| 1996 |
The dual phosphorylated FcεRIγ ITAM binds to the tandem SH2 domains of p72Syk with high affinity (Kd ~1.4 nM); both SH2 domains contribute cooperatively, with the preferred orientation placing the N-terminal phosphotyrosine at the C-terminal SH2 domain and the C-terminal phosphotyrosine at the N-terminal SH2 domain. Monophosphorylated peptides bind with substantially lower affinity. |
Scintillation proximity assay with 125I-labeled ITAM peptides, competition binding with C-terminal and N-terminal SH2 domain knockouts, saturation binding isotherms |
The Journal of biological chemistry |
High |
8810294
|
| 1998 |
FcεRIγ can substitute for ζ/η chains as a signal-transducing subunit in TCR complexes during T cell development; mice lacking all three ζ-family members (ζ, η, FcεRIγ) still generate low numbers of αβ-T cells, demonstrating that TCR surface complexes lacking any ζ-family dimer can transduce developmental signals. ζ/η and FcεRIγ have distinct expression patterns correlated with thymus dependency. |
Genetic knockout mice lacking ζ/η, FcεRIγ, or all three; T cell development phenotyping by flow cytometry |
The Journal of experimental medicine |
High |
9529325
|
| 1999 |
PIR-A3 physically interacts with FcεRIγ via an arginine residue (Arg632) in the PIR-A3 transmembrane domain; this interaction is required for PIR-A3 to deliver activation signals (nitric oxide production synergizing with IFN-γ) in macrophages. |
Cotransfection of CD4-PIR-A3 chimeric receptors in 293T cells, co-immunoprecipitation with endogenous FcεRIγ in ANA-1 macrophages, Arg632 point mutant, nitric oxide assay |
Blood |
High |
10477705
|
| 2003 |
FcεRIγ expression is rate-limiting for surface expression of the high-affinity IgE receptor (FcεRI) on dendritic cells. Without FcεRIγ, FcεRIα accumulates as an immature, core-glycosylated form in the ER; co-expression of FcεRIγ allows FcεRIα to acquire complex glycosylation and traffic through the Golgi to the cell surface. FcεRIγ co-precipitates with FcεRIα. |
Co-immunoprecipitation, Western blot (glycosylation analysis), confocal microscopy/colocalization, monocyte-derived DC differentiation from atopic vs. normal donors |
The Journal of clinical investigation |
High |
12671054
|
| 2004 |
Rat NKp46 associates with both FcεRIγ and CD3ζ as signal-transducing adaptor proteins, enabling NK cell cytotoxicity; this was demonstrated by co-immunoprecipitation from IL-2-activated NK cell lysates and confirmed by redirected lysis and F(ab')2 blocking assays. |
Immunoprecipitation/Western blot, redirected lysis assay, F(ab')2 blocking |
Journal of leukocyte biology |
Medium |
15356098
|
| 2007 |
Antiallergic drug azelastine inhibits IgE-induced phosphorylation of FcεRIγ ITAM tyrosines in RBL-2H3 cells without affecting FcεRIγ mRNA or protein levels or the amount of γ chain assembled into IgE-bound FcεRI, indicating that ITAM tyrosine phosphorylation is a discrete step required for FcεRI signaling cascade initiation. |
Immunoprecipitation, Western blot for phospho-γ chain, Northern blot for mRNA levels, pharmacological inhibition in RBL-2H3 cells |
International immunopharmacology |
Medium |
17499203
|
| 2011 |
Hypomethylation of the FCER1G promoter drives FcεRIγ transcription and surface FcεRI expression on monocytes; patch methylation luciferase reporter assay confirmed direct methylation-dependent repression of the FCER1G promoter, and treatment of healthy monocytes with 5-azacytidine reduced methylation and induced FcεRIγ transcription and surface FcεRI. |
Bisulfite sequencing, patch methylation luciferase reporter assay, 5-azacytidine demethylation, real-time RT-PCR, Western blot, flow cytometry |
Allergy |
High |
22150093
|
| 2013 |
Mincle and MCL form heteromers on the cell surface; MCL associates with FcεRIγ via Mincle, forming a Mincle/MCL/FcεRIγ trimeric complex. Association with MCL and FcεRIγ increases Mincle surface expression and enhances phagocytosis of antibody-coated beads. |
Co-immunoprecipitation, flow cytometry, phagocytosis assay in rat primary cells and cell lines |
European journal of immunology |
Medium |
23921530
|
| 2013 |
FCER1G promoter activity is methylation-sensitive: full methylation of the promoter regulatory element reduces luciferase reporter activity to ~36% of mock-methylated controls, directly demonstrating that DNA methylation represses FCER1G transcription. |
Patch-methylation luciferase reporter assay with full vs. mock methylated FCER1G promoter constructs |
Zhong nan da xue xue bao. Yi xue ban |
Medium |
23456064
|
| 2014 |
Type II phosphatidylinositol 4-kinases (PtdIns 4-kinases) physically associate with the FcεRIγ subunit; this association increases threefold upon FcεRI ligation, and mutation of both canonical ITAM tyrosines (Y65 and Y76) abolishes the interaction, demonstrating that ITAM tyrosines are required for PtdIns 4-kinase coupling to FcεRIγ. |
Anti-FcεRIγ immunoprecipitation with PtdIns 4-kinase activity assay, ITAM tyrosine point mutants (Y65F, Y76F), RBL-2H3 cells |
Molecular and cellular biochemistry |
Medium |
24481753
|
| 2017 |
FcεRIγ (Fcer1g) on non-B myeloid APCs negatively regulates B cell responses; mice lacking Fcer1g showed a markedly enhanced and prolonged extrafollicular plasmablast response, and this enhancement was CD40L-dependent, placing FcεRIγ on myeloid APCs in a pathway that downregulates T cell help. |
