| 2009 |
Purified recombinant TIG3 (PLAAT4) functions as a Ca2+-independent phospholipase A1/2 with maximal activity of 0.53 µmol/min/mg, active on phosphatidylcholines and phosphatidylethanolamines, with PLA1 activity predominating over PLA2. TIG3 also catalyzes N-acylation of PE and O-acylation of lyso-PC at relatively low rates. |
In vitro enzymatic assay with purified recombinant protein; substrate specificity profiling |
Biochimica et biophysica acta |
High |
19615464
|
| 2010 |
The N-terminal hydrophilic region of TIG3 (residues 1–134) is sufficient for Ca2+-independent phospholipase A2 enzymatic activity, while the C-terminal hydrophobic region is important for cellular localization rather than catalysis. |
Expression and purification of truncated N-terminal domain; in vitro phospholipase activity assay; limited proteolysis mapping structural domain boundaries |
Protein expression and purification |
High |
20100577
|
| 2000 |
The C-terminal hydrophobic domain of TIG3 is required for perinuclear/membrane localization and for full growth-suppressive activity. Truncated TIG3 lacking this domain (TIG3 1–134) redistributes to the cytoplasm and shows partial loss of colony-suppression activity. |
Vector-mediated expression of full-length vs. C-terminal truncation mutants; GFP-fusion localization by fluorescence microscopy; colony formation assay in CHO, T47D and HaCaT cells |
International journal of oncology |
High |
11078805
|
| 2007 |
TIG3 interacts with type I transglutaminase (TG1) through a domain spanning amino acids 112–164. The N-terminal conserved region of TIG3 is required for keratinocyte differentiation; its removal converts TIG3 into a proapoptotic protein characterized by cell rounding, membrane blebbing, cytochrome c release, and caspase-3/PARP cleavage. Loss of the N-terminal region also shifts TIG3 to increased membrane association. |
Co-precipitation of TG1 with TIG3 truncation mutants; apoptosis assays (cytochrome c release, caspase-3/PARP cleavage, p53/p21 levels); fluorescence localization of mutant series |
The Journal of investigative dermatology |
High |
17762858
|
| 2008 |
TIG3 interacts with and activates type I transglutaminase (TG1) to promote cornified envelope formation during keratinocyte terminal differentiation. TIG3 expression in the suprabasal epidermis is associated with TG1 activation. |
Co-immunoprecipitation; transglutaminase activity assay; immunofluorescence localization in epidermis |
Amino acids |
Medium |
18612777
|
| 2011 |
TIG3 localizes near the centrosome in squamous cell carcinoma cells, and pericentrosomal accumulation of TIG3 alters microtubule and microfilament organization, drives pericentrosomal organelle clustering (a hallmark of apoptosis), reduces cyclin D1/E/A, increases p21, elevates Bax, reduces Bcl-XL, and promotes cleavage of procaspase-3/-9 and PARP. |
Fluorescence microscopy of GFP-TIG3; organelle distribution assays; Western blot for cell-cycle and apoptosis markers in SCC-13 cells expressing TIG3 |
PloS one |
Medium |
21858038
|
| 2012 |
TIG3 colocalizes with γ-tubulin and pericentrin at the centrosome, alters microtubule nucleation and anterograde growth, increases α-tubulin acetylation and detyrosination, increases insoluble tubulin, drives formation of a peripheral microtubule ring, suppresses centrosome separation (but not duplication), and reduces cell proliferation. |
Immunofluorescence co-localization with centrosome markers; microtubule dynamics assays; tubulin modification Western blots; centrosome separation counting; proliferation assays |
Journal of cell science |
Medium |
22427689
|
| 2013 |
The C-terminal hydrophobic domain of TIG3 targets intact TIG3 to the plasma membrane but, when isolated independently, localizes to mitochondria. A segment within the N-terminal hydrophilic region (amino acids 1–135) is necessary and sufficient for centrosomal targeting, indicating dual localization signals for membrane vs. centrosome functions. |
GFP-fusion constructs of isolated domains; fluorescence microscopy in keratinocytes; subcellular fractionation |
The Journal of investigative dermatology |
Medium |
