity. These results suggest that the purified p72syk may exist as a less active form compared with the 40-kDa kinase and that the part of p72syk containing two src homology region 2 domains may participate in the regulation of its activity though the enzymic character is quite similar to that of the 40-kDa kinase.
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Affiliation(s)
- C Yang
- Department of Biochemistry, Fukui Medical School, Matsuoka, Japan
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157
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Clustering of the high affinity Fc receptor for immunoglobulin G (Fc gamma RI) results in phosphorylation of its associated gamma-chain. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32688-1] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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158
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Molecular cloning of human Syk. A B cell protein-tyrosine kinase associated with the surface immunoglobulin M-B cell receptor complex. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32717-5] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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159
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Müller B, Cooper L, Terhorst C. Molecular cloning of the human homologue to the pig protein-tyrosine kinase syk. Immunogenetics 1994; 39:359-62. [PMID: 8168854 DOI: 10.1007/bf00189234] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- B Müller
- Division of Immunology, Beth Israel Hospital, Harvard Medical School, Boston, MA 02115
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160
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Ghazizadeh S, Bolen J, Fleit H. Physical and functional association of Src-related protein tyrosine kinases with Fc gamma RII in monocytic THP-1 cells. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)37050-3] [Citation(s) in RCA: 139] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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161
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Iwashima M, Irving BA, van Oers NS, Chan AC, Weiss A. Sequential interactions of the TCR with two distinct cytoplasmic tyrosine kinases. Science 1994; 263:1136-9. [PMID: 7509083 DOI: 10.1126/science.7509083] [Citation(s) in RCA: 566] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The T cell antigen receptor (TCR) initiates signals by interacting with cytoplasmic protein tyrosine kinases (PTKs) through a 17-residue sequence motif [called the antigen recognition activation motif (ARAM)] that is contained in the TCR zeta and CD3 chains. TCR stimulation induces the tyrosine phosphorylation of several cellular substrates, including the ARAMs. Lck kinase activity is required for phosphorylation of two conserved tyrosine residues in an ARAM. This phosphorylation leads to the recruitment of a second cytoplasmic PTK, ZAP-70, through both of the ZAP-70 Src homology 2 domains and its phosphorylation. Thus, TCR signal transduction is initiated by the sequential interaction of two PTKs with TCR ARAMs.
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Affiliation(s)
- M Iwashima
- Howard Hughes Medical Institute, University of California, San Francisco 94143
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162
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Src family tyrosine kinase p53/56lyn, a serine kinase and Fc epsilon RI associate with alpha-galactosyl derivatives of ganglioside GD1b in rat basophilic leukemia RBL-2H3 cells. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)37681-0] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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163
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Differential control of the tyrosine kinases Lyn and Syk by the two signaling chains of the high affinity immunoglobulin E receptor. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)37549-x] [Citation(s) in RCA: 261] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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164
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Maekawa K, Imagawa N, Nagamatsu M, Harada S. Molecular cloning of a novel protein-tyrosine phosphatase containing a membrane-binding domain and GLGF repeats. FEBS Lett 1994; 337:200-6. [PMID: 8287977 DOI: 10.1016/0014-5793(94)80273-4] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A full-length cDNA encoding a novel cytosolic protein-tyrosine phosphatase (PTP), PTP-BAS, was cloned from human basophils. Due to in-frame deletions in the coding region, PTP-BAS exists in three isoforms: 7,455 bp (2,485 aa) for type 1, 7,398 bp (2,466 aa) for type 2 and 6,882 bp (2,294 aa) for type 3. All three isoforms contain a single PTP catalytic domain at the carboxyl termini as well as two distinct structural sequences. Amino terminal sequences of 300 amino acids are homologous to membrane-binding domains of cytoskeleton-associated proteins. Three 90 amino acid internal repetitive sequences are homologous to the GLGF repeats found in guanylate kinase proteins. PTP-BAS was expressed in various human tissues, especially highly in the kidney and lung. Interestingly, the BAS mRNA level in the fetal brain was remarkably high.