Adoptive transfer into Fcer1g-/- and Myd88-/- recipient mice, flow cytometry, antibody response quantification, CD40L blockade epistasis |
Journal of immunology |
Medium |
28659358
|
| 2018 |
FcεRIγ is required for NKp30 cell-surface expression and function in IL-15-induced NKp30+CD8+ T cells; concomitant induction of FcεRIγ (via promoter demethylation) and NKp30 occurs, and FcεRIγ acquisition correlates with Syk and PLZF expression, enabling NK-like antitumor cytotoxicity. |
IL-15 stimulation of CD8+ T cells, flow cytometry, promoter demethylation analysis, in vitro cytotoxicity assays, xenograft mouse model |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
29895693
|
| 2019 |
FcεRIγ on NK cells stabilizes NKp46 surface expression and limits NK cell ability to restrain virus-specific CD8+ T cells during LCMV infection; Fcer1g-/- mice showed enhanced CD8+ T cell responses and rapid viral control. FcεRIγ did not affect NKp46 mRNA but specifically stabilized its surface protein. |
Fcer1g-/- mice (genetic KO), flow cytometry for NKp46 and other activating receptors, viral load quantification, CD8+ T cell expansion measurement during LCMV infection |
PLoS pathogens |
High |
31220194
|
| 2019 |
DCAR1, a C-type lectin receptor on rat myeloid cells, associates with FcεRIγ as its activating adaptor protein, enabling efficient phagocytosis of antibody-coated beads and reactive oxygen species production upon DCAR1 crosslinking on eosinophils. |
Co-immunoprecipitation, phagocytosis assay, ROS assay, monoclonal antibody-based characterization |
Frontiers in immunology |
Medium |
31134097
|
| 2019 |
Syk recruitment to FcεRIγ involves multivalent cis and trans docking configurations on γ homodimers; multivalent interactions improve cis-oriented binding by ~1000-fold. Autophosphorylation of Syk Y130 in interdomain A alters the bias for cis binding. Short distances between paired γ ITAM pairs are required for trans docking, as demonstrated in γ-KO cells reconstituted with disulfide-linked γ subunits or monomeric ITAM/hemITAM γ-chimeras. |
Molecular dynamics simulation, hybrid MD/worm-like chain polymer modeling, live cell imaging, reconstitution in γ-KO cells with disulfide-linked γ and chimeric ITAM constructs, phosphomimetic Y130E Syk mutant |
Molecular biology of the cell |
High |
31216232
|
| 2021 |
Rhesus macaque activating KIR (KIR3DS05), which contains a positively charged arginine in its transmembrane domain, associates with FcεRIγ (not DAP12) as its signal-transducing adaptor; this association results in increased and stabilized KIR3DS05 surface expression. Ligand binding (Mamu-A1*001 and A1*011) triggers signal transduction in the presence of FcεRIγ but not DAP12. |
Co-immunoprecipitation of transfected and primary cells, flow cytometry, signaling assays with specific MHC-I ligands |
Frontiers in immunology |
Medium |
33968088
|
| 2022 |
FcεRIγ (FcRγ) upregulation in NK cells is dependent on cell proliferation driven by IL-2, IL-15, or IL-12, sensitive to mTOR suppression, and inhibited by TGFβ or IFNα; diminished proliferation (e.g., rapamycin treatment) leads to adaptive-like FcRγ-/low NK cell phenotype. Lower FcRγ protein expression was observed in NK cells during rapamycin treatment in vivo. |
Flow cytometry in lung transplant patients on rapamycin, cytokine stimulation experiments, mTOR inhibitor treatment, TGFβ/IFNα treatment of NK cells |
The Journal of experimental medicine |
Medium |
36066491
|
| 2024 |
Covalent small molecules identified by HTS disrupt the interaction between the FCER1G phospho-ITAM and the SYK tandem SH2 domains (SYK-tSH2) by covalently modifying SYK-tSH2; the FCER1G p-ITAM interaction with SYK-tSH2 enables SYK activation via phosphorylation. |
High-throughput screen, TR-FRET binding assay, orthogonal protein-protein interaction assay, biochemical and biophysical characterization of inhibitor binding |
PloS one |
Medium |
38359047
|
| 2025 |
USP5 deubiquitylase interacts with FcεRIγ in mast cells, reverses K48-linked polyubiquitylation of FcεRIγ (added by E3 ligase Cbl-b), and thereby stabilizes FcεRIγ protein. USP5 knockdown increases Cbl-b binding to FcεRIγ, enhancing its polyubiquitylation and degradation, and attenuates IgE-induced mast cell activation (β-hexosaminidase/histamine release) and allergic inflammation in mice. |
Co-immunoprecipitation, ubiquitylation assays (K48-linkage specific), siRNA knockdown of USP5 in mast cells and HEK293T cells, USP5 inhibitor WP1130, in vivo mouse allergy models |
Science signaling |
High |
40729432
|
| 2026 |
In double-negative T (DNT) cells, FcεRIγ mediates IgG1-stimulated antibody-dependent cellular cytotoxicity (ADCC) against tumor cells via the FcεRIγ/Syk/AKT/NF-κB signaling pathway; Fcer1g-deficient DNT cells failed to respond to IgG1 stimulation, and Syk inhibition reduced cytotoxicity and phosphorylation of AKT and NF-κB. Combined DNT cells + tumor antibody therapy was abolished by Fcer1g deficiency in subcutaneous tumor models. |
Fcer1g knockout DNT cells, in vitro cytotoxicity assays, Syk inhibitor, Western blot for pathway phosphorylation (AKT, NF-κB), subcutaneous mouse tumor model |
Journal of molecular cell biology |
Medium |
41481135
|