24401997
|
| 2014 |
TIG3 distributes to the cell membrane (where it activates TG1 for terminal differentiation) and to the centrosome (where it inhibits centrosome separation during mitosis and alters microtubule function), establishing two spatially distinct mechanisms for controlling keratinocyte proliferation and survival. |
Immunofluorescence localization; TG1 activity assay; centrosome separation assay; cell proliferation assay (review/synthesis of prior experimental work) |
The Journal of investigative dermatology |
Medium |
24599174
|
| 2014 |
RARRES3 phospholipase A1/A2 enzymatic activity contributes to tumor cell differentiation; loss of this activity promotes lung metastasis of breast cancer cells. RARRES3 downregulation also facilitates adhesion of tumor cells to the lung parenchyma. |
Loss-of-function (shRNA knockdown) and re-expression of wild-type vs. catalytically inactive RARRES3 mutants; in vitro adhesion assays; in vivo lung metastasis mouse models |
EMBO molecular medicine |
High |
24867881
|
| 2014 |
RARRES3 acts as an acyl protein thioesterase that binds Wnt proteins and LRP6, modulates their acylation status, and thereby suppresses Wnt/β-catenin signaling, epithelial-mesenchymal transition, and cancer stem cell properties. Mutation of conserved active-site residues abolishes this deacylation activity. p53 induces RARRES3 expression, linking p53 to Wnt pathway regulation through protein deacylation. |
Co-immunoprecipitation of RARRES3 with Wnt proteins and LRP6; active-site mutagenesis; acylation status assays; EMT and cancer stem cell phenotype assays; p53 modulation experiments in breast cancer cells |
Cell death and differentiation |
High |
25361079
|
| 2015 |
RARRES3 interacts with MTDH (metadherin/AEG-1) as determined by co-immunoprecipitation, and their interaction is inversely correlated; RARRES3 suppresses EMT and metastasis of colorectal cancer cells in vitro and in vivo through this suppression of MTDH. |
Co-immunoprecipitation; knockdown and re-expression in CRC cell lines; transwell/wound healing migration assays; tail-vein xenograft metastasis model |
American journal of cancer research |
Medium |
26269758
|
| 2015 |
The NMR solution structure of the TIG3 N-terminal domain (NTD) is similar in overall fold to H-REV107 NTD, but the CTD-binding regions on the NTD differ between TIG3 and H-REV107. The TIG3 NTD enhances cell death induced by the CTD, while the H-REV107 NTD is inhibitory; the flexible main loop of H-REV107, but not TIG3, is critical for this NTD-CTD modulatory function. |
NMR solution structure determination; cell death assays with domain constructs; domain-interaction studies in HeLa cells |
FEBS letters |
High |
25871522
|
| 2016 |
Overexpression of TIG3 in HCC Hep3B cells suppresses tumor growth in vitro and in vivo via inhibition of ERK1/2 signaling, promoting apoptosis and inhibiting proliferation and migration. |
TIG3 cDNA overexpression; Western blot for pERK1/2; apoptosis assays; nude mouse xenograft model |
Tumour biology |
Low |
26951515
|
| 2017 |
G9a histone methyltransferase epigenetically silences RARRES3 through H3K9 di-methylation at the RARRES3 locus, and this silencing is a key downstream mechanism by which G9a promotes HCC progression. Inactivation of G9a (RNAi, CRISPR, or pharmacological) restores RARRES3 expression and suppresses HCC cell proliferation and metastasis. |
ChIP assay (H3K9me2 at RARRES3 promoter); RNA-seq; G9a shRNA/CRISPR KO; pharmacological inhibition; in vivo nude mouse model |
Journal of hepatology |
High |
28532996
|
| 2017 |
RARRES3 knockdown increases transcript and protein levels of immunoproteasome subunits (but not constitutive proteasome subunits) in mammary epithelial and breast cancer cell lines, identifying RARRES3 as an endogenous inhibitor of immunoproteasome expression. RARRES3 expression is regulated by IRF1 and is sensitive to RORA depletion. |
RARRES3 siRNA knockdown; Western blot and RT-qPCR for immunoproteasome subunits; RORA depletion; IRF1 functional analysis |
Scientific reports |
Medium |
28051153
|
| 2019 |