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Affiliation(s)
- K Maekawa
- Shionogi Institute for Medical Science, Osaka, Japan
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165
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Seed B, Kolanus W, Romeo C, Xavier R. Nonreceptor tyrosine kinases in aggregation-mediated cell activation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1994; 365:111-9. [PMID: 7887297 DOI: 10.1007/978-1-4899-0987-9_12] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- B Seed
- Department of Molecular Biology, Massachusetts General Hospital, Boston 02114
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166
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Geahlen RL, Burg DL. The role of Syk in cell signaling. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1994; 365:103-9. [PMID: 7887296 DOI: 10.1007/978-1-4899-0987-9_11] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- R L Geahlen
- Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907
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167
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Affiliation(s)
- M D Hulett
- Austin Research Institute, Heidelberg, Australia
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168
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Harrison M, Isaacson C, Burg D, Geahlen R, Low P. Phosphorylation of human erythrocyte band 3 by endogenous p72syk. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)42204-6] [Citation(s) in RCA: 103] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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169
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CELLULAR ACTIVATION. Cell Immunol 1994. [DOI: 10.1016/b978-0-12-208885-8.50018-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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170
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Abstract
Receptors for the Fc domain of IgG (Fc gamma Rs) on leukocytes mediate a pleiotropic response following cross-linking by immune complexes. Signaling events following cross-linking of B and T cell antigen receptors, Fc epsilon RI, and Fc gamma Rs share common elements. In each, signaling is initiated by receptor cross-linking by antigen or immune complexes and results in the activation of src family kinases and ZAP-70-related tyrosine kinases, which associate with members of the receptor complex. Subsequent events include phosphorylation on tyrosine of multiple cellular substrates including phospholipase C gamma 1 and PI3-kinase. The [Ca2+]i flux is an event secondary to phospholipase C gamma 1 activation. Protein tyrosine kinase inhibitors block both early events such as [Ca2+]i flux and the later effects of cytokine release and cellular proliferation.
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Affiliation(s)
- C T Lin
- Department of Biochemistry, Mount Sinai School of Medicine, New York, New York 10029-6574
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171
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Clark EA, Berberich I, Klaus SJ, Law CL, Sidorenko SP. Accessory molecules that influence signaling through B lymphocyte antigen receptors. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1994; 365:35-43. [PMID: 7887311 DOI: 10.1007/978-1-4899-0987-9_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- E A Clark
- Department of Microbiology, University of Washington Medical Center SC-42, Seattle 98195
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172
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Benhamou M, Ryba N, Kihara H, Nishikata H, Siraganian R. Protein-tyrosine kinase p72syk in high affinity IgE receptor signaling. Identification as a component of pp72 and association with the receptor gamma chain after receptor aggregation. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(19)49465-9] [Citation(s) in RCA: 176] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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173
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Cross-linking of Fc gamma receptor I (Fc gamma RI) and receptor II (Fc gamma RII) on monocytic cells activates a signal transduction pathway common to both Fc receptors that involves the stimulation of p72 Syk protein tyrosine kinase. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(20)80545-6] [Citation(s) in RCA: 128] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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174
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Tyrosine phosphorylation of a mitogen-activated protein kinase-like protein occurs at a late step in exocytosis. Studies with tyrosine phosphatase inhibitors and various secretagogues in rat RBL-2H3 cells. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)41586-4] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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175
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Tsygankov A, Bolen J. The Src family of tyrosine protein kinases in hemopoietic signal transduction. Stem Cells 1993; 11:371-80. [PMID: 7694720 DOI: 10.1002/stem.5530110504] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The Src family of tyrosine protein kinases (TPKs) represents a class of closely related intracellular enzymes that participate in the signal transduction pathways in a variety of hemopoietic cells. The Src TPKs associate with multiple cell surface molecules rendering these receptors capable of activating tyrosine phosphorylation of cellular protein targets. Despite phenotypic differences between various hemopoietic cells, the signal transduction pathways that involve Src TPKs demonstrate clear similarities. Accumulating data on the antigen-induced activation in T cells, B cells, and mast cells indicate that the Src TPKs participate in early antigen receptor responses in these cells.
