| 1996 |
The dual phosphorylated FcεRIγ ITAM binds to the tandem SH2 domains of p72Syk with high affinity (Kd ~1.4 nM), requiring both tyrosine residues to be phosphorylated; both N-terminal and C-terminal SH2 domains contribute cooperatively, with the preferred binding orientation having the N-terminal phosphotyrosine occupying the C-terminal SH2 domain and vice versa. |
Scintillation proximity assay with 125I-labeled phosphopeptides, competition binding, SH2 domain knockout constructs |
The Journal of biological chemistry |
High |
8810294
|
| 1998 |
FcεRIγ (Fcgamma) functions as a signal-transducing subunit in TCR complexes; in the absence of zeta/eta chains, FcεRIγ can partially substitute, but T cells lacking all three zeta-family members (zeta, eta, FcεRIγ) still develop some αβ-T cells via zeta-family-independent surface complexes. FcεRIγ and zeta/eta have distinct expression patterns that impart distinctive signaling properties to TCR complexes on specific T cell populations. |
Triple knockout mouse generation (zeta/eta/FcεRIγ-deficient), flow cytometry, phenotypic comparison of single and compound knockouts |
The Journal of experimental medicine |
High |
9529325
|
| 1999 |
PIR-A3 physically interacts with FcεRIγ through its transmembrane domain arginine residue (Arg632); this interaction is required for PIR-A3-mediated macrophage activation (synergy with IFN-γ for nitric oxide production). |
Chimeric receptor cotransfection in 293T cells and ANA-1 macrophages, co-immunoprecipitation, nitric oxide functional assay with point mutants |
Blood |
High |
10477705
|
| 2003 |
FcεRIγ is mandatory for surface expression of FcεRI on dendritic cells; without FcεRIγ, the FcεRIα chain accumulates in the ER in an immature, core-glycosylated form. When FcεRIγ is present (as in atopic DCs), it co-precipitates with FcεRIα, allowing maturation and complex glycosylation of FcεRIα and its transport through the Golgi to the cell surface. |
Co-immunoprecipitation, subcellular fractionation/colocalization (ER vs. Golgi), Western blot for glycosylation state, flow cytometry |
The Journal of clinical investigation |
High |
12671054
|
| 2004 |
Rat NKp46 associates with both FcεRIγ and CD3ζ (ITAM-bearing adaptor proteins) in NK cells, enabling NK cell cytotoxic activation by similar pathways as CD16. |
Immunoprecipitation and Western blot from IL-2-activated NK cell lysates, redirected lysis assay with antibody F(ab')2 fragments |
Journal of leukocyte biology |
Medium |
15356098
|
| 2007 |
IgE-mediated phosphorylation of FcεRIγ ITAM tyrosines is inhibited by the antiallergic drug azelastine in RBL-2H3 cells, without affecting FcεRI subunit mRNA or protein levels or assembly; this identifies ITAM phosphorylation as the drug's target in blocking FcεRI signaling cascade initiation. |
Immunoprecipitation of IgE-bound FcεRI, Western blot with anti-phosphotyrosine, northern blot for mRNA levels |
International immunopharmacology |
Medium |
17499202
|
| 2011 |
Hypomethylation of the FCER1G promoter directly drives increased FcεRIγ transcription and surface FcεRI expression on monocytes; patch methylation of the promoter reduced luciferase reporter activity ~2.8-fold, and treatment with 5-azacytidine caused promoter demethylation and induced FcεRIγ transcription and FcεRI surface expression in healthy monocytes. |
Bisulfite sequencing, patch-methylation luciferase reporter assay, 5-azacytidine treatment, real-time RT-PCR, flow cytometry |
Allergy |
High |
22150093
|
| 2013 |
Mincle and MCL form heteromers on the cell surface; MCL associates with FcεRIγ via Mincle (not directly), forming a Mincle/MCL/FcεRIγ trimeric complex. Association with MCL and FcεRIγ increased Mincle surface expression and enhanced phagocytosis of antibody-coated beads. |
Flow cytometry, co-immunoprecipitation from rat primary cells and cell lines, phagocytosis assay |
European journal of immunology |
High |
23921530
|
| 2014 |
Type II phosphatidylinositol 4-kinases (PtdIns 4-kinases) associate with the FcεRIγ subunit via the ITAM tyrosine residues (Y65 and Y76); FcεRI ligation increases this association threefold, and mutation of both ITAM tyrosines abolishes the interaction. |
Anti-FcεRIγ immunoprecipitation with kinase activity assay, ITAM tyrosine mutants in RBL-2H3 cells |
Molecular and cellular biochemistry |
Medium |
24481753
|
| 2017 |
FcεRIγ (Fcer1g) on myeloid APCs plays a regulatory role in limiting B cell extrafollicular plasmablast responses; mice lacking Fcer1g (in non-B cells) showed markedly enhanced and prolonged anti-self autoantibody responses, an effect dependent on CD40L, indicating FcRγ on myeloid cells downregulates T cell help. |
Adoptive transfer of autoreactive B cells into Fcer1g-/- recipient mice, flow cytometry, CD40L-blocking antibody epistasis |
Journal of immunology |
Medium |
28659358
|
| 2018 |
