| 1999 |
ECSIT acts as an adaptor protein bridging TRAF6 to MEKK-1 in the Toll/IL-1 signaling pathway; wild-type ECSIT accelerates MEKK-1 processing while a dominant-negative fragment blocks MEKK-1 processing and NF-κB activation. |
Yeast two-hybrid, co-immunoprecipitation, dominant-negative overexpression, NF-κB reporter assays |
Genes & development |
High |
10465784
|
| 2003 |
ECSIT is required for BMP signaling during mouse embryogenesis; it associates constitutively with Smad4 and associates with Smad1 in a BMP-inducible manner, and together with Smad1/Smad4 binds promoters of specific BMP target genes. Ecsit null mice show impaired mesoderm formation and embryonic lethality at E7.5. |
Targeted gene knockout (null mutation), co-immunoprecipitation, chromatin immunoprecipitation, shRNA knockdown, reporter assays |
Genes & development |
High |
14633973
|
| 2007 |
ECSIT localizes to mitochondria via an N-terminal targeting signal, where it interacts with the assembly chaperone NDUFAF1 in 500–850 kDa complexes; RNAi knockdown of either ECSIT or NDUFAF1 severely impairs mitochondrial complex I assembly and function. |
Affinity purification, subcellular fractionation, RNAi knockdown, blue native PAGE, mitochondrial function assays |
Genes & development |
High |
17344420
|
| 2012 |
TRIM59 interacts with ECSIT (co-immunoprecipitation) and acts as a negative regulator of NF-κB and IRF-3/7-mediated signaling; overexpression of TRIM59 represses NF-κB, IFN-β promoter, and ISRE transcriptional activities, while TRIM59 knockdown enhances them. TRIM59 also inhibits phosphorylation and dimerization of IRF3 and IRF7. |
Co-immunoprecipitation, luciferase reporter assays, siRNA knockdown, Western blot (phosphorylation) |
Biochemical and biophysical research communications |
Medium |
22588174
|
| 2014 |
Upon LPS stimulation, ECSIT forms a trimeric complex with TAK1 and TRAF6; ECSIT interacts with each protein and regulates TAK1 activity to activate NF-κB. ECSIT mutants lacking the TAK1- or TRAF6-interacting domain cannot restore NF-κB activity or cytokine production in ECSIT-knockdown cells. |
Co-immunoprecipitation of endogenous proteins, ECSIT-knockdown (THP-1), domain-deletion mutant rescue, NF-κB reporter assay, cytokine ELISA |
The Journal of biological chemistry |
High |
25371197
|
| 2014 |
ECSIT ubiquitination at lysine 372 is required for its interaction with p65/p50 NF-κB proteins and their nuclear co-localization following TLR4 stimulation; the K372A mutant fails to interact with NF-κB subunits and cannot restore NF-κB DNA-binding activity or cytokine production in ECSIT-knockdown cells. |
Co-immunoprecipitation, site-directed mutagenesis (K372A), subcellular fractionation, NF-κB EMSA/reporter assays, cytokine measurement, ECSIT-knockdown rescue |
Molecular biology of the cell |
High |
25355951
|
| 2014 |
ECSIT serves as an essential scaffolding protein that bridges RIG-I and MDA5 to VISA (MAVS) on mitochondria, mediating virus-triggered type I IFN induction; ECSIT overexpression potentiates IRF3 activation and IFNB1 expression, while ECSIT knockdown impairs these antiviral responses. |
Co-immunoprecipitation, siRNA knockdown, overexpression, IRF3 activation assay, IFNB1 reporter/expression assay |
Journal of innate immunity |
Medium |
25228397
|
| 2014 |
Hepatitis B virus X protein (HBx) physically interacts with ECSIT (GST pulldown and co-IP); the interacting region of HBx maps to amino acids 51–80; the HBx–ECSIT interaction augments IL-1β-induced NF-κB activation by increasing IKK and IκBα phosphorylation and promoting p65/p50 nuclear translocation. |