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Affiliation(s)
- A Tsygankov
- Department of Molecular Biology, Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, NJ 08543-4000
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176
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Vivier E, da Silva AJ, Ackerly M, Levine H, Rudd CE, Anderson P. Association of a 70-kDa tyrosine phosphoprotein with the CD16: zeta: gamma complex expressed in human natural killer cells. Eur J Immunol 1993; 23:1872-6. [PMID: 8344348 DOI: 10.1002/eji.1830230821] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The CD16: zeta: gamma receptor complex allows natural killer (NK) cells to recognize and eliminate antibody-coated target cells. Whereas the ectodomain of CD16 is the receptor for Fc gamma domains of immunoglobulins, disulfide-linked homo- and heterodimers composed of zeta and gamma are required for the cell surface expression, and signal transduction properties of the complex. Engagement of CD16 activates the tyrosine kinase pathway, which induces the tyrosine phosphorylation of several substrates, including the zeta subunit and the phospholipase C gamma-1 and gamma-2 isoforms. Here we show that CD16 stimulation of either peripheral blood NK cells, leukemic NK cells, or Jurkat transformants expressing a CD16: zeta: gamma receptor complex, results in the tyrosine phosphorylation of a 70 kDa zeta-associated protein (pp70). Similarly, a 70-kDa zeta-associated phosphoprotein in T cells has been shown to be a tyrosine kinase (ZAP-70). Peptide mapping analysis indicates that the 70-kDa zeta-associated phosphoproteins from T cells and NK cells are structurally indistinguishable. We conclude that the CD16: zeta: gamma complex may use a ZAP-70-related non-receptor tyrosine kinase, in the CD16 signaling cascade leading to NK cell activation.
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Affiliation(s)
- E Vivier
- Department of Pathology, Harvard Medical School, Boston, MA
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177
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Shakarjian M, Eiseman E, Penhallow R, Bolen J. 3-Hydroxy-3-methylglutaryl-coenzyme A reductase inhibition in a rat mast cell line. Impairment of tyrosine kinase-dependent signal transduction and the subsequent degranulation response. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)82463-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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178
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Salcedo TW, Kurosaki T, Kanakaraj P, Ravetch JV, Perussia B. Physical and functional association of p56lck with Fc gamma RIIIA (CD16) in natural killer cells. J Exp Med 1993; 177:1475-80. [PMID: 8478617 PMCID: PMC2191009 DOI: 10.1084/jem.177.5.1475] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The transmembrane receptor for immunoglobulin G immune complexes on natural killer (NK) cells and macrophages, Fc gamma RIIIA (CD16), mediates cellular activation through a tyrosine kinase-dependent pathway. We show that Fc gamma RIII crosslinking results in activation of the src-related kinase p56lck in NK cells and demonstrate a physical association of p56lck with Fc gamma RIIIA in immunoprecipitates from NK cells obtained using anti-Fc gamma RIII antibodies or immune complexes. Our studies show that the zeta chain, the signal transducing subunit of Fc gamma RIIIA and of T cell receptor, associates with p56lck and, in NK cells, is a substrate for this kinase. Such direct association of p56lck with the zeta subunit as confirmed by demonstrating the interaction in heterologous cells transfected with cDNA expressing p56lck and zeta. Our findings demonstrate both functional and physical association of p56lck with Fc gamma RIIIA, through direct interaction of the kinase with the zeta and/or the gamma signal transducer subunits of the receptor. These data suggest a possible mechanism by which activation via Fc gamma RIIIA occurs.
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Affiliation(s)
- T W Salcedo
- Department of Microbiology and Immunology, Jefferson Cancer Institute, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
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179
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Irving BA, Chan AC, Weiss A. Functional characterization of a signal transducing motif present in the T cell antigen receptor zeta chain. J Exp Med 1993; 177:1093-103. [PMID: 8459204 PMCID: PMC2190991 DOI: 10.1084/jem.177.4.1093] [Citation(s) in RCA: 256] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
A conserved sequence motif has been identified in a number of signaling subunits associated with hematopoietic cell antigen receptors. Here, we characterize signaling by a 17 amino acid motif that is triplicated in the T cell antigen receptor zeta chain. Analysis of zeta truncations and constructs containing the isolated motif demonstrates that this motif is sufficient for the induction of both proximal and distal events associated with T cell activation. Stimulation of truncations that contain either one, two, or three copies of the motif results in induction of an identical pattern of tyrosine phosphoproteins. Moreover, triplication of the NH2-terminal zeta motif results in enhanced signaling, suggesting a redundant role in signal amplification for the three motifs in zeta. Finally, we demonstrate the association of a recently identified protein tyrosine kinase ZAP-70 with this motif, and provide evidence for its involvement in zeta function.