IL-15 induces de novo FcεRIγ expression in a CD8+ T cell subset, and FcεRIγ is required for NKp30 surface expression and function in these cells; FcεRIγ expression required promoter demethylation and was accompanied by acquisition of Syk and PLZF. |
Flow cytometry, intracellular staining, promoter methylation analysis, siRNA knockdown of FcεRIγ with functional NKp30 surface expression readout, xenograft mouse model |
Proceedings of the National Academy of Sciences of the United States of America |
High |
29895693
|
| 2019 |
Syk binds FcεRIγ ITAM via multivalent cis and trans configurations of its tandem SH2 domains; multivalent interactions improve cis-oriented binding by ~three orders of magnitude. Syk autophosphorylation on Y130 in interdomain A modulates the cis/trans binding bias. Short distances between γ ITAM pairs are required for trans docking. |
Molecular dynamics simulation, hybrid MD/worm-like chain polymer modeling, live cell imaging in γ-KO reconstituted cells expressing disulfide-linked γ subunits or monomeric ITAM/hemITAM chimeras, Y130E phosphomimetic mutant analysis |
Molecular biology of the cell |
High |
31216232
|
| 2019 |
FcεRIγ stabilizes NKp46 expression on NK cells; Fcer1g-/- NK cells have reduced NKp46 but normal levels of other activating receptors, and this specifically limits their ability to regulate virus-specific CD8+ T cell responses during chronic LCMV infection. |
Fcer1g-/- mice, flow cytometry for NK receptor expression, LCMV infection model, adoptive transfer experiments |
PLoS pathogens |
High |
31220194
|
| 2019 |
DCAR1 associates with FcεRIγ adaptor protein; this association enables efficient phagocytosis of antibody-coated beads and cross-linking of DCAR1 leads to reactive oxygen species production in eosinophils. |
Co-immunoprecipitation, phagocytosis assay with antibody-coated beads, ROS production assay |
Frontiers in immunology |
Medium |
31134097
|
| 2021 |
Rhesus macaque activating KIRs associate with FcεRIγ (not DAP12) through a positively charged arginine in their transmembrane region; this association results in increased and stabilized surface expression of KIR3DS05 and enables signal transduction upon ligand binding. |
Co-immunoprecipitation from transfected and primary cells, flow cytometry for surface expression, functional signaling assays |
Frontiers in immunology |
Medium |
33968088
|
| 2022 |
FcεRIγ upregulation in NK cells is dependent on cell proliferation mediated by IL-2, IL-15, or IL-12, is sensitive to mTOR suppression, and is inhibited by TGFβ or IFNα; diminished proliferation drives the adaptive-like FcεRIγ-low NK cell phenotype. |
Pharmacological mTOR inhibition (rapamycin) in vivo and in vitro, cytokine stimulation/blocking, flow cytometry for FcεRIγ protein, proliferation assays |
The Journal of experimental medicine |
Medium |
36066491
|
| 2023 |
Inhibition of FCER1G in CD4+ T cells (via DNA hypermethylation of its promoter) mediates resistance to cyclosporin A plus corticosteroid treatment; CLB reverses this resistance by inducing FCER1G expression through DNA demethylation. |
RNA sequencing, TMT proteomics, gain- and loss-of-function assays, rescue assays, methylation analysis of FCER1G promoter in patient CD4+ T cells |
Clinical immunology |
Medium |
37821074
|
| 2024 |
The doubly phosphorylated FCER1G ITAM peptide binds the tandem SH2 domains of SYK (SYK-tSH2), enabling SYK activation via phosphorylation; covalent small molecules targeting SYK-tSH2 can disrupt this interaction, inhibiting SYK activation. |
Biochemical binding assay (TR-FRET), biophysical orthogonal assays, high-throughput screening, covalent inhibitor characterization |
PloS one |
Medium |
38359047
|
| 2025 |
USP5 deubiquitylase interacts with FcεRIγ in mast cells, removing K48-linked polyubiquitin chains to stabilize FcεRIγ protein; USP5 knockdown increased binding of the E3 ligase Cbl-b to FcεRIγ, leading to increased polyubiquitylation and degradation of FcεRIγ, and attenuated IgE-induced mast cell activation and allergic inflammation. |
Co-immunoprecipitation, USP5 knockdown, Cbl-b interaction assay, ubiquitylation assay (K48-linkage specific), USP5 inhibitor (WP1130) in mouse allergy model, β-hexosaminidase/histamine release assay |
Science signaling |
High |
40729432
|
| 2026 |
FcεRIγ mediates antibody-dependent cellular cytotoxicity (ADCC) in double-negative T (DNT) cells by activating the FcεRIγ/Syk/AKT/NF-κB signaling pathway upon IgG1 binding; Fcer1g-deficient DNT cells fail to respond to IgG1 stimulation and show no enhancement of tumor cell killing. |
Fcer1g-deficient DNT cells, Syk inhibition, flow cytometry for IgG Fc receptor/cytotoxic molecule expression, in vitro cytotoxicity assay, subcutaneous tumor model, Western blot for AKT and NF-κB phosphorylation |
Journal of molecular cell biology |
Medium |
41481135
|