GST pulldown, co-immunoprecipitation, CytoTrap two-hybrid, deletion analysis, NF-κB reporter assay, Western blot (phosphorylation) |
Virus research |
Medium |
25449573
|
| 2017 |
Peroxiredoxin-6 (Prdx6) competitively interacts with ECSIT at the TRAF-C domain of TRAF6, disrupting the TRAF6–ECSIT complex; this inhibits ECSIT ubiquitination, reduces mitochondrial ROS production, and suppresses TLR4-induced NF-κB activation and bactericidal activity. |
Co-immunoprecipitation, Prdx6 knockdown, competitive binding assay, mitochondrial ROS measurement, NF-κB reporter, cytokine assay, bacterial survival assay |
Frontiers in cellular and infection microbiology |
Medium |
28393051
|
| 2018 |
Conditional knockout of ECSIT in macrophages completely disrupts complex I activity and the CI holoenzyme, causes a metabolic shift to glycolysis, increases constitutive mitochondrial ROS, and impairs mitophagy. ECSIT associates with the mitophagy regulator PINK1 and undergoes Parkin-dependent ubiquitination; ECSIT deletion increases mitochondrial Parkin without restoring mitophagy. |
Conditional knockout mouse (Cre-lox), complex I activity assay, blue native PAGE, metabolic flux (Seahorse), mROS measurement, co-immunoprecipitation (PINK1), ubiquitination assay |
Cell reports |
High |
29514094
|
| 2018 |
The ECSIT V140A mutation increases ECSIT affinity for the S100A8/S100A9 heterodimer, potentiating NF-κB activation and NADPH oxidase activity. ECSIT-T419C knock-in mice showed higher peritoneal NADPH oxidase activity than wild-type in response to LPS. ECSIT-V140A-expressing ENKTL cells produced TNF-α and IFN-γ that induced macrophage activation and cytokine secretion. |
Exome sequencing, knock-in mouse model, co-immunoprecipitation, NADPH oxidase activity assay, NF-κB reporter, cytokine measurement, xenograft model |
Nature medicine |
High |
29291352
|
| 2019 |
CRBN (cereblon) translocates to mitochondria upon TLR4 stimulation and disrupts the ECSIT–TRAF6 complex, thereby inhibiting TRAF6-induced ubiquitination of ECSIT and suppressing mitochondrial ROS production and bactericidal activity. |
Co-immunoprecipitation, CRBN knockdown/knockout, mitochondrial fractionation, mROS measurement, bacterial survival assay |
Frontiers in immunology |
Medium |
31620128
|
| 2019 |
p62 (SQSTM1) interacts with the internal domain of ECSIT, inhibits TRAF6–ECSIT association, and attenuates ECSIT ubiquitination, thereby suppressing TLR4-mediated NF-κB activation; p62-knockout MEF cells and mice show markedly enhanced TLR4 signaling and inflammatory responses. |
Co-immunoprecipitation, domain mapping, p62 knockout MEF cells, p62 knockout mice, NF-κB reporter, cytokine measurement, ubiquitination assay |
Immune network |
Medium |
31281713
|
| 2021 |
Human ECSIT (hECSIT) is highly labile compared to murine Ecsit; low hECSIT levels lead to reduced complex I assembly and activity, impaired oxidative phosphorylation, reduced ATP production, altered mitochondrial dynamics (reduced fusion, increased fission), and severe cardiac hypertrophy in humanized knock-in mice. ECSIT also has a cardiomyocyte-intrinsic role in mitochondrial function. |
Humanized knock-in mouse (mEcsit replaced by hECSIT), complex I activity/assembly assay, Seahorse metabolic flux, mitochondrial morphology imaging, cardiac function assays |
JCI insight |
High |
34032637
|
| 2023 |
