Affinage

ARNT

Aryl hydrocarbon receptor nuclear translocator · UniProt P27540

Length
789 aa
Mass
86.6 kDa
Annotated
2026-06-09
100 papers in source corpus 32 papers cited in narrative 31 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 7/7 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

ARNT (HIF-1β) is a constitutively nuclear bHLH-PAS transcription factor that serves as the obligate, broadly-promiscuous dimerization partner integrating xenobiotic, hypoxic, metabolic, and developmental transcriptional programs (PMID:1317062, PMID:7592839). It was first defined as the structural subunit required for DNA binding by the ligand-activated AH receptor: ARNT itself has no affinity for dioxin response elements, but ligand-induced, hsp90-dissociated AHR heterodimerizes with ARNT via the bHLH motif to form an XRE-binding complex, making this the first example of signal-controlled bHLH dimerization (PMID:1317062, PMID:8384309). Domain dissection established that both bHLH helices drive dimerization while the basic region confers XRE binding, and that the PAS-A and PAS-B segments mediate partner contacts (PMID:8065341); the PAS-B domain functions as both a protein-interaction surface and a ligand-accessible pocket, recruiting coactivators such as TACC3 (PMID:23240775). Crystal structures of AHR-ARNT, HIF-α-ARNT, NPAS1/3-ARNT, and NPAS4-ARNT/ARNT2 complexes on DNA reveal a shared multi-domain architecture built around intimate PAS-B:PAS-B associations, with ligand binding driving AHR's transition from chaperone engagement to ARNT heterodimer stabilization (PMID:27782878, PMID:39900897, PMID:36343253). Beyond AHR, ARNT is essential for hypoxic and glucose-deprivation gene induction, dimerizing with HIF-1α/HIF-2α in the nucleus to drive angiogenic and metabolic targets; its loss is embryonic-lethal with defective vascularization (PMID:9121557, PMID:9398442, PMID:10085255). Tissue-specific deletions place ARNT at the center of metabolic control—regulating adipocyte glucose uptake via Glut1/Glut4 (PMID:21982709), repressing PPARα-driven cardiac lipid metabolism through a HIF-2α-containing complex bound to the Ppara promoter (PMID:25329697), and governing keratinocyte differentiation by controlling HDAC1/2/3 and EGFR signaling (PMID:22505606). ARNT also forms transcriptionally active homodimers that bind the E-box CACGTG and can compete with c-Myc/Max (PMID:7892203, PMID:10454619), and its abundance is itself regulated—positively by NF-κB (PMID:21298084) and HIF-1α feed-forward signaling (PMID:27362802), and negatively by an FKBP12/YY1 repressor complex whose disruption activates homodimeric ARNT-driven ALK3/BMP signaling (PMID:29664738).

Mechanistic history

Synthesis pass · year-by-year structured walk · 23 steps
  1. 1992 High

    Established that ARNT is the obligate nuclear partner required for the AH receptor to bind DNA, defining the molecular basis of dioxin-responsive transcription.

    Evidence Co-immunoprecipitation of ARNT·AHR from nuclei of TCDD-treated cells with DNA-binding assays

    PMID:1317062

    Open questions at the time
    • Did not resolve which domains mediate dimerization
    • Did not define ARNT partners beyond AHR
  2. 1993 High

    Showed that ARNT-AHR dimerization is ligand-controlled and bHLH-mediated, with the hsp90-bound ligand-free receptor unable to dimerize—revealing signal-dependent assembly.

    Evidence In vitro DNA-binding reconstitution with cytosolic fractions, co-IP, and bHLH mutagenesis

    PMID:8384309

    Open questions at the time
    • Structural basis of the ligand-driven conformational switch not resolved
    • Role of PAS domains in dimerization not yet mapped
  3. 1994 High

    Mapped ARNT functional domains, separating dimerization (bHLH helices), DNA binding (basic region), and partner contacts (PAS), establishing the modular logic of the protein.

    Evidence Deletion mutagenesis with in vitro binding and complementation of ARNT-null c4 cells

    PMID:8065341

    Open questions at the time
    • Additional PAS biological functions described as 'unknown'
    • No structural model of domain interfaces
  4. 1995 High

    Demonstrated ARNT acts beyond AHR—forming E-box-binding homodimers and partnering with SIM/PER—and that distinct dimers have distinct DNA specificities, revealing broad partner promiscuity.

    Evidence Co-IP, gel-shift, SELEX site-selection, and reporter assays across multiple dimer pairs

    PMID:7592839 PMID:7892203

    Open questions at the time
    • Biological context of ARNT homodimer activity not defined
    • Physiological relevance of each dimer in vivo unaddressed
  5. 1996 High

    Established that the AHR·ARNT heterodimer synergizes with Sp1 through direct bHLH/PAS contacts, showing ARNT operates within larger combinatorial transcriptional assemblies.

    Evidence Reconstituted in vitro transcription with purified proteins, co-IP, DNase I footprinting, SL2 cell assays

    PMID:8647831

    Open questions at the time
    • Generality of Sp1 cooperation across other ARNT targets unknown
  6. 1997 High

    Genetic ablation revealed ARNT is essential for hypoxic/glucose-deprivation gene induction and embryonic angiogenesis, placing it upstream of VEGF-driven vascularization.

    Evidence Targeted Arnt disruption in ES cells and embryos with hypoxia assays and phenotyping

    PMID:9121557 PMID:9398442

    Open questions at the time
    • Did not distinguish HIF-1α vs HIF-2α contributions
    • Cell-autonomous site of requirement not yet localized
  7. 1999 High

    Defined the nuclear logic of HIF-1 assembly: HIF-1α translocates independently of ARNT, but nuclear heterodimerization is needed for stable retention of both subunits.

    Evidence Immunofluorescence in ARNT-mutant cells and nuclear vs cytosolic fraction co-IP

    PMID:10085255

    Open questions at the time
    • Mechanism of mutual stabilization not defined
    • Chromatin-binding step not directly visualized
  8. 1999 Medium

    Characterized ARNT homodimer DNA recognition (RTCACGTGAY) and its ability to compete with c-Myc/Max, suggesting cross-talk with the Myc network.