PLAAT4 physically interacts with the ribosomal protein RPLP0, as identified by yeast two-hybrid screening and confirmed by co-immunoprecipitation and co-localization. PLAAT4 expression suppresses RPLP0 protein levels; cells expressing PLAAT4 or with RPLP0 silenced show similar patterns of decreased cell viability/proliferation, increased cell death, and reduced levels of cell-cycle-associated and anti-apoptotic proteins, indicating that RPLP0 downregulation mediates PLAAT4-induced cell cycle arrest and apoptosis. |
Yeast two-hybrid screening; co-immunoprecipitation; co-localization by fluorescence microscopy; RPLP0 siRNA knockdown; cell viability/death assays; Western blot for cell-cycle and apoptosis proteins |
Cell biochemistry and biophysics |
Medium |
31131438
|
| 2021 |
RARRES3 restricts Toxoplasma gondii infection in human cells by inducing premature egress of the parasite. RARRES3 is an IFNγ-stimulated gene whose individual expression is sufficient to restrict parasite growth across multiple human cell lines. |
Overexpression screen of 414 IFNγ-induced ISGs; T. gondii infection assays; parasite egress assays in multiple human cell lines |
eLife |
Medium |
34871166
|
| 2022 |
KDM2A (H3K36me2 demethylase) suppresses RARRES3 expression via demethylation of H3K36me2 at the RARRES3 promoter. RARRES3 knockdown attenuates the inhibitory effects of KDM2A depletion on bladder cancer cell malignant phenotypes, placing RARRES3 downstream of KDM2A in an epigenetic regulatory axis. |
ChIP for H3K36me2 at RARRES3 promoter; KDM2A knockdown; RARRES3 knockdown rescue epistasis; xenograft mouse model; KDM2A inhibitor + ATRA combination treatment |
Cell death & disease |
High |
35697678
|
| 2025 |
CRABP2 physically binds PLAAT4 and decreases its protein stability; inhibition of PLAAT4 reverses the suppression of NSCLC cell malignant phenotypes and lipid droplet formation caused by CRABP2 knockdown, defining a CRABP2/PLAAT4-mediated lipid metabolic axis in lung cancer progression. |
Co-immunoprecipitation of CRABP2 and PLAAT4; protein stability assay; PLAAT4 knockdown rescue experiment; lipid droplet quantification; xenograft mouse model |
Journal of Cancer |
Medium |
40657374
|
| 2025 |
A peptide derived from TIG3 binds near the Switch II domain of KRAS G12V with moderate affinity, induces conformational changes in KRAS G12V as determined by X-ray crystallography, and reduces viability of cancer cell lines harboring KRAS G12V mutation. |
X-ray crystallography of TIG3 peptide–KRAS G12V complex; binding affinity measurement; cell viability assay |
Biochimica et biophysica acta. Proteins and proteomics |
Medium |
40752582
|
| 2025 |
BCL6 transcriptionally represses PLAAT4 expression in high-grade serous ovarian cancer (HGSOC), and BCL6-mediated downregulation of PLAAT4 activates the PI3K/AKT signaling pathway to promote tumor cell proliferation, invasion, and migration in vitro and in vivo. |
CUT&Tag + RNA-seq to identify BCL6 target genes; PLAAT4 knockdown and overexpression; Western blot for PI3K/AKT and EMT markers; xenograft and abdominal metastasis mouse models |
Frontiers in pharmacology |
Medium |
40777995
|
| 2003 |
TIG3 mRNA induction by ATRA in head and neck and lung carcinoma cells is blocked by pan-RAR antagonist AGN193109 and RARα antagonist Ro 41-5253, demonstrating that TIG3 transcription is regulated through retinoid receptors (RAR-dependent). Induction of TIG3 by ATRA is associated with suppression of anchorage-independent colony formation. |
Pharmacological RAR antagonist treatment; RT-PCR; anchorage-independent colony formation assay in HNSCC and NSCLC cell lines |
Oncogene |
Medium |
12879006
|
| 2005 |
TIG3 expression in ovarian carcinoma cells is negatively regulated by an activated MEK-ERK signaling pathway; specific MEK inhibition restores TIG3 mRNA and is correlated with growth inhibition. In a subset of ovarian carcinoma cells, TIG3 suppression is MEK-ERK-independent but can be partially reversed by IFNγ, indicating multiple upstream regulatory mechanisms. |
MEK-ERK pathway inhibition with small-molecule MEK inhibitors; IFNγ treatment; RT-PCR; cell growth assay; in situ hybridization |
International journal of cancer |
Medium |
15856468
|