| 1995 |
DAP3 was identified as a positive mediator of interferon-gamma-induced cell death in HeLa cells. Antisense RNA-mediated inactivation of DAP3 protected cells from IFN-γ-induced cell death, and ectopic overexpression was incompatible with cell growth. The protein carries a potential P-loop (nucleotide-binding) motif. |
Antisense cDNA library functional selection screen; antisense RNA knockdown; ectopic overexpression with colony-formation assay |
The Journal of biological chemistry |
High |
7499268
|
| 1999 |
Structure-function analysis showed that the intact full-length DAP3 protein is required for apoptosis induction when overexpressed, while the N-terminal 230 amino acids act in a dominant-negative fashion. Both activities depend on the integrity of the nucleotide-binding (P-loop) motif. Antisense DAP3 and the dominant-negative form protected cells from Fas- and TNF-α-induced apoptosis, placing DAP3 downstream of the receptor signaling complex; its death-promoting effect is caspase-dependent. A C. elegans ortholog induced cell death in mammalian cells upon overexpression. |
Antisense RNA knockdown; truncation/dominant-negative mutant overexpression; P-loop mutagenesis; caspase inhibitor epistasis; cross-species functional complementation |
The EMBO journal |
High |
9889192
|
| 2000 |
DAP3 interacts with the glucocorticoid receptor (GR) ligand-binding domain in a ligand-dependent manner, identified by yeast two-hybrid and confirmed in vitro. The main interaction domain maps to the N-terminal region of DAP3. Co-transfection showed DAP3 stimulates ligand-induced GR transcriptional activation and increases steroid sensitivity. DAP3 also formed complexes with other nuclear receptors, bHLH/PAS proteins, and Hsp90. |
Yeast two-hybrid; in vitro binding assay; co-transfection transcriptional reporter assay; co-immunoprecipitation |
The Biochemical journal |
Medium |
10903152
|
| 2001 |
A conserved N-terminal sequence targets DAP3 to mitochondria. GFP fusion with the N-terminal region of human DAP3 localized exclusively to mitochondria in transfected human fibroblasts, confirmed by confocal microscopy. The mitochondrial targeting sequence is conserved in mouse, Drosophila, and C. elegans orthologs. |
N-terminal DAP3–EGFP fusion protein; confocal fluorescence microscopy in transfected human fibroblasts; in silico targeting prediction (MITOPROT, TargetP) with experimental validation |
Biochemical and biophysical research communications |
Medium |
11162496
|
| 2002 |
Co-expression of DAP3 and GR results in increased cellular GR protein levels and partial translocation of DAP3 to the nucleus. The full-length DAP3 (not just the N-terminal domain) is required to efficiently increase GR levels and enhance GR transcriptional activity, indicating interplay between N- and C-termini for DAP3 cellular function. |
Co-transfection; western blot; subcellular fractionation/immunofluorescence for DAP3 localization; transcriptional reporter assay |
Biochemical and biophysical research communications |
Medium |
12099703
|
| 2002 |
DAP3 remains intra-mitochondrial during TRAIL-induced apoptosis and does not interact with FADD when subcellular compartments are intact. Interaction between DAP3 and FADD was only detectable in whole-cell lysate co-immunoprecipitation (i.e., an in vitro artifact after compartment disruption). TRAIL-induced, DR4-mediated apoptosis in Jurkat cells was found to be independent of DAP3. |
Cell fractionation; immunoprecipitation with intact vs. disrupted compartments; TRAIL-induced apoptosis in Jurkat cells with DAP3 analysis |
Biochemical and biophysical research communications |
Medium |
12359235
|
| 2004 |
DAP3 is critical for anoikis induction. DAP3 knockdown (antisense oligonucleotides) inhibited anoikis, while overexpression augmented caspase activation upon cell detachment. Upon detachment, DAP3 associates with FADD and caspase-8 is activated. DAP3 is phosphorylated by Akt (PKB), and active Akt suppresses DAP3-induced apoptosis; mutation of the Akt phosphorylation consensus site in DAP3 renders it resistant to Akt suppression. Integrin ligation activates Akt, which phosphorylates DAP3 and suppresses anoikis. |
Antisense oligonucleotide knockdown; overexpression; co-immunoprecipitation (DAP3-FADD); caspase activation assay; Akt phosphorylation site mutagenesis; integrin ligation experiments |
The Journal of biological chemistry |
High |
15302871
|
| 2006 |
DAP3 is essential for embryonic viability in mice; dap3-/- embryos die at ~E9.5 with arrested development, shrunken mitochondria with swollen cristae (by TEM), and reduced cytochrome c oxidase-I (mitochondrial genome-encoded), consistent with a role in mitochondrial protein synthesis. siRNA knockdown reduced oxygen consumption in cultured cells. Cultured dap3-/- embryonic cells showed impaired apoptosis in response to extrinsic stimuli (TNFα, TRAIL, anti-Fas) but not intrinsic (mitochondrial) pathway stimuli. |
Knockout mouse generation; transmission electron microscopy; western blot for mtDNA-encoded protein (COX-I); siRNA knockdown + oxygen consumption measurement; cultured embryonic cell apoptosis assays with death receptor stimuli |
FASEB journal |
High |
17135360
|
| 2008 |
DAP3 (mitochondrial ribosomal small subunit protein MRPS29) is phosphorylated in situ at Ser215 or Thr216, Ser220, Ser251 or Ser252, and Ser280, mapped by tandem mass spectrometry. Protein kinase A and Protein kinase Cδ can phosphorylate recombinant DAP3 at these same residues in vitro. Phosphorylation sites cluster around the conserved GTP-binding motifs. Site-directed mutagenesis of selected phosphorylation sites affected cell proliferation and PARP cleavage (caspase activation). |
Tandem mass spectrometry of immunopurified mitochondrial ribosomal DAP3; in vitro kinase assay with PKA and PKCδ; site-directed mutagenesis; PARP cleavage assay |
Protein science |
High |
18227431
|
| 2008 |
hNOA1 (human homolog of AtNOA1, a large mitochondrial GTPase) physically interacts with DAP3 in mitochondria, identified by immunoprecipitation-mass spectrometry from enriched mitochondrial fractions. hNOA1 is peripherally associated with the inner mitochondrial membrane facing the matrix. Knockdown of hNOA1 renders cells more resistant to apoptotic stimuli (IFN-γ, staurosporine), consistent with a functional link through its DAP3 interaction. |
Immunoprecipitation-mass spectrometry from mitochondrial fractions; immunofluorescence; immunoelectron microscopy; mitochondrial subfractionation; siRNA knockdown + apoptosis assay |
The Journal of biological chemistry |
Medium |
19103604
|
| 2009 |
IPS-1 (interferon-beta promoter stimulator 1, also known as MAVS) binds DAP3 and is required for DAP3-mediated anoikis. Cell detachment induces IPS-1 expression, recruitment of caspase-8 to IPS-1, and caspase-8 activation. IPS-1 knockout mouse embryonic fibroblasts are resistant to anoikis. Knockdown of IPS-1 inhibits DAP3-mediated anoikis, placing IPS-1 downstream of or in concert with DAP3 in this pathway. |
Co-immunoprecipitation (IPS-1/DAP3 interaction); IPS-1 KO MEFs; siRNA knockdown of IPS-1; overexpression of IPS-1; caspase-3/-8/-9 activation assays; anoikis assay |
Cell death and differentiation |
High |
19644511
|
| 2010 |
Yeast two-hybrid screening identified DELE (death ligand signal enhancer) as a novel DAP3-binding protein. DELE interaction with DAP3 was confirmed in mammalian cells by co-immunoprecipitation. Stable DELE expression sensitized cells to TNF-α- and TRAIL-induced apoptosis; DELE knockdown rescued HeLa cells from apoptosis and significantly inhibited activation of caspase-3, -8, and -9 induced by TNF-α, anti-Fas, or TRAIL. |
Yeast two-hybrid screening; co-immunoprecipitation in mammalian cells; stable overexpression; siRNA knockdown; caspase activation assays |
Apoptosis |
Medium |
20563667
|
| 2020 |
DAP3 functions as a potent repressor of A-to-I RNA editing in cancer by directly interacting with the deaminase domain of ADAR2, disrupting ADAR2's association with its target transcripts. This suppression of editing leads to accumulation of unedited, more tumorigenic forms of target transcripts (e.g., PDZD7 without stop-codon recoding). |
Co-immunoprecipitation (DAP3-ADAR2 interaction); domain-mapping pulldown; RNA immunoprecipitation; editome sequencing; functional assays of PDZD7 recoding |
Science advances |
Medium |
32596459
|
| 2022 |
DAP3 functions as a splicing regulatory RNA-binding protein in cancer. It coordinates splicing regulatory networks by mediating formation of ribonucleoprotein complexes to induce substrate-specific splicing changes, and also modulates splicing of splicing factors themselves, causing indirect widespread alternative splicing effects. Non-productive splicing of WSB1 was demonstrated as a causal DAP3-modulated mis-splicing event in tumorigenesis. |
RNA-seq splicing analysis; RNA immunoprecipitation; ribonucleoprotein complex co-immunoprecipitation; TCGA pan-cancer splicing analysis; functional WSB1 splicing validation |
Nature communications |
Medium |
35379802
|
| 2024 |
DAP3 promotes mitochondrial complex I activity in HCC cells by regulating translation and expression of the mitochondrial genome-encoded MT-ND5. AKT-mediated phosphorylation of DAP3 at Ser185 is the key event mediating its mitochondrial localization and function in HCC cells. |
siRNA knockdown; overexpression; mitochondrial complex I activity assay; western blot for MT-ND5; Ser185 phosphorylation site mutagenesis; subcellular fractionation; in vitro and in vivo tumor models |
Cell death & disease |
Medium |
39080251
|
| 2024 |
Bi-allelic loss-of-function variants in DAP3 reduce MRPS29 (DAP3) protein levels, causing decreased assembly of the mitoribosomal small subunit and combined deficiency of oxidative phosphorylation complexes I and IV. Lentiviral rescue with wild-type DAP3 cDNA partially restored MRPS7, MRPS9, and complex I/IV subunit levels. In vitro assays showed DAP3 disease variants reduce GTPase activity, thermal stability, and both intrinsic and extrinsic apoptotic sensitivity. Protein modeling suggested variants impact ADP binding. |
Proteomic profiling of patient fibroblasts; respiratory chain activity measurement; lentiviral cDNA rescue; in vitro GTPase activity assay; thermal stability assay; apoptosis sensitivity assays; protein structural modeling |
American journal of human genetics |
High |
39701103
|
| 2024 |
DAP3 preserves m6A RNA methylation levels through two mechanisms: (1) it directly binds to m6A target regions on RNA, facilitating METTL3 binding to these sites; and (2) it promotes MAT2A last-intron splicing, increasing MAT2A protein, cellular SAM (methyl donor), and m6A levels. DAP3 silencing impairs tumorigenesis, which can be rescued by MAT2A overexpression. |
m6A sequencing; RNA immunoprecipitation; METTL3 ChIP/RIP; MAT2A splicing assay; SAM quantification; MAT2A overexpression rescue; tumor growth assays |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
39316047
|
| 2023 |
DAP3 knockdown attenuated radiation-induced G2/M cell cycle arrest in human lung adenocarcinoma cells and decreased expression of phosphorylated cdc2 (Tyr15) and phosphorylated CHK1 (Ser296). A CHK1 inhibitor phenocopied DAP3 loss in abrogating G2 arrest, placing DAP3 upstream of CHK1-mediated G2/M checkpoint regulation in the radiation response. |
siRNA knockdown of DAP3; flow cytometry cell cycle analysis after irradiation; western blot for phospho-cdc2, phospho-CHK1; CHK1 inhibitor epistasis; radiosensitivity assay |
Journal of radiation research |
Medium |
37023702
|