    Evidence PCR site-selection, gel-shift competition, transient reporter assays

    PMID:10454619

    Open questions at the time
    • Endogenous ARNT homodimer targets not identified
    • Single-lab finding
  9. 2004 High

    Revealed that AHR·ARNT can act as a coactivator on a non-canonical CYP1A2 enhancer without direct DNA binding, expanding the modes by which the dimer regulates transcription; genetic rescue with hypomorphic alleles plus dioxin confirmed a temporal window for AHR-ARNT-dependent hepatic vascular development.

    Evidence Reporter and gel-shift assays in mutant Hepa-1 cells; timed gestational dioxin rescue of ductus venosus defect in hypomorphic mice

    PMID:15144902 PMID:15545609

    Open questions at the time
    • Identity of the bridging enhancer-binding factor not fully defined
    • Direct ARNT targets in vascular development unmapped
  10. 2005 High

    Showed ARNT and AHR directly bind ERα, mediating estradiol-dependent transrepression of dioxin-inducible genes via simultaneous enhancer occupancy.

    Evidence GST pull-down, ChIP and sequential two-step ChIP at the Cyp1a1 enhancer

    PMID:15837795

    Open questions at the time
    • Mechanism of transrepression downstream of co-occupancy not resolved
  11. 2006 High

    Conditional and isoform-comparison studies localized ARNT's essential vascular role to endothelial cells and showed Arnt, but not Arnt2, supports AHR signaling—mapped to a single PAS-B residue.

    Evidence Endothelial-specific Cre-loxP knockout with metabolic/MRI phenotyping; chimeric and single-residue mutagenesis in Arnt-null Hepa1-c4 cells

    PMID:16941684 PMID:17023418

    Open questions at the time
    • Structural explanation for the His/Pro PAS-B determinant not provided
    • Liver vs other endothelial beds not fully compared
  12. 2008 Medium

    Identified a nutrient/Ca2+-presenilin signaling input that regulates ARNT levels in beta-cells, introducing upstream control of ARNT abundance.

    Evidence Ca2+-channel pharmacology, presenilin-1 overexpression, western/RT-PCR in MIN6 cells and human islets

    PMID:18174159

    Open questions at the time
    • Direct transcriptional mechanism not dissected
    • Single-lab pharmacological approach
  13. 2011 High

    Established transcriptional regulation of ARNT itself: NF-κB drives ARNT expression in an evolutionarily conserved manner, indirectly tuning HIF-2α levels.

    Evidence siRNA, overexpression, luciferase reporters, and Drosophila genetics (tango/sima)

    PMID:21298084

    Open questions at the time
    • Direct NF-κB binding sites in the ARNT locus not fully mapped
  14. 2011 High

    Defined ARNT as a regulator of adipose glucose handling and mitochondrial function, linking ARNT loss to leanness and protection from glucose intolerance.

    Evidence Adipose-specific knockout and 3T3-L1 shRNA with glucose-uptake and gene-expression assays

    PMID:21982709

    Open questions at the time
    • Which ARNT dimer (HIF vs other) drives the metabolic effect not isolated
  15. 2012 High

    Revealed ARNT controls epidermal differentiation via post-transcriptional regulation of HDAC1-3 and AREG/EGFR/ERK signaling, and identified the PAS-B domain as a druggable ligand/coactivator interface recruiting TACC3.

    Evidence Bidirectional knockdown/overexpression with TSA rescue in keratinocyte 2D/3D models; NMR screening and small-molecule (KG-548) disruption of ARNT PAS-B

    PMID:22505606 PMID:23240775

    Open questions at the time
    • Mechanism by which ARNT controls HDAC protein stability unresolved
    • Endogenous physiological PAS-B ligand not identified
  16. 2013 High

    Placed ARNT in an ARNT-STAT3 axis required for an intestinal T cell fate, demonstrating immune-developmental functions paralleling AHR.

    Evidence T cell-specific conditional knockout with STAT3 overexpression rescue and flow cytometry

    PMID:23836150

    Open questions at the time
    • Whether ARNT transcriptionally controls STAT3 directly not established
  17. 2014 High

    Demonstrated ARNT directly represses cardiac PPARα-driven lipid metabolism via a HIF-2α-containing complex bound to the Ppara promoter, with double knockout rescuing cardiac function.

    Evidence Cardiac conditional and Arnt/Ppara double knockout, ex vivo FA oxidation, ChIP at the Ppara promoter

    PMID:25329697

    Open questions at the time
    • Mechanism of repression at the Ppara promoter (corepressor recruitment) not detailed
  18. 2015 High

    Showed ARNT abundance and dimer assembly are gated by phosphorylation of its partner and that ARNT loss reprograms cancer-cell motility, linking ARNT to invasion phenotypes.

    Evidence CK1δ phosphorylation of HIF-1α with PLA/FRAP visualization of complex formation; ARNT knockdown/rescue with fibronectin/integrinβ1/FAK readouts and xenograft/metastasis models

    PMID:25744540 PMID:25839165

    Open questions at the time
    • Opposing effects of ARNT loss on growth vs metastatic colonization mechanistically unreconciled
    • Colorectal motility study from a single lab (Medium)
  19. 2016 High

    High-resolution crystallography defined the conserved multi-domain bHLH-PAS architecture with PAS-B:PAS-B associations and multiple ligand-accessible pockets, and a feed-forward loop showed ARNT can be HIF-limiting in tumors.

    Evidence X-ray structures of NPAS1/3-ARNT-DNA with comparison to HIF/CLOCK complexes; siRNA/overexpression HIF-reporter assays in Hep3B

    PMID:27362802 PMID:27782878

    Open questions at the time
    • Endogenous ligands occupying the structural pockets not identified
    • Feed-forward loop mechanism (Medium) not fully dissected
  20. 2018 High

    Identified the FKBP12/YY1 complex as a transcriptional repressor of ARNT and showed pharmacological derepression activates homodimeric ARNT-driven ALK3/BMP signaling, attenuating multi-organ fibrosis.

