| 2003 |
JNK (mitochondrially localized) directly phosphorylates BimEL at Ser65, potentiating its proapoptotic activity during trophic factor deprivation. JNK also transcriptionally induces BimEL expression, and both transcriptional and posttranslational regulation converge to promote BAX-dependent cytochrome c release and apoptosis. |
In vitro kinase assay, site-directed mutagenesis (S65A), co-expression studies, pharmacological JNK pathway inhibition/activation |
Neuron |
High |
12818176
|
| 2004 |
JNK catalyzes phosphorylation of BimEL at Ser65 both in vitro and in vivo; this phosphorylation promotes BimEL's proapoptotic effect in primary cerebellar granule neurons and mediates p75NTR-induced neuronal apoptosis. Genetic knockdown of BimEL by RNAi significantly impaired p75NTR-induced apoptosis. |
In vitro kinase assay, RNAi knockdown, dominant-negative BimEL expression in primary neurons |
The Journal of neuroscience |
High |
15470142
|
| 2006 |
p38 MAP kinase directly phosphorylates BimEL at Ser65 in vitro and in vivo, potentiating apoptosis induced by sodium arsenite. A non-phosphorylatable S65A mutant of BimEL failed to potentiate apoptosis, identifying Ser65 as a shared regulatory target for both JNK and p38. |
In vitro kinase assay, S65A mutagenesis, pharmacological p38 inhibition, ectopic expression in PC12 cells |
The Journal of biological chemistry |
High |
16818494
|
| 2005 |
Akt directly phosphorylates BimEL at Ser87 in vitro. IL-3-stimulated Akt activity promotes BimEL phosphorylation and binding to 14-3-3 proteins. Mutation of Ser87 dramatically increases BimEL apoptotic potency, indicating Akt phosphorylation attenuates BimEL's proapoptotic function. |
In vitro Akt kinase assay with GST-BimEL fusion protein, site-directed mutagenesis (S87A), co-immunoprecipitation with 14-3-3 proteins, PI3K inhibitor (LY294002) |
The Journal of biological chemistry |
High |
16282323
|
| 2008 |
Multisite phosphorylation regulates Bim by distinct mechanisms in vivo: phosphorylation at Thr112 increases Bim binding to Bcl-2 (promoting death), while phosphorylation at Ser55, Ser65, and Ser73 promotes proteasomal degradation of Bim (reducing death). These were demonstrated using knock-in mice expressing phosphorylation-defective Bim alleles. |
Knock-in mouse models with phosphorylation-defective Bim alleles, in vivo apoptosis assays |
Molecular cell |
High |
18498746
|
| 2009 |
BimEL is targeted for proteasomal degradation via the F-box protein βTrCP following phosphorylation of a conserved degron by Rsk1/2, with ERK1/2 phosphorylation of BimEL at Ser69 promoting this process. A phosphorylation-defective BimEL mutant unable to bind βTrCP was stabilized and more potently induced apoptosis. |
Co-immunoprecipitation, phosphorylation-defective mutants, siRNA knockdown of βTrCP and Rsk1/2, ubiquitination assays |
Molecular cell |
High |
19150432
|
| 2007 |
ERK1/2-dependent phosphorylation of BimEL at Ser65 causes rapid dissociation of preformed BimEL/Mcl-1 and BimEL/Bcl-xL complexes in response to survival factors. This dissociation is specific to BimEL and is a prerequisite step in ERK1/2-driven proteasomal degradation of BimEL. |
Co-immunoprecipitation of endogenous complexes, ERK1/2 activation/inhibition, phospho-specific antibodies, Bim-/- cells |
The EMBO journal |
High |
17525735
|
| 2002 |
BimEL requires both its BH3 domain and C-terminal hydrophobic region for mitochondrial targeting and proapoptotic activity. A BH3 domain mutant (L→A) that cannot bind Bcl-XL still activates Bax and induces apoptosis, but removal of the C-terminal domain from this mutant abolishes mitochondrial targeting and Bax activation. Bcl-XL suppresses BimEL-induced Bax conformational change through a mechanism independent of direct heterodimerization with Bax or BimEL. |
Domain deletion/point mutagenesis, subcellular fractionation, Bax conformational change assay, isolated mitochondria assay |
The Journal of biological chemistry |
High |
12198137
|
| 2004 |
Unphosphorylated BimEL is sequestered to microtubules via direct interaction with tubulin in T cells; phosphorylated BimEL is released from microtubules. Released BimEL is cleaved by caspases at an early stage of apoptosis to generate a hyperactive N-terminally truncated form that more efficiently targets Bcl-2, creating a positive feedback amplification of apoptotic signaling. |
Biochemical fractionation, co-immunