| 1996 |
DDX17 (p72) is a nuclear DEAD-box protein that exhibits ATPase activity in the presence of RNA; immunocytochemistry showed it co-localizes with p68 in the nucleus of HeLa cells, consistent with a nuclear function. |
Recombinant protein purification, ATPase assay, immunocytochemistry |
Nucleic acids research |
Medium |
8871553
|
| 2001 |
DDX17 (p72) possesses both RNA helicase (unwinding) and RNA annealing activities, and can catalyze ATP-dependent rearrangement of stable RNA secondary structures via branch migration intermediates, analogous to certain DNA helicases. |
In vitro biochemical assays with recombinant p72 protein; RNA unwinding and annealing assays |
Nucleic acids research |
High |
11353078
|
| 2001 |
The p72 mRNA contains a 5'-UTR with an upstream non-AUG codon that drives alternative translation to produce an 82 kDa isoform (p82) with RNA helicase activity nearly identical to p72; p82 is a naturally expressed protein in HeLa cells. |
5' UTR mapping, in vitro translation, immunological characterization, purification and helicase assay |
The Journal of biological chemistry |
High |
11675387
|
| 2002 |
DDX17 (p72) specifically promotes inclusion of CD44 alternative exons containing AC-rich exon enhancer elements; this requires both the helicase ATP-binding activity and the C-terminal region of p72. The related protein p68 does not share this splicing activity. p72 associates with pre-mRNA complexes in vitro. |
Transient transfection of minigenes, ATPase-site mutants, deletion mutants, in vitro splicing extracts, co-immunoprecipitation with pre-mRNA |
Molecular and cellular biology |
High |
12138182
|
| 2003 |
DDX17 (p72) and p68 interact with each other and self-associate; they preferentially exist as heterodimers in cells. p68 also interacts with NFAR-2. Gel filtration indicates p68/p72 exist in complexes of ~150–400 kDa, with a subset of p68 in very large complexes (>2 MDa). |
Yeast two-hybrid, co-immunoprecipitation, gel filtration chromatography |
Nucleic acids research |
Medium |
12595555
|
| 2004 |
DDX17 (p72) and p68 associate with histone deacetylase 1 (HDAC1) and repress transcription in a promoter-specific manner when targeted to constitutive promoters. |
Co-immunoprecipitation, reporter gene transcription repression assays |
BMC molecular biology |
Medium |
15298701
|
| 2006 |
DDX17 (p72) and p68 are MyoD-associated proteins that co-activate MyoD-dependent muscle gene expression; knockdown of p68/p72 impairs recruitment of TBP, RNA polymerase II, and Brg-1 (SWI/SNF ATPase subunit) to muscle gene promoters, and blocks chromatin remodeling and skeletal muscle differentiation. The noncoding RNA SRA also co-immunoprecipitates with MyoD. |
Co-immunoprecipitation, RNA interference, chromatin immunoprecipitation, differentiation assays |
Developmental cell |
High |
17011493
|
| 2007 |
DDX17 (p72) and p68 form complexes with beta-catenin and promote beta-catenin-dependent transcription of target genes (c-Myc, cyclin D1, c-jun, fra-1); simultaneous knockdown reduces beta-catenin target gene expression, enhances p21 expression, inhibits proliferation, and reduces tumor formation in vivo. |
Co-immunoprecipitation, siRNA knockdown, reporter gene assays, xenograft tumor assays |
Cancer research |
Medium |
17699760
|
| 2007 |
DDX17 (p72) RNA helicase forms complexes with the coactivators p300/CBP via its N-terminal 63 amino acids, and also binds P/CAF; these three proteins synergize to activate the Mdm2 promoter. Knockdown of p72 reduces Mdm2 transcription in a p53-dependent and -independent manner. |
Co-immunoprecipitation, in vitro binding assays, reporter gene assays, siRNA knockdown |
Journal of cellular biochemistry |
Medium |
17226766
|
| 2007 |
p68 negatively controls p72/p82 gene expression (but not vice versa). Co-silencing of both p68 and p72/p82 causes perturbation of nucleolar structure and cell death; the nucleolytic cleavage of 32S pre-rRNA is reduced, consistent with a role in structural rearrangement of the pre-60S ribosomal subunit. The redundant function maps to RNA rearrangement (not unwinding) activity. |
siRNA knockdown, mutant studies distinguishing rearrangement vs. unwinding activity, nucleolar morphology, pre-rRNA processing assays |
Nucleic acids research |
Medium |
17485482
|
| 2008 |
DDX17 (p72), but not the highly similar p68, is identified as a ZAP (zinc-finger antiviral protein)-interacting protein. ZAP binds via its N-terminal domain; both N- and C-terminal domains of p72 bind ZAP. p72 RNA helicase activity is required for promoting ZAP-mediated viral RNA degradation. Overexpression of the p72 C-terminal domain reduces ZAP activity; full-length p72 enhances it. Knockdown of p72 reduces ZAP activity but does not affect tristetraprolin-mediated RNA degradation. |
Co-immunoprecipitation, domain mapping, RNAi knockdown, viral RNA degradation assays, helicase-dead mutant |
Proceedings of the National Academy of Sciences of the United States of America |
High |
18334637
|
| 2009 |
siRNA-mediated knockdown of DDX17 (p72), but not p68, significantly inhibits oestrogen-dependent transcription of endogenous ERα-responsive genes and oestrogen-dependent proliferation of MCF-7 and ZR75-1 breast cancer cells, demonstrating a non-redundant role for p72 in ERα co-activation. |
siRNA knockdown, RT-PCR of endogenous ERα target genes, cell proliferation assays |
Oncogene |
Medium |
19718048
|
| 2010 |
DDX17 (p72) and p68 are sumoylated at a single, homologous consensus SUMO site; sumoylation significantly increases protein stability of both proteins. Preventing sumoylation of p72 increases its ability to transactivate estrogen receptor and p53, while sumoylation promotes interaction of p68/p72 with HDAC1 (but not HDAC2/3, p300, or estrogen receptor). p68 but not p72 is polyubiquitylated, and mutation of the sumoylation site increases p68 polyubiquitylation, suggesting SUMO competes with ubiquitin-mediated proteasomal degradation for p68. |
Sumoylation site mutagenesis, protein stability assays, co-immunoprecipitation, transcriptional reporter assays |
Biochemistry |
High |
19995069
|
| 2010 |
DDX17 (p72) and p68 are substrates for acetylation by the acetyltransferase p300 in vitro and in vivo. Mutation of acetylation sites affects binding to HDACs (but not to p300 or estrogen receptor). Acetylation increases protein stability and coactivation of estrogen receptor. Acetylation of p72 (but not p68) also enhances p53-dependent MDM2 promoter activation. Blocking p72 acetylation causes cell cycle arrest and apoptosis. |
In vitro acetylation assay, acetylation-site mutagenesis, co-immunoprecipitation, reporter gene assays, cell cycle/apoptosis analysis |
The Journal of biological chemistry |
High |
20663877
|
| 2012 |
DDX5 and DDX17 act as transcriptional coactivators of NFAT5 and are required for activating NFAT5 target genes involved in tumor cell migration. In parallel, DDX5/DDX17 promote inclusion of NFAT5 exon 5 (which contains a premature stop codon), coupling transcriptional activation to NMD-mediated reduction of NFAT5 protein levels — a dual regulatory role. |
Co-immunoprecipitation, reporter gene assays, siRNA knockdown, alternative splicing assays, migration assays |
Oncogene |
Medium |
22266867
|
| 2013 |
p68 (Ddx5) binds Upf3 protein of the NMD machinery; this interaction interferes with EJC binding. Ddx5 activates NMD of Ddx17/p72 mRNA (and Smg5 mRNA) in an ATP-binding-dependent manner requiring the 3'-UTR of target mRNAs, thereby establishing a regulatory loop controlling p72 expression levels. |
Co-immunoprecipitation, NMD reporter assays, ATPase mutant studies, 3'-UTR deletion analysis |
Nucleic acids research |
Medium |
23788676
|
| 2013 |
DDX17 promotes production of infectious HIV-1 particles; its helicase activity is required. A DQAD helicase-dead mutant reduces packaging of viral genomic RNA and diminishes HIV-1 Gag-Pol frameshift, demonstrating that DDX17 modulates HIV-1 RNA metabolism to support infectious particle production. |
Overexpression of helicase-dead mutant (DQAD), viral RNA packaging assay, frameshifting assay |
Virology |
Medium |
23769241
|
| 2014 |
DDX17 cooperates with hnRNP H/F splicing factors to define epithelial- and myoblast-specific splicing subprograms. Downregulation of DDX5/DDX17 protein during myogenesis and EMT is mediated by differentiation-induced miRNAs whose biogenesis itself depends on DDX5/DDX17. DDX5/DDX17 also function as coregulators of master transcriptional regulators of differentiation. |
siRNA knockdown, RNA-seq, CLIP-seq, miRNA profiling, alternative splicing assays |
Cell reports |
High |
24910439
|
| 2014 |
DDX17 binds the stem loops of host pri-miRNA to facilitate their processing by Drosha (nuclear function), and also directly binds a specific stem loop in bunyaviral (RVFV) RNA to restrict infection (cytoplasmic function). Loss of DDX17 (but not the related DDX5) specifically increases RVFV replication. This dual stem-loop recognition underlies both roles. |
RNAi screening, CLIP-seq, genetic depletion in Drosophila and human cells, viral replication assays |
Cell |
High |
25126784
|
| 2015 |
DDX17 (p72) physically interacts with Sox2 via co-immunoprecipitation, and this interaction is preferentially restricted to Sox2-reporter-responsive (stem-like) breast cancer cells where DDX17 is nuclear. DDX17 knockdown reduces Sox2-SRR2 promoter binding and Sox2-dependent target gene expression (MUC15, CCND1, CD133), as well as colony and mammosphere formation in stem-like cells. |
LC-MS (initial identification), co-immunoprecipitation, siRNA knockdown, ChIP-PCR, reporter assays, colony/mammosphere assays |
Cellular signalling |
Medium |
26569340
|
| 2017 |
DDX17 promotes gefitinib resistance in NSCLC cells by dissociating the E-cadherin/β-catenin complex, causing β-catenin nuclear translocation and transcription of β-catenin target genes. DDX17 undergoes nucleocytoplasmic shuttling via nuclear localization signals (NLS) and nuclear export signals (NES) through an exportin/importin-dependent pathway; disrupting this shuttling impairs β-catenin activation and acquired resistance. |
Co-immunoprecipitation, NLS/NES sequence identification, nuclear/cytoplasmic fractionation, β-catenin reporter assays, drug resistance assays |
Cancer letters |
Medium |
28259822
|
| 2018 |
DDX17 controls REST-dependent transcriptional repression of neuronal genes by associating with REST and promoting its binding to a subset of REST-target gene promoters. During neuronal differentiation, DDX17 downregulation contributes to REST complex release and neuronal gene activation. DDX17 and DDX5 also regulate processing of proneural miRNAs (including miR-26a/b) that target the REST complex; an intronic regulatory region negatively impacts miR-26a2 processing and splicing in a DDX17-dependent manner. |
Co-immunoprecipitation, ChIP, siRNA knockdown, miRNA processing assays, luciferase reporter assays |
Nucleic acids research |
Medium |
29931089
|
| 2018 |
DDX17 controls HIV-1 splicing specifically at the A4/A5 splice acceptor cluster (but not A1), independently of DDX5. In the absence of DDX17, viral envelope protein production and other accessory proteins are severely reduced. DDX17 interacts with splicing factors SRSF1/SF2 and U2AF65/35. Specific RNA-binding motifs (not the Walker A, Walker B/DEAD, Q motif, or glycine doublet) are essential for this splicing function. |
siRNA knockdown, splicing assays, motif-deletion mutagenesis, co-immunoprecipitation with splicing factors |
Journal of molecular biology |
High |
30131116
|
| 2019 |
Under hypoxia, the E3 ubiquitin ligase HectH9 mediates K63-linked polyubiquitination of DDX17. Polyubiquitinated DDX17 dissociates from the Drosha-DGCR8 complex (reducing biogenesis of anti-stemness miRNAs) and associates with p300-YAP, leading to H3K56 acetylation at stemness-related gene promoters and their transcriptional activation, promoting cancer stem-like properties. |
Ubiquitination assays (K63-linkage specific), Co-IP, Drosha complex pulldown, ChIP (H3K56ac), miRNA profiling, tumor-initiating capacity assays |
Cancer research |
High |
30877109
|
| 2019 |
Crystal structures of the DDX17 core catalytic domain revealed sequence-specific RNA recognition; the catalytic core binds and remodels a specific region of primary miRNA 3' to the mature sequence, enhancing Drosha processing. An intramolecular interaction between the DDX17 N-terminal tail and the DEAD domain acts as an autoregulatory mechanism controlling ATPase activity. |
X-ray crystallography, biochemical RNA-binding and ATPase assays, pri-miRNA processing assays |
Cell reports |
High |
31851931
|
| 2019 |
DDX17 physically interacts with Klf4 (demonstrated by co-IP and GST pull-down); DDX17 inhibits Klf4 transcriptional activity at target gene promoters (E-cadherin, MMP2) and prevents Klf4 from binding the MMP2 promoter. The interaction requires the zinc-finger domain of Klf4. |
Co-immunoprecipitation, GST pull-down, luciferase reporter assay, ChIP (Klf4 promoter binding), Klf4 domain deletion |
Cell death & disease |
Medium |
31653828
|
| 2020 |
DDX17 directly binds RVFV non-coding RNAs (intergenic region, IGR, and 5' NCR) with Kd values of 5.77 µM and 9.85 µM respectively (measured by microscale thermophoresis), and the helicase domain (DDX17135-555) can unwind both RNAs in vitro. |
Microscale thermophoresis, SAXS, analytical ultracentrifugation, helicase unwinding assay |
International journal of molecular sciences |
High |
33374561
|
| 2021 |
DDX17 is identified as the sensor of endogenous SINE RNAs (retrotransposon RNAs) that activates the NLRC4 inflammasome independently of NAIPs. DDX17 licenses assembly of an inflammasome comprising NLRC4, NLRP3, and ASC, driving caspase-1 activation and cytokine (IL-18) release. Inhibiting DDX17-mediated NLRC4 activation reduced IL-18 in SLE patient PBMCs and prevented retinal degeneration in an AMD animal model. |
siRNA knockdown, co-immunoprecipitation, caspase-1 activation assay, cytokine release assay, in vivo retinal degeneration model |
Science immunology |
High |
34860583
|
| 2021 |
DDX17 inhibits HBV replication primarily by blocking cytoplasmic encapsidation of pregenomic RNA (pgRNA). DDX17 competes with HBV polymerase to bind the 5' epsilon stem-loop of pgRNA. Immunofluorescence showed DDX17 translocates from nucleus to cytoplasm in the presence of HBV RNA. This antiviral function is helicase-activity dependent. |
RNA immunoprecipitation, EMSA (electrophoretic mobility shift assay), immunofluorescence, encapsidation assay, helicase-dead mutant |
Journal of virology |
High |
34287051
|
| 2021 |
Mutant FUS recruits nuclear DDX17 into cytoplasmic stress granules and physically interacts with DDX17 through the RGG1 domain of FUS. Ectopic expression of DDX17 reduces cytoplasmic mislocalization of mutant FUS and suppresses FUS-mediated neurodegeneration in vivo. DDX17 functions as a regulator of the DNA damage response and its upregulation repairs defective DDR caused by mutant FUS. |
Co-immunoprecipitation (RGG1 domain), immunofluorescence (stress granule localization), overexpression rescue in vivo (Drosophila), DNA damage assays |
Acta neuropathologica |
Medium |
34061233
|
| 2021 |
DDX17 regulates alternative splicing of PXN-AS1 by inducing intron 3 retention, producing transcript PXN-AS1-IR3 that recruits TEX10 and p300 to the MYC enhancer to activate MYC transcription and downstream metastasis-associated genes. DDX17 knockout in a mouse model inhibits HCC metastasis. |
RNA-seq, splicing assays, Co-IP (TEX10/p300 complex), ChIP (MYC enhancer), DDX17 knockout mouse model |
Hepatology (Baltimore, Md.) |
Medium |
34626132
|
| 2022 |
DDX17 helicase unwinds R-loops in vitro and promotes MUS81-dependent restart of R-loop-stalled replication forks in human cells. Loss of DDX17 causes R-loop accumulation, anaphase bridges, and micronuclei. DDX17 associates with R-loops and facilitates their formation (specifically at loci with low pre-existing hybrid levels) to allow propagation of DSB ubiquitin cascade responses. |
In vitro R-loop unwinding assay, S9.6 immunofluorescence (R-loop detection), genome-wide R-loop mapping (DRIP-seq), DNA fiber assay (fork restart), helicase mutant |
Nucleic acids research |
High |
36453994
|
| 2022 |
DDX17 is required for efficient DSB repair; it is recruited early in the DSB ubiquitin cascade and promotes formation of DNA:RNA hybrids (R-loops) at DSB sites specifically at loci with low pre-existing hybrids. Loss of DDX17 impairs cell survival and DNA repair in response to DSB-inducing agents. |
Proteomic meta-analysis, siRNA knockdown, γH2AX foci assay, R-loop mapping (DRIP), DSB repair factor recruitment assays |
Nucleic acids research |
Medium |
36200807
|
| 2022 |
DDX17 acts as a transcriptional regulator that interacts with Y-box binding protein 1 (YB1) in the nucleus, driving YB1 binding to the EGFR promoter to activate EGFR transcription and downstream MEK/pERK signaling. MTDH stabilizes DDX17 by inhibiting its ubiquitination. |
Co-immunoprecipitation, ChIP-seq, promoter reporter assay, ubiquitination assay, in vitro and in vivo functional studies |
Oncogene |
Medium |
36385375
|
| 2022 |
THOC5 interacts with DDX17 (and DDX5) specifically in slow RNA polymerase II cells; this chromatin-associated complex also includes CDK12 and THOC6, and is involved in regulating R-loop structures and transcription elongation rate. |
Co-immunoprecipitation, THOC5 depletion, transcription elongation measurement, R-loop analysis |
iScience |
Medium |
36590164
|
| 2022 |
JICD1 (JAG1 intracellular domain) forms a transcriptional complex with DDX17, SMAD3, and TGIF2 to drive SOX2 expression and cancer stem-like transformation of astrocytes. ChIP-seq confirmed complex binding at the SOX2 locus. |
Proteomics, co-immunoprecipitation, ChIP-seq, reporter assays, functional transformation assays |
Cell reports |
Medium |
36417870
|
| 2024 |
DDX17 binds the transcriptional repressor BCL6 and inhibits expression of DRP1 (a mitochondrial fission protein). When DDX17 is reduced (as in heart failure), BCL6 repression is attenuated, DRP1 expression increases, mitochondrial fission is enhanced, and autophagy flux is blocked, leading to cardiomyocyte apoptosis and progressive cardiac dysfunction. Cardiomyocyte-specific Ddx17 knockout mice develop heart failure, while DDX17 restoration protects cardiac function. |
Co-immunoprecipitation (DDX17-BCL6), cardiomyocyte-specific KO and transgenic mice, mitochondrial morphology assays, autophagic flux assays, DRP1 expression analysis |
Signal transduction and targeted therapy |
High |
38782919
|