    Evidence Morpholino knockdown of FKBP12/YY1, FK506/GPI-1046 treatment, reporter/ChIP and injury models

    PMID:29664738

    Open questions at the time
    • Direct YY1/FKBP12 binding architecture at the ARNT locus not mapped
  21. 2021 Medium

    Linked ARNT deficiency to a PDK1/NQO1→ROS metabolic axis driving melanoma migration and extravasation, expanding ARNT's role in redox-coupled metastasis.

    Evidence siRNA, ROS scavenger/OXPHOS inhibitor rescue, migration/invasion and extravasation models

    PMID:33446631

    Open questions at the time
    • Direct transcriptional control of PDK1/NQO1 by ARNT not shown
    • Single-lab study
  22. 2022 High

    Resolved isoform- and partner-specific control: CK2 phosphorylation of ARNT isoform 1 tunes AHR output amplitude and direction, and NPAS4-ARNT/ARNT2 structures revealed variable PAS-A interface configurations distinct from other dimers.

    Evidence Isoform-specific suppression, CK2 inhibition, AHR translocation assays and transcriptomics; X-ray structures of NPAS4 heterodimers with biochemical/reporter validation

    PMID:35290121 PMID:36343253

    Open questions at the time
    • How the isoform 1:3 ratio is physiologically set is unknown
    • Functional consequence of NPAS4-ARNT PAS-A variability not tested in vivo
  23. 2025 High

    Provided the structural mechanism of ligand-dependent AHR-ARNT assembly, showing ligand-driven AHR transition from chaperone engagement to ARNT-stabilized heterodimer across six distinct ligands.

    Evidence X-ray crystallography of AHR-ARNT-DNA complexes with six different ligands

    PMID:39900897

    Open questions at the time
    • Dynamics of the chaperone-to-dimer transition in cells not directly captured
    • Whether ARNT's own PAS-B pocket is occupied by an endogenous ligand unresolved

Open questions

Synthesis pass · forward-looking unresolved questions
  • The identity of any endogenous ligand occupying ARNT's PAS-B pocket and the in vivo determinants that select among its many partners and homodimer remain unresolved.
  • No endogenous ARNT PAS-B ligand identified
  • Rules governing partner selection among AHR/HIF/NPAS factors and homodimer in a given cell unknown
  • Genome-wide endogenous ARNT homodimer target set undefined

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0003677 DNA binding 5 GO:0140110 transcription regulator activity 5
Localization
GO:0005634 nucleus 3 GO:0005829 cytosol 2
Pathway
R-HSA-1266738 Developmental Biology 4 R-HSA-74160 Gene expression (Transcription) 4 R-HSA-1430728 Metabolism 3 R-HSA-162582 Signal Transduction 2 R-HSA-8953897 Cellular responses to stimuli 2
Partners
AHREPAS1ESR1HIF1ANPAS1NPAS3NPAS4TACC3
Complex memberships
AHR·ARNT (XRE-binding) heterodimerARNT homodimer (E-box CACGTG)FKBP12/YY1 ARNT repressor complexHIF-1·ARNT / HIF-2·ARNT (HRE-binding) heterodimer

