| 2000 |
CalDAG-GEFIII (RasGRP3) functions as a guanine nucleotide exchange factor (GEF) with broad substrate specificity, directly catalyzing GDP-to-GTP exchange on Ha-Ras, R-Ras, and Rap1 in vitro and in cells, and activating ERK/MAPK signaling. |
In vitro GEF assay (GTP/GDP ratio measurement), transfection in 293T cells, PC12 neuronal differentiation assay |
The Journal of biological chemistry |
High |
10835426
|
| 2001 |
RasGRP3 binds phorbol esters via its C1 domain in an anionic phospholipid-dependent manner, and phorbol ester or diacylglycerol (DAG) binding causes RasGRP3 translocation to the plasma membrane/perinuclear area and activates its Ras exchange activity in intact cells. |
Phorbol ester binding assay, GFP-RasGRP3 fluorescence microscopy, RasGTP pull-down, ERK phosphorylation assay in HEK-293 cells |
Cancer research |
High |
11221888
|
| 2003 |
RasGRP3 is phosphorylated upon BCR stimulation coincident with Ras activation; PKC inhibition attenuates both RasGRP3 phosphorylation and Ras activation. PKC-theta and PKC-beta2 phosphorylate RasGRP3 in vitro, and a dominant-active PKC-theta enhances Ras-ERK signaling via RasGRP3 when co-expressed in HEK-293 cells. |
In vitro kinase assay with PKC-theta and PKC-beta2, co-expression with dominant-active PKC-theta, PKC inhibitor studies, membrane fractionation, Ras activation assay |
Blood |
High |
12730099
|
| 2004 |
PKC phosphorylates RasGRP3 specifically on Thr133; the Thr133Ala substitution abolishes PKC-dependent phosphorylation in vitro and severely impairs RasGRP3-mediated Ras activation in vivo after BCR stimulation. PKC activity (conventional PKCs) is required for Thr133 phosphorylation and full Ras-ERK activation. |
Mass spectrometry to identify phosphorylation site, in vitro kinase assay, site-directed mutagenesis (Thr133Ala), antiphospho-peptide antibody, PKC inhibitors, BCR stimulation of B cells |
Blood |
High |
15545601 15657177
|
| 2004 |
PKCdelta physically associates with RasGRP3 upon PMA treatment (co-immunoprecipitation, colocalization in perinuclear region) and phosphorylates RasGRP3 in vitro; a PKCdelta kinase-dead mutant blocks the PMA-induced mobility shift of RasGRP3. |
Co-immunoprecipitation, in vitro kinase assay, immunofluorescence colocalization, dominant-negative PKCdelta, rottlerin inhibitor |
Molecular pharmacology |
High |
15213298
|
| 2004 |
RasGRP3 activates Rap2B, leading to Rap2B-dependent translocation of PLC-epsilon to the plasma membrane and PLC/Ca2+ signaling downstream of the EGF receptor. EGF induces tyrosine phosphorylation of RasGRP3 by c-Src, and c-Src inhibition blocks both Rap2B activation and PLC stimulation. |
Dominant-negative Rap2B expression, clostridial toxin inactivation, co-expression of RasGRP3, GTP-loading assay for Rap2B, c-Src inhibition, Ca2+ signaling measurement in HEK-293 cells |
Molecular and cellular biology |
High |
15143162
|
| 2004 |
RasGRP3 is expressed in embryonic blood vessels and is specifically required for the aberrant endothelial morphogenesis induced by phorbol ester (PMA); RasGRP3 loss-of-function makes vessels refractory to PMA-induced dysmorphogenesis. RasGRP3 expression is upregulated by VEGF stimulation of endothelial cells. |
ES cell gene trap screen, in situ hybridization, loss-of-function mouse model, ES cell-derived vascular morphogenesis assay |
Molecular and cellular biology |
High |
15572660
|
| 2005 |