RANKL promotes ECSIT–TRAF6 interaction and increases mitochondrial ECSIT levels in osteoclast progenitors; ECSIT silencing decreases complex I activity, oxygen consumption, NAD+/NADH ratio, ATP production, and increases mitochondrial ROS, abrogating RANKL-driven stimulation of oxidative phosphorylation and osteoclastogenesis. 17β-estradiol (E2) abrogates these RANKL-induced effects on ECSIT. |
Co-immunoprecipitation, subcellular fractionation, shRNA knockdown, Seahorse XF metabolic analysis, complex I activity assay, ROS measurement, mitochondrial membrane potential assay |
Frontiers in endocrinology |
High |
37152948
|
| 2023 |
ECSIT-N209I ENU-induced mutation causes tissue-specific complex I assembly defects specifically in cardiac tissue, leading to hypertrophic cardiomyopathy without affecting complex I in other tissues, demonstrating tissue-specific requirements for ECSIT in complex I assembly. |
ENU mutagenesis screen, Seahorse extracellular flux, biochemical complex I assays, blue native PAGE, cardiac phenotyping |
Cardiovascular research |
Medium |
37395010
|
| 2023 |
Intestinal cell-specific ablation of ECSIT causes metabolic reprogramming toward amino acid-based metabolism, demethylation and upregulation of eIF4F pathway genes, and consequently enhanced YAP protein translation (not transcription), disrupting intestinal differentiation and promoting tumorigenesis. |
Intestinal epithelium-specific conditional knockout, proteomics, metabolomics, ribosome profiling/translation assays, Western blot, reporter assays |
Advanced science |
Medium |
37409430
|
| 2024 |
ECSIT mediates fumarate synthesis in CD8+ T cells; T cell-specific ECSIT ablation abolishes fumarate production and abrogates TCF-1 expression via KDM5-mediated demethylation of the TCF-1 promoter, impairing memory CD8+ T cell differentiation in a cell-intrinsic manner. |
T cell-specific conditional knockout, metabolomics (fumarate measurement), ChIP/methylation analysis, KDM5 inhibition, adoptive transfer experiments |
Nature cell biology |
High |
38326554
|
| 2025 |
A novel 42-kDa ECSIT isoform encoded by transcript variant Ecsit-X4 localizes to mitochondria of adult cardiomyocytes; it interacts with STAT3 and increases mitochondrial STAT3 levels and serine 727 phosphorylation, thereby promoting mitochondrial bioenergetics and protecting against pressure overload-induced cardiac hypertrophy. |
AAV9-mediated gene therapy, cardiomyocyte-specific Ecsit conditional knockout, co-immunoprecipitation (STAT3 interaction), Western blot (phospho-STAT3-S727), mitochondrial fractionation, Seahorse metabolic analysis, TAC surgical model |
Advanced science |
Medium |
39746855
|
| 2025 |
Mycobacterium tuberculosis virulence factor HBHA directly binds ECSIT, disrupts the ECSIT–TRAF6 complex, and inhibits ECSIT ubiquitination in macrophages, thereby suppressing autophagy (LC3-II conversion and Beclin-1 expression unchanged in ECSIT-knockdown cells upon HBHA treatment) and promoting intracellular mycobacterial survival. |
Co-immunoprecipitation, ECSIT knockdown (RAW264.7), ubiquitination assay, LC3-II/Beclin-1 Western blot, intracellular bacterial survival assay |
Frontiers in immunology |
Medium |
41209015
|
| 2026 |
Mitochondria-targeted ECSIT overexpression promotes localization of deubiquitinase OTUD3 to mitochondria; OTUD3 then stabilizes SIRT3 via deubiquitination, inhibiting mtDNA oxidation and alleviating diet-induced MASH phenotypes. |
Mitochondria-targeted transgenic mice (ECSITMTG), co-immunoprecipitation, deubiquitination assay, mitochondrial fractionation, mtDNA oxidation measurement, dietary MASH models |
Advanced science |
Medium |
41640247
|