Evidence

Reading pass · 31 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
1992 ARNT is a structural component of the xenobiotic responsive element (XRE)-binding form of the AH receptor. ARNT and the ligand-binding subunit of the AHR were extracted as a complex from nuclei of TCDD-treated cells, establishing that ARNT is the obligate heterodimerization partner for DNA binding by the AHR. Co-immunoprecipitation from nuclear extracts, DNA-binding assays Science High 1317062
1993 Ligand-activated (but not ligand-free) AHR physically interacts with ARNT via the bHLH motif; ARNT alone has no affinity for dioxin response elements but strongly promotes DNA binding of the ligand-activated receptor. ARNT dimerization is thus signal-controlled, representing the first example of ligand-dependent bHLH factor dimerization. The ligand-free, hsp90-associated AHR fails to heterodimerize with ARNT. In vitro reconstitution of DNA binding with cytosolic fractions, co-immunoprecipitation, mutational analysis of bHLH motif Molecular and Cellular Biology High 8384309
1994 Deletion analysis of mouse ARNT defined functional domains: both alpha-helices of the bHLH region are required for dimerization; the basic region is required for XRE binding but not dimerization; PAS-A and PAS-B segments contribute to heterodimerization and additional unknown biological functions. A minimal construct containing only bHLH and PAS regions supports TCDD-dependent dimerization and XRE binding. Deletion mutagenesis, in vitro dimerization assays, XRE binding assays, complementation of ARNT-deficient cell line (c4) Molecular and Cellular Biology High 8065341
1995 ARNT forms a homodimer that binds the E-box sequence CACGTG (present in the adenovirus major late promoter), demonstrating a DNA-binding and transcriptional regulatory role independent of AHR. ARNT also forms heterodimers with Drosophila SIM and PER via combined PAS and HLH domains in a cooperative manner. Co-immunoprecipitation, gel-shift assays, cotransfection reporter assay (CAT) in CV-1 cells Proceedings of the National Academy of Sciences High 7892203
1995 Oligonucleotide selection-amplification established unique DNA-binding specificities for AHR·ARNT, ARNT·ARNT, and ARNT·SIM heterodimers. ARNT homodimer prefers the palindromic E-box CACGTG; AHR·ARNT prefers TNGCGTG. Coprecipitation showed ARNT has broad partner specificity among bHLH-PAS proteins whereas AHR, SIM are more restricted. Oligonucleotide selection-amplification (SELEX), coprecipitation, gel-shift assays Journal of Biological Chemistry High 7592839
1996 AHR·ARNT heterodimer and Sp1 synergistically activate CYP1A1 transcription. Both AHR and ARNT interact physically with the zinc finger domain of Sp1 via their bHLH/PAS domains, and DNA binding of either complex facilitates binding of the other to its cognate element. Co-immunoprecipitation, DNase I footprinting, in vitro transcription with baculovirus-expressed proteins, cotransfection in Drosophila SL2 cells (Sp1-free) Journal of Biological Chemistry High 8647831
1997 ARNT is essential for activation of hypoxia-responsive genes and glucose-deprivation response: ARNT-deficient ES cells fail to induce hypoxia-target genes. Arnt-/- embryos die by E10.5 with defective yolk-sac and branchial-arch angiogenesis, phenocopying VEGF or tissue factor knockouts, placing ARNT upstream of VEGF-driven vascularization. Targeted gene disruption (homologous recombination), ES cell hypoxia/glucose deprivation assays, embryonic phenotype analysis Nature High 9121557 9398442
1999 HIF-1α nuclear accumulation under hypoxia is independent of ARNT (as shown in ARNT-mutant hepatoma and ES cells), establishing that nuclear translocation is intrinsic to HIF-1α. However, co-immunoprecipitation from nuclear—but not cytosolic—fractions shows HIF-1α/ARNT complex forms in the nucleus, and heterodimerization is required for stable nuclear retention of both subunits. Immunofluorescence in ARNT-mutant cells, co-immunoprecipitation from nuclear vs. cytosolic fractions Journal of Cell Science High 10085255
1999 ARNT homodimer DNA binding is symmetric with a consensus sequence RTCACGTGAY; flanking nucleotides regulate binding affinity and ability to displace c-Myc/Max from CACGTG sequences. Despite differing binding affinities, ARNT homodimer and c-Myc/Max show similar transcriptional activation through each other's consensus sequences in CV-1 cells. PCR-based high-affinity site selection, gel-shift competition assays, transient transfection reporter assays Nucleic Acids Research Medium 10454619
2004 A novel CYP1A2 enhancer mechanism: the AHR-ARNT heterodimer functions as a coactivator (rather than direct DNA binder) by interacting with a factor that binds an enhancer lacking the canonical XRE core sequence. AHR-ARNT heterodimer expressed in bacteria cannot bind this enhancer directly, but interacts with the enhancer-binding factor; a dominant-negative AHR still activates the enhancer. Reporter assays in Hepa-1 mutant cell lines, gel-shift assays, bacterial expression of AHR-ARNT, mutational analysis Biochemical and Biophysical Research Communications Medium 15144902
2004 Gestational dioxin exposure can rescue the patent ductus venosus defect in AHR and ARNT hypomorphic mice as late as E18.5, establishing that AHR-ARNT heterodimerization and receptor activation are both required for normal hepatic vascular development and that the temporal window of receptor activity governs this process. Hypomorphic allele generation, timed gestational dioxin exposure, phenotypic rescue analysis Proceedings of the National Academy of Sciences High 15545609
2005 ARNT (HIF-1β) directly participates in estradiol-dependent transrepression of dioxin-inducible genes: both AHR and ARNT interact directly with ERα by GST pull-down; ChIP shows ERα is recruited to the Cyp1a1 enhancer only upon co-treatment with E2 and TCDD; sequential ChIP confirms AHR and ERα occupy the same enhancer simultaneously during transrepression. GST pull-down, chromatin immunoprecipitation (ChIP), sequential two-step ChIP, RT-qPCR Journal of Biological Chemistry High 15837795
2006 Endothelial-specific deletion of Arnt causes impaired hepatic vasculature, liver necrosis, and cardiac lesions in late embryogenesis with ~90% neonatal lethality. Surviving adults show portal fibrosis, altered lipid metabolism, and reduced adiposity, establishing an essential cell-autonomous role of ARNT in endothelial cells for hepatic vascular development. Conditional knockout via Cre-loxP (endothelial-specific), phenotypic analysis, MRI, gene expression analysis Hepatology High 16941684
2006 Arnt and Arnt2 are functionally non-equivalent: both support HIF-dependent hypoxic gene induction (HRE reporter, Glut-1 induction) to similar levels, but Arnt2 is practically incapable of supporting AHR-dependent xenobiotic responses (XRE reporter, CYP1A1 induction). This functional difference maps to a single His/Pro amino acid difference in the PASB region. Stable/transient expression of wild-type, mutant, and chimeric constructs in Arnt-null Hepa1-c4 cells; reporter gene assays, RT-PCR of endogenous targets Journal of Biological Chemistry High 17023418
2008 Blocking ryanodine receptor or IP3 receptor Ca2+ channels increases HIF-1β (ARNT) expression in pancreatic beta-cells; overexpression of presenilin-1 increases HIF-1β, placing HIF-1β downstream of a presenilin/Ca2+-channel signaling network. Low glucose also induces HIF-1β, identifying a nutrient/Ca2+-dependent regulatory mechanism for ARNT in beta-cells. Pharmacological blockade of intracellular Ca2+ channels, presenilin-1 overexpression, western blotting, RT-PCR in MIN6 cells and human islets Journal of Biological Chemistry Medium 18174159
2011 NF-κB directly regulates HIF-1β (ARNT) mRNA and protein expression in an evolutionarily conserved manner. NF-κB-mediated changes in HIF-1β modulate HIF-2α protein levels; HIF-1β overexpression rescues HIF-2α following NF-κB depletion. This regulation is conserved in Drosophila (NF-κB regulates tango/HIF-1β and sima/HIF-α). siRNA knockdown, overexpression, luciferase reporter assays, Drosophila genetic experiments PLoS Genetics High 21298084
2011 Fat-specific Hif1β/Arnt deletion results in lean mice with reduced adipocyte size, protection from glucose intolerance, reduced VEGF and vascular permeability in fat, and decreased Glut1/Glut4 expression with reduced glucose uptake. Hif1β knockdown in 3T3-L1 adipocytes reduces glucose uptake and blunts mitochondrial gene expression in response to hypoxia, establishing ARNT as a regulator of adipocyte glucose uptake and mitochondrial function. Adipose-specific conditional knockout (Cre-loxP), shRNA knockdown in 3T3-L1 cells, glucose uptake assays, gene expression analysis, metabolic phenotyping Cell Metabolism High 21982709
2012 ARNT controls keratinocyte differentiation through HDAC- and EGFR-dependent pathways: ARNT depletion downregulates amphiregulin (AREG), reduces EGFR and ERK1/2 phosphorylation, and increases HDAC1/2/3 protein levels (not mRNA). TSA abolishes effects of ARNT deficiency, confirming HDACs mediate this pathway. ARNT overexpression has opposite effects. Lentiviral shRNA knockdown and overexpression in N-TERT/HaCaT cells, 3D epidermal equivalents, western blotting, phosphorylation assays, HDAC activity assays Journal of Cell Science High 22505606
2012 ARNT NMR/biochemical screening identified that the ARNT PAS-B domain recruits the coactivator TACC3; small molecule KG-548 selectively binds within the ARNT PAS-B domain and disrupts the ARNT/TACC3 interaction, identifying this domain as a ligand-binding and protein-interaction interface on ARNT. NMR screening, biochemical binding assays, small-molecule disruption of protein-protein interaction ACS Chemical Biology High 23240775
2013 ARNT-deficient T cell precursors express low STAT3 and fail to differentiate into TCRαβ+CD8αα+ intestinal intraepithelial T cells after IL-15 stimulation; this defect is rescued by STAT3 overexpression. AHR-deficient mice show the same >8-fold reduction, establishing ARNT as part of an ARNT-STAT3 axis required for this T cell fate. Conditional T cell-specific ARNT knockout, STAT3 overexpression rescue, flow cytometry, IL-15 stimulation assays Nature Communications High 23836150
2014 Cardiac-specific deletion of Arnt causes rapid cardiomyopathy with lipid droplet accumulation, 2-fold increase in fatty acid oxidation, and upregulation of PPARα and its target genes. Simultaneous deletion of both Arnt and Ppara preserves cardiac function and reverses FA accumulation. ARNT directly binds the Ppara promoter in complex with HIF-2α, establishing ARNT as a direct transcriptional repressor of PPARα-driven lipid metabolism. Cardiac-specific conditional knockout, double knockout (Arnt/Ppara), ex vivo heart perfusion/FA oxidation assay, ChIP (ARNT binding to Ppara promoter), gene expression analysis Journal of Clinical Investigation High 25329697
2015 ARNT knockdown in colorectal cancer cells promotes migration and invasion via activation of the fibronectin/integrin β1/FAK signaling axis. Restoration of ARNT expression blocks this enhanced motility. ARNT loss also inhibits tumor growth in xenografts, while promoting metastatic colonization in tail-vein injection models. shRNA knockdown, ARNT rescue expression, migration/invasion assays, xenograft and tail-vein metastasis mouse models, western blotting Oncotarget Medium 25839165
2015 CK1δ phosphorylates HIF-1α in its N-terminus, reducing HIF-1α affinity for ARNT and impairing formation of a chromatin-bound HIF-1 complex (monitored by in situ PLA and FRAP). CK1δ inhibition increases lipid droplet formation and cell proliferation under hypoxia in an HIF-1α- and lipin-1-dependent manner. In situ proximity ligation assay (PLA), FRAP, CK1δ inhibition, HIF-1α mutational analysis, lipin-1 expression assays Cellular Signalling High 25744540
2016 Crystal structures of NPAS1-ARNT and NPAS3-ARNT heterodimers in complex with DNA reveal four putative ligand-binding pockets per complex and an intimate PAS-B:PAS-B association between the partners. Expanded comparison with HIF-1α-ARNT, HIF-2α-ARNT, and CLOCK-BMAL1 shows the wider bHLH-PAS family uses a shared multi-domain architecture with multiple ligand-accessible pockets. X-ray crystallography, structural comparison, biochemical validation eLife High 27782878
2016 HIF-1α drives a feed-forward loop that upregulates ARNT mRNA and protein in Hep3B hypoxic cells; forced ARNT overexpression increases HIF reporter activity under both normoxic and hypoxic conditions, suggesting ARNT can be a limiting factor for HIF signaling in some tumor cells. Gene silencing (siRNA), overexpression, qRT-PCR, western blotting, luciferase HIF reporter assays Cell Death & Disease Medium 27362802
2018 Pharmacological induction of ARNT expression (via disruption of the FKBP12/YY1 transcriptional repressor complex using FK506 or GPI-1046) leads to homodimeric ARNT-induced ALK3 (BMP receptor) transcription, activating BMP signaling and attenuating chronic kidney, cardiac, and liver fibrosis. FKBP12/YY1 complex is identified as a transcriptional repressor of ARNT. In vivo morpholino knockdown of FKBP12/YY1, small-molecule treatment, reporter assays, ChIP, gene expression analysis in multiple organ injury models Journal of Clinical Investigation High 29664738
2022 ARNT isoform 1 contains a unique CK2 phosphorylation site; CK2-mediated phosphorylation of ARNT isoform 1 depends on ligand-induced AHR nuclear translocation and is required for optimal AHR target gene regulation. The ARNT isoform 1:3 ratio in T cell lymphoma cells dictates the amplitude and direction (pro-inflammatory vs. immunosuppressive) of AHR-driven gene expression. Global/targeted transcriptomics, isoform-specific suppression, CK2 inhibition, molecular characterization of phosphorylation site, AHR nuclear translocation assays Proceedings of the National Academy of Sciences High 35290121
2025 Crystal structures of AHR-ARNT-DNA complexes bound to six distinct ligands reveal an unconventional subunit assembly with intimate PAS-B:PAS-B association between AHR and ARNT. Eight conserved residues in AHR's PAS-B ligand-binding pocket undergo dynamic rearrangements for ligand binding via hydrophobic and π-π interactions. A segment of AHR undergoes a ligand-driven structural transition from chaperone engagement to ARNT heterodimer stabilization. X-ray crystallography of AHR-ARNT-DNA complexes with six ligands (Tapinarof, FICZ, BaP, BNF, Indigo, Indirubin), structural analysis Nature Communications High 39900897
2021 ARNT deficiency in melanoma cells represses PDK1 and NQO1 expression, leading to increased ROS via enhanced mitochondrial oxidative phosphorylation and elevated glucose uptake; ROS mediates ARNT-deficiency-induced cell migration and invasion, as demonstrated by ROS scavengers (NAC) and OXPHOS inhibitors blocking this phenotype in vitro and tumor extravasation in mouse models. siRNA knockdown of ARNT and PDK1, N-acetylcysteine/CCCP/rotenone treatment, migration/invasion assays, mouse extravasation model, ROS measurement Oncogenesis Medium 33446631
2000 A novel ARNT-interacting protein (AINT) was identified whose C-terminus interacts with the PAS domain of ARNT in yeast two-hybrid and in vitro pull-down assays. AINT overexpression causes non-nuclear (cytoplasmic) localization of ARNT, identifying a protein that can sequester ARNT from the nucleus. Yeast two-hybrid, in vitro interaction assay, overexpression with subcellular localization analysis Mechanisms of Development Medium 11025203
2022 Crystal structures of NPAS4-ARNT and NPAS4-ARNT2 heterodimers on DNA reveal a uniquely interconnected domain conformation for NPAS4 and differentially configured heterodimeric arrangements: ARNT and ARNT2 PAS-A domains adopt variable conformations, and the ARNT PAS-A domain forms distinct interfaces with both NPAS4 PAS-A and PAS-B domains compared to other ARNT heterodimers. X-ray crystallography, biochemical binding assays, cell-based reporter assays Proceedings of the National Academy of Sciences High 36343253

Source papers

Stage 0 corpus · 100 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
1992 Identification of the Ah receptor nuclear translocator protein (Arnt) as a component of the DNA binding form of the Ah receptor. Science (New York, N.Y.) 728 1317062
1997 Abnormal angiogenesis and responses to glucose and oxygen deprivation in mice lacking the protein ARNT. Nature 620 9121557
2005 Brain and muscle Arnt-like protein-1 (BMAL1), a component of the molecular clock, regulates adipogenesis. Proceedings of the National Academy of Sciences of the United States of America 434 16093318
1995 DNA binding specificities and pairing rules of the Ah receptor, ARNT, and SIM proteins. The Journal of biological chemistry 310 7592839
1998 Expression of ARNT, ARNT2, HIF1 alpha, HIF2 alpha and Ah receptor mRNAs in the developing mouse. Mechanisms of development 272 9545558
1997 ARNT-deficient mice and placental differentiation. Developmental biology 254 9398442
1994 Identification of functional domains of the aryl hydrocarbon receptor nuclear translocator protein (ARNT). Molecular and cellular biology 230 8065341
2017 Aryl hydrocarbon receptor (AHR): "pioneer member" of the basic-helix/loop/helix per-Arnt-sim (bHLH/PAS) family of "sensors" of foreign and endogenous signals. Progress in lipid research 225 28606467
2010 MicroRNA-101 negatively regulates Ezh2 and its expression is modulated by androgen receptor and HIF-1alpha/HIF-1beta. Molecular cancer 210 20478051
1993 Ligand-dependent recruitment of the Arnt coregulator determines DNA recognition by the dioxin receptor. Molecular and cellular biology 197 8384309
2005 ER alpha-AHR-ARNT protein-protein interactions mediate estradiol-dependent transrepression of dioxin-inducible gene transcription. The Journal of biological chemistry 166 15837795
1995 Possible function of Ah receptor nuclear translocator (Arnt) homodimer in transcriptional regulation. Proceedings of the National Academy of Sciences of the United States of America 163 7892203
1999 Induction and nuclear translocation of hypoxia-inducible factor-1 (HIF-1): heterodimerization with ARNT is not necessary for nuclear accumulation of HIF-1alpha. Journal of cell science 152 10085255
1994 Tissue specific expression of the rat Ah-receptor and ARNT mRNAs. Nucleic acids research 150 8065918
2012 The clock gene, brain and muscle Arnt-like 1, regulates adipogenesis via Wnt signaling pathway. FASEB journal : official publication of the Federation of American Societies for Experimental Biology 143 22611086
2022 Functions of the aryl hydrocarbon receptor (AHR) beyond the canonical AHR/ARNT signaling pathway. Biochemical pharmacology 141 36528068
2011 Evolutionary conserved regulation of HIF-1β by NF-κB. PLoS genetics 138 21298084
2014 Role of AhR/ARNT system in skin homeostasis. Archives of dermatological research 130 24966027
1996 Cooperative interaction between AhR.Arnt and Sp1 for the drug-inducible expression of CYP1A1 gene. The Journal of biological chemistry 126 8647831
2002 DNA binding and protein interactions of the AHR/ARNT heterodimer that facilitate gene activation. Chemico-biological interactions 122 12213385
2009 AhR and ARNT modulate ER signaling. Toxicology 121 19778576
2014 Regulatory crosstalk and interference between the xenobiotic and hypoxia sensing pathways at the AhR-ARNT-HIF1α signaling node. Chemico-biological interactions 112 24824450
2006 Blocking expression of AHR2 and ARNT1 in zebrafish larvae protects against cardiac toxicity of 2,3,7,8-tetrachlorodibenzo-p-dioxin. Toxicological sciences : an official journal of the Society of Toxicology 97 16936225
2013 Brain and muscle Arnt-like 1 is a key regulator of myogenesis. Journal of cell science 90 23525013
2004 Gestational exposure of Ahr and Arnt hypomorphs to dioxin rescues vascular development. Proceedings of the National Academy of Sciences of the United States of America 88 15545609
2014 Hypoxia-inducible aryl hydrocarbon receptor nuclear translocator (ARNT) (HIF-1β): is it a rare exception? Molecular medicine (Cambridge, Mass.) 86 24849811
2011 The differential role of Hif1β/Arnt and the hypoxic response in adipose function, fibrosis, and inflammation. Cell metabolism 82 21982709
2004 A novel induction mechanism of the rat CYP1A2 gene mediated by Ah receptor-Arnt heterodimer. Biochemical and biophysical research communications 80 15144902
1996 Cloning and selective expression in brain and kidney of ARNT2 homologous to the Ah receptor nuclear translocator (ARNT). Biochemical and biophysical research communications 76 8753765
2014 AhR and Arnt differentially regulate NF-κB signaling and chemokine responses in human bronchial epithelial cells. Cell communication and signaling : CCS 75 25201625
2005 Identification of zebrafish ARNT1 homologs: 2,3,7,8-tetrachlorodibenzo-p-dioxin toxicity in the developing zebrafish requires ARNT1. Molecular pharmacology 70 16306231
2016 NPAS1-ARNT and NPAS3-ARNT crystal structures implicate the bHLH-PAS family as multi-ligand binding transcription factors. eLife 69 27782878
2003 Critical enhancer region to which AhR/ARNT and Sp1 bind in the human CYP1B1 gene. Journal of biochemistry 62 12801909
2000 Isolation and characterization of AINT: a novel ARNT interacting protein expressed during murine embryonic development. Mechanisms of development 61 11025203
2014 Brain and muscle Arnt-like 1 promotes skeletal muscle regeneration through satellite cell expansion. Experimental cell research 54 25218946
2015 Nuciferine downregulates Per-Arnt-Sim kinase expression during its alleviation of lipogenesis and inflammation on oleic acid-induced hepatic steatosis in HepG2 cells. Frontiers in pharmacology 52 26539118
2012 MicroRNA 107 partly inhibits endothelial progenitor cells differentiation via HIF-1β. PloS one 49 22792280
2006 Unique and overlapping transcriptional roles of arylhydrocarbon receptor nuclear translocator (Arnt) and Arnt2 in xenobiotic and hypoxic responses. The Journal of biological chemistry 47 17023418
2022 Melatonin Prevents against Ethanol-Induced Liver Injury by Mitigating Ferroptosis via Targeting Brain and Muscle ARNT-like 1 in Mice Liver and HepG2 Cells. Journal of agricultural and food chemistry 46 36166594
2003 Expression of Arnt and Arnt2 mRNA in developing murine tissues. The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society 46 12502753
2008 Glucose and endoplasmic reticulum calcium channels regulate HIF-1beta via presenilin in pancreatic beta-cells. The Journal of biological chemistry 45 18174159
2007 Analysis of Ah receptor-ARNT and Ah receptor-ARNT2 complexes in vitro and in cell culture. Toxicological sciences : an official journal of the Society of Toxicology 44 18096572
2012 ARNT controls the expression of epidermal differentiation genes through HDAC- and EGFR-dependent pathways. Journal of cell science 43 22505606
2003 T cell-specific disruption of arylhydrocarbon receptor nuclear translocator (Arnt) gene causes resistance to 2,3,7,8-tetrachlorodibenzo-p-dioxin-induced thymic involution. Journal of immunology (Baltimore, Md. : 1950) 41 14530333
2009 Regulation of glucose metabolism-related genes and VEGF by HIF-1alpha and HIF-1beta, but not HIF-2alpha, in gastric cancer. Experimental & molecular medicine 40 19287200
2006 Disruption of the Arnt gene in endothelial cells causes hepatic vascular defects and partial embryonic lethality in mice. Hepatology (Baltimore, Md.) 40 16941684
2015 Down-regulation of ARNT promotes cancer metastasis by activating the fibronectin/integrin β1/FAK axis. Oncotarget 39 25839165
2013 The aryl hydrocarbon receptor nuclear translocator (ARNT) family of proteins: transcriptional modifiers with multi-functional protein interfaces. Current molecular medicine 39 23116263
2012 Regulating the ARNT/TACC3 axis: multiple approaches to manipulating protein/protein interactions with small molecules. ACS chemical biology 39 23240775
1999 Ah receptor and ARNT protein and mRNA concentrations in rat prostate: effects of stage of development and 2,3,7, 8-tetrachlorodibenzo-p-dioxin treatment. Toxicology and applied pharmacology 39 10053172
1999 Specificity of DNA binding of the c-Myc/Max and ARNT/ARNT dimers at the CACGTG recognition site. Nucleic acids research 39 10454619
2015 Selective Aryl Hydrocarbon Receptor Modulator 3,3'-Diindolylmethane Impairs AhR and ARNT Signaling and Protects Mouse Neuronal Cells Against Hypoxia. Molecular neurobiology 38 26476840
2000 Estrous cycle-dependent changes in the expression of aromatic hydrocarbon receptor (AHR) and AHR-nuclear translocator (ARNT) mRNAs in the rat ovary and liver. Chemico-biological interactions 38 10728779
2014 Cardiac-specific ablation of ARNT leads to lipotoxicity and cardiomyopathy. The Journal of clinical investigation 37 25329697
2010 Per-arnt-sim (PAS) domain-containing protein kinase is downregulated in human islets in type 2 diabetes and regulates glucagon secretion. Diabetologia 37 21181396
2022 Interaction between AhR and HIF-1 signaling pathways mediated by ARNT/HIF-1β. BMC pharmacology & toxicology 36 35473600
2001 Expression of AhR and ARNT mRNA in cultured human endometrial explants exposed to TCDD. Toxicological sciences : an official journal of the Society of Toxicology 36 11452142
1995 The dioxin receptor and its nuclear translocator (Arnt) in the rat brain. Neuroreport 35 8741762
2025 Structural basis for the ligand-dependent activation of heterodimeric AHR-ARNT complex. Nature communications 33 39900897
2018 Variation in cell-associated unspliced HIV RNA on antiretroviral therapy is associated with the circadian regulator brain-and-muscle-ARNT-like-1. AIDS (London, England) 32 30005017
2021 Targeting HIF2α-ARNT hetero-dimerisation as a novel therapeutic strategy for pulmonary arterial hypertension. The European respiratory journal 31 32972983
2015 CK1δ restrains lipin-1 induction, lipid droplet formation and cell proliferation under hypoxia by reducing HIF-1α/ARNT complex formation. Cellular signalling 31 25744540
2013 Reciprocal regulation of the basic helix-loop-helix/Per-Arnt-Sim partner proteins, Arnt and Arnt2, during neuronal differentiation. Nucleic acids research 30 23599003
2013 The Aryl Hydrocarbon Receptor Nuclear Translocator (ARNT/HIF-1β) is influenced by hypoxia and hypoxia-mimetics. Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology 30 24081025
2010 Hypoxia-mediated control of HIF/ARNT machinery in epidermal keratinocytes. Biochimica et biophysica acta 30 21129412
2022 Structures of NPAS4-ARNT and NPAS4-ARNT2 heterodimers reveal new dimerization modalities in the bHLH-PAS transcription factor family. Proceedings of the National Academy of Sciences of the United States of America 29 36343253
2009 HIF-1beta determines ABCA1 expression under hypoxia in human macrophages. The international journal of biochemistry & cell biology 28 19828131
2001 Hypoxia regulates avian cardiac Arnt and HIF-1alpha mRNA expression. Biochemical and biophysical research communications 28 11401503
2020 ARNT-dependent HIF-2 transcriptional activity is not sufficient to regulate downstream target genes in neuroblastoma. Experimental cell research 27 31945318
2010 Malformation of certain brain blood vessels caused by TCDD activation of Ahr2/Arnt1 signaling in developing zebrafish. Aquatic toxicology (Amsterdam, Netherlands) 27 20554057
2019 Leishmania Infection Induces Macrophage Vascular Endothelial Growth Factor A Production in an ARNT/HIF-Dependent Manner. Infection and immunity 26 31451620
2019 Transcription Factors AhR/ARNT Regulate the Expression of CYP6CY3 and CYP6CY4 Switch Conferring Nicotine Adaptation. International journal of molecular sciences 26 31547315
2016 A HIF-1α-driven feed-forward loop augments HIF signalling in Hep3B cells by upregulation of ARNT. Cell death & disease 26 27362802
2013 Hypoxia-inducible factor-1β (HIF-1β) is upregulated in a HIF-1α-dependent manner in 518A2 human melanoma cells under hypoxic conditions. Biochemical and biophysical research communications 26 23541582
1994 Immunohistochemical double-staining for Ah receptor and ARNT in human embryonic palatal shelves. Teratology 26 7716743
2011 RNA expressions of AHR, ARNT and CYP1B1 are influenced by AHR Arg554Lys polymorphism. Molecular genetics and metabolism 25 21742528
2018 Ligand-induced perturbation of the HIF-2α:ARNT dimer dynamics. PLoS computational biology 23 29489822
2004 Linked expression of Ah receptor, ARNT, CYP1A1, and CYP1B1 in rat mammary epithelia, in vitro, is each substantially elevated by specific extracellular matrix interactions that precede branching morphogenesis. Toxicological sciences : an official journal of the Society of Toxicology 23 15297627
2002 The aryl hydrocarbon receptor (AhR) and its nuclear translocator (Arnt) are dispensable for normal mammary gland development but are required for fertility. Genesis (New York, N.Y. : 2000) 23 11892012
2021 Functional characterization of the transcription factors AhR and ARNT in Nilaparvata lugens. Pesticide biochemistry and physiology 21 34119220
2015 Per-Arnt-Sim Kinase (PASK): An Emerging Regulator of Mammalian Glucose and Lipid Metabolism. Nutrients 21 26371032
2023 Benvitimod Inhibits IL-4- and IL-13-Induced Tight Junction Impairment by Activating AHR/ARNT Pathway and Inhibiting STAT6 Phosphorylation in Human Keratinocytes. The Journal of investigative dermatology 20 37734479
2016 Aryl hydrocarbon receptor nuclear translocator (ARNT) isoforms control lymphoid cancer cell proliferation through differentially regulating tumor suppressor p53 activity. Oncotarget 20 26909609
2017 MiR-107 suppresses cell proliferation and tube formation of Ewing sarcoma cells partly by targeting HIF-1β. Human cell 19 29075999
2013 The ARNT-STAT3 axis regulates the differentiation of intestinal intraepithelial TCRαβ⁺CD8αα⁺ cells. Nature communications 19 23836150
2011 Human mutation within Per-Arnt-Sim (PAS) domain-containing protein kinase (PASK) causes basal insulin hypersecretion. The Journal of biological chemistry 19 22065581
2004 Altered DNA binding specificity of Arnt by selection of partner bHLH-PAS proteins. Nucleic acids research 19 15190133
2018 Pharmacological induction of hypoxia-inducible transcription factor ARNT attenuates chronic kidney failure. The Journal of clinical investigation 18 29664738
2016 VEGF expression is regulated by HIF-1α and ARNT in 3D KYSE-70, esophageal cancer cell spheroids. Cell biology international 18 27542820
2014 Coactivator recruitment of AhR/ARNT1. International journal of molecular sciences 18 24950180
2004 Expression of aryl hydrocarbon receptor (AHR) and aryl hydrocarbon receptor nuclear translocator (ARNT) mRNA expression in human spermatozoa. Medical science monitor : international medical journal of experimental and clinical research 18 15114261
2004 Significant association between nonsyndromic oral clefts and arylhydrocarbon receptor nuclear translocator (ARNT). American journal of medical genetics. Part A 18 15368494
2003 Identification of novel splice variants of ARNT and ARNT2 in the rat. Biochemical and biophysical research communications 18 12684048
2022 AhR promotes phosphorylation of ARNT isoform 1 in human T cell malignancies as a switch for optimal AhR activity. Proceedings of the National Academy of Sciences of the United States of America 17 35290121
2021 ARNT deficiency represses pyruvate dehydrogenase kinase 1 to trigger ROS production and melanoma metastasis. Oncogenesis 17 33446631
2021 GPC5 suppresses lung cancer progression and metastasis via intracellular CTDSP1/AhR/ARNT signaling axis and extracellular exosome secretion. Oncogene 17 34079082
2015 ArnT proteins that catalyze the glycosylation of lipopolysaccharide share common features with bacterial N-oligosaccharyltransferases. Glycobiology 17 26515403
2010 Molecular and functional characterization of aryl hydrocarbon receptor nuclear translocator 1 (ARNT1) and ARNT2 in chicken (Gallus gallus). Comparative biochemistry and physiology. Toxicology & pharmacology : CBP 17 21134488
2015 Expression of aryl hydrocarbon receptor 1 (AHR1), AHR1 nuclear translocator 1 (ARNT1) and CYP1 family monooxygenase mRNAs and their activity in chicken ovarian follicles following in vitro exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). Toxicology letters 16 26043675
2003 ARNT gene multiplicity in amphibians: characterization of ARNT2 from the frog Xenopus laevis. Journal of experimental zoology. Part B, Molecular and developmental evolution 16 14984034

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