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Affiliation(s)
- B A Irving
- Department of Physiology, University of California, San Francisco 94143
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180
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Tyrosine phosphorylation of pp125FAK by the aggregation of high affinity immunoglobulin E receptors requires cell adherence. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)53114-8] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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181
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Burg D, Harrison M, Geahlen R. Cell cycle-specific activation of the PTK72 protein-tyrosine kinase in B lymphocytes. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)53774-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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182
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Paolini R, Numerof R, Kinet JP. Phosphorylation/dephosphorylation of high-affinity IgE receptors: a mechanism for coupling/uncoupling a large signaling complex. Proc Natl Acad Sci U S A 1992; 89:10733-7. [PMID: 1438270 PMCID: PMC50416 DOI: 10.1073/pnas.89.22.10733] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Engagement of high-affinity IgE receptors leads to activation of tyrosine and serine/threonine kinases and the immediate phosphorylation of receptor beta (serine and tyrosine) and gamma (threonine and tyrosine) chains. Receptor disengagement leads to dephosphorylation of beta and gamma chains via the action of undefined phosphatases. Here we have identified five distinct polypeptides associated with the high-affinity IgE-receptor tetrameric complex, which apparently become phosphorylated and dephosphorylated in sequence with the beta and gamma chains. Like beta chain, polypeptides pp180, pp48, pp42, and pp28 are phosphorylated on serine and tyrosine, whereas pp125 is only phosphorylated on serine. The phosphorylation of each of these receptor-associated polypeptides is antigen-dose dependent and is restricted to activated receptor complexes. Furthermore the physical association between pp125 and the receptor is quantitatively affected by receptor phosphorylation and dephosphorylation, indicating a coupling-uncoupling mechanism. Finally, in vitro kinase experiments show that activated receptor complexes are also physically associated with tyrosine and serine/threonine kinases as part of a larger complex containing the phosphorylated polypeptides.
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Affiliation(s)
- R Paolini
- National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852
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183
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Fukamachi H, Kawakami Y, Takei M, Ishizaka T, Ishizaka K, Kawakami T. Association of protein-tyrosine kinase with phospholipase C-gamma 1 in bone marrow-derived mouse mast cells. Proc Natl Acad Sci U S A 1992; 89:9524-8. [PMID: 1384056 PMCID: PMC50164 DOI: 10.1073/pnas.89.20.9524] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Bone marrow-derived mouse mast cells contain phospholipase C-gamma 1 (PLC-gamma 1), which is phosphorylated at tyrosine residues upon cross-linking of cell-bound IgE antibodies with multivalent antigen. It was found that immune complexes formed from digitonin lysates of the mast cells by monoclonal anti-PLC-gamma 1 antibodies contained protein-tyrosine kinase (PTK), which phosphorylated PLC-gamma 1 in vitro. The tyrosine kinase activity coprecipitated with PLC-gamma 1-anti-PLC-gamma 1 complexes markedly increased when the cell lysates were obtained immediately after antigen challenge. The results indicate that PTK is associated with PLC-gamma 1 in the mast cells and that the kinase is activated upon cross-linking of Fc epsilon RI. Neither beta nor gamma subunit of Fc epsilon RI nor src family PTK was coprecipitated with the PLC-gamma 1-anti-PLC-gamma 1 complexes. In situ denaturation/renaturation experiments, which detect autophosphorylated kinases, indicated that the PTK associated with PLC-gamma 1 was a 44-kDa protein.
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Affiliation(s)
- H Fukamachi
- Division of Immunobiology, La Jolla Institute for Allergy and Immunology, CA 92037
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