Cited by 138Protein Kinase Regulation and GTPase SignalingT-cell and B-cell ImmunologyImmunodeficiency and Autoimmune Disorders

Four Tyrosine Residues in Phospholipase C-γ2, Identified as Btk-dependent Phosphorylation Sites, Are Required for B Cell Antigen Receptor-coupled Calcium Signaling

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Watanabe, Dai, Hashimoto, Shoji, Ishiai, Masamichi, Matsushita, Masato, Baba, Yoshihiro, Kishimoto, Tadamitsu, Kurosaki, Tomohiro, Tsukada, Satoshi·2001·Journal of Biological Chemistry

Abstract

Activation of phospholipase C-gamma2 (PLCgamma2) is the critical step in B cell antigen receptor (BCR)-coupled calcium signaling. Although genetic dissection experiments on B cells have demonstrated that Bruton's tyrosine kinase (Btk) and Syk are required for activating PLCgamma2, the exact activation mechanism of PLCgamma2 by these kinases has not been established. We identify the tyrosine residues 753, 759, 1197, and 1217 in rat PLCgamma2 as Btk-dependent phosphorylation sites by using an in vitro kinase assay. To evaluate the role of these tyrosine residues in phosphorylation-dependent activation of PLCgamma2, PLCgamma2-deficient DT40 cells were reconstituted with a series of mutant PLCgamma2s in which the phenylalanine was substituted for tyrosine. Substitution of all four tyrosine residues almost completely eliminated the BCR-induced PLCgamma2 phosphorylation, indicating that these residues include the major phosphorylation sites upon BCR engagement. Cells expressing PLCgamma2 with a single substitution exhibited some extent of reduction in calcium mobilization, whereas those expressing quadruple mutant PLCgamma2 showed greatly reduced calcium response. These findings indicate that the phosphorylations of the tyrosine residues 753, 759, 1197, and 1217, which have been identified as Btk-dependent phosphorylation sites in vitro, coordinately contribute to BCR-induced activation of PLCgamma2.

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  1. Coggeshall, K. M., McHugh, J. C., and Altman, A. (1992) Proc. Natl. Acad. Sci.
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Authors
Watanabe, D., Hashimoto, S., Ishiai, M., Matsushita, M., Baba, Y., Kishimoto, T., Kurosaki, T., & Tsukada, S.
Affiliations
  • The University of Osaka (JP)
  • Kansai Medical University (JP)
Corresponding author
Tsukada, Satoshi
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-10
Volume
276
Issue
42
Pages
38595-38601
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2057525817
Cited by
136
References
57
Citations by year
2026: 5 · 2025: 4 · 2024: 5 · 2023: 5 · 2022: 6 · 2021: 6 · 2020: 2 · 2019: 7 · 2018: 5 · 2017: 3 · 2016: 2 · 2015: 2 · 2014: 4 · 2013: 2 · 2012: 8
FWCI
3.38
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
Ministry of Education, Culture, Sports, Science and Technology
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Immunology and Microbiology › Immunology › Immunodeficiency and Autoimmune Disorders
Keywords
PLCγ2, Bruton's tyrosine kinase, tyrosine phosphorylation sites, B cell receptor signaling, calcium signaling, Syk, DT40 cells
MeSH terms
Agammaglobulinaemia Tyrosine Kinase, Amino Acid Sequence, Animals, Binding Sites, Calcium, Cell Line, Enzyme Activation, Genetic Vectors, Glutathione Transferase, Humans, Hydrolysis, Isoenzymes, Molecular Sequence Data, Mutation, Phenylalanine, Type C Phospholipases, Phosphorylation, Precipitin Tests, Protein-Tyrosine Kinases, Receptors, Antigen, B-Cell, Recombinant Fusion Proteins, Time Factors, Transfection, Tyrosine, Immunoblotting, Signal Transduction, Sequence Homology, Amino Acid, DNA, Complementary, Rats, Phospholipase C gamma

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