Both RasGRP1 and RasGRP3 contribute to BCR-induced Ras and ERK activation in B cells; RasGRP3 alone maintains basal Ras-GTP levels in resting B cells. Loss of RasGRP3 causes isotype-specific antibody deficiencies and hypogammaglobulinemia. BCR-induced B cell proliferation is RasGRP1- and RasGRP3-dependent. |
Single and double null mutant mice (Rasgrp1-/-, Rasgrp3-/-, double KO), Ras-GTP pull-down, ERK phosphorylation, B cell proliferation assays, serum immunoglobulin measurement |
Journal of immunology |
High |
16301621
|
| 2005 |
Fluorescent phorbol esters induce translocation of RasGRP3 to intracellular membranes (primarily perinuclear/intracellular), and RasGRP3 colocalizes with the fluorescent phorbol ester. The lipophilicity of the phorbol ester determines kinetics and pattern of RasGRP3 redistribution. |
Fluorescent phorbol ester live-cell imaging, GFP-RasGRP3 fusion protein colocalization in CHO cells |
Molecular cancer therapeutics |
Medium |
15657361
|
| 2005 |
RasGRP3 mediates phorbol ester-induced exocytosis in a PKC-independent manner; RasGRP3 is expressed in endocrine tissues and its effects on exocytosis are not blocked by MEK inhibitor but are partially sensitive to PKC inhibitor. |
Exocytosis assay in endocrine cells, PKC inhibitor, MEK inhibitor, ERK phosphorylation readout |
Biochemical and biophysical research communications |
Medium |
15737652
|
| 2006 |
RasGRP3 interacts with dynein light chain 1 (DLC1) through its C-terminal 127 amino acids; this interaction was confirmed in vitro and by co-immunoprecipitation. Deletion of the C-terminal domain abolishes DLC1 interaction and dramatically alters RasGRP3 subcellular localization (strong reticular/perinuclear/nuclear distribution). |
Yeast two-hybrid screen, in vitro pull-down, co-immunoprecipitation, subcellular localization of truncation mutant (fluorescence microscopy) |
The Journal of biological chemistry |
High |
17012239
|
| 2010 |
RasGRP3 is required for Ras-GTP formation, AKT and ERK1/2 phosphorylation, cell proliferation, migration, and anchorage-independent growth in prostate cancer cells. RasGRP3 overexpression in LNCaP cells elevates Ras-GTP, stimulates proliferation, and confers resistance to PMA-induced apoptosis. |
siRNA knockdown and overexpression, Ras-GTP pull-down, AKT/ERK phosphorylation, proliferation assay, migration assay, mouse xenograft |
Cancer research |
High |
20876802
|
| 2011 |
RasGRP3 is required for Ras-GTP formation, Akt phosphorylation, c-Met expression, and cell proliferation/transformation in human melanoma cells. Overexpression of RasGRP3 in primary melanocytes alters morphology and induces tumorigenicity in mouse xenografts. |
siRNA knockdown, overexpression in primary melanocytes, Ras-GTP pull-down, Akt phosphorylation, soft agar colony formation, mouse xenograft |
Oncogene |
High |
21602881
|
| 2011 |
RasGRP3 in endothelial cells promotes Ras-ERK signaling and endothelin-1-stimulated cell migration; Rasgrp3 loss-of-function attenuates Ras-ERK signaling and abolishes endothelin-1-induced migration, and embryos lacking Rasgrp3 are dramatically protected from diabetes-induced vascular developmental defects. |
Loss-of-function mouse model (Rasgrp3 null), endothelial cell migration assay, Ras-ERK signaling measurement, diabetic mouse model, primary endothelial cells with activated RasGRP3 |
Circulation research |
High |
21474816
|
| 2014 |
RasGRP3 activates Rap1 upon low-level TLR stimulation in macrophages, which limits production of pro-inflammatory cytokines (especially IL-6). CRISPR-Cas9 deletion of RasGRP3 in RAW264.7 cells inhibits TLR3/4/9-induced Rap1 activation while enhancing ERK1/2 activation and IL-6 production. |
CRISPR-Cas9 knockout in RAW264.7, Rap1 activity assay, ERK1/2 phosphorylation, cytokine ELISA, DSS-colitis and collagen-induced arthritis mouse models |
Nature communications |
High |
25118589
|
| 2015 |
RasGRP3 interacts with Arp3 (actin-related protein), as identified by pull-down/mass spectrometry and confirmed by co-immunoprecipitation and immunofluorescence. PMA-induced translocation of RasGRP3 increases its association with Arp3. Arp3 silencing partially reduces RasGRP3-mediated glioma cell migration. |
Pull-down assay with mass spectrometry, co-immunoprecipitation, immunofluorescence colocalization, siRNA knockdown of Arp3, migration assay |
Oncotarget |
Medium |
25682201
|
| 2017 |
In GNAQ-mutant uveal melanoma, RasGRP3 is phosphorylated and activated by PKC-delta and PKC-epsilon, enabling Ras-MAPK pathway activation. RasGRP3 activation also occurs through PKC-independent DAG-mediated membrane recruitment. RasGRP3 knockdown suppresses MAPK activation, identifying RasGRP3 as the mechanistic link between Gαq signaling and MAPK in uveal melanoma. |
Knockdown (siRNA/shRNA), PKC isoform-specific studies, Ras-GTP assay, ERK phosphorylation, membrane fractionation, uveal melanoma cell lines and patient samples |
Cancer cell |
High |
28486107
|
| 2018 |
In a GNA11Q209L mouse model, RasGRP3 is specifically required for GNAQ/GNA11-driven Ras activation and tumorigenesis; integrative transcriptome analysis identified RasGRP3 as selectively expressed in Gq-driven melanomas, and its loss suppresses tumor formation. |
Transgenic GNA11Q209L mouse model, Bap1 conditional KO, integrative transcriptome analysis, RasGRP3 knockdown in human UM cell lines, Ras activation assay, in vivo tumor models |
Cell reports |
High |
29490280
|
| 2018 |
Alpha-arylidene DAG-lactones can selectively bind the RasGRP3 C1 domain with up to 73-fold selectivity over PKCα and 45-fold over PKCε in vitro, and selectively activate Ras (via RasGRP3) over PKCδ phosphorylation in intact cells. |
In vitro C1-domain binding assay (competitive displacement), intact cell Ras activation assay, PKCδ phosphorylation assay |
Journal of medicinal chemistry |
Medium |
29860841
|
| 2023 |
In NPM1-mutant AML, cytoplasmic NPM1-mA binds E3 ubiquitin ligase MID1, blocking MID1-mediated degradation of RasGRP3 and thus stabilizing RasGRP3 protein. Stabilized RasGRP3 activates the EGFR-STAT3 axis to promote AML cell proliferation and autophagy. |
Co-immunoprecipitation, Western blot, cycloheximide chase assay, CCK8, EdU staining, immunofluorescence |
Journal of leukocyte biology |
Medium |
36826998
|
| 2023 |
AC092894.1 lncRNA acts as a scaffold mediating USP3-dependent de-ubiquitination of AR, which then drives transcription of RASGRP3 to sustain MAPK signaling in colorectal cancer cells; loss of this axis promotes oxaliplatin resistance. |
RNA pull-down, RIP, co-immunoprecipitation, gain/loss-of-function experiments, in vivo mouse model |
BMC medicine |
Medium |
37013584
|
| 2026 |
RasGRP3 promotes RAP1B GTP-loading (exchange factor activity) in endothelial cells, thereby inhibiting NF-κB pathway activation and reducing pro-inflammatory cytokine production and monocyte adhesion. UHRF1 (E3 ubiquitin ligase) binds RasGRP3 and promotes its ubiquitination and degradation; UHRF1 knockdown increases RasGRP3 protein levels. |
RasGRP3 overexpression in endothelial cells and ApoE-/- mice, RAP1 activity assay, NF-κB pathway assay, cytokine ELISA, THP-1 adhesion assay, co-immunoprecipitation for UHRF1-RasGRP3 interaction |
Inflammation |
Medium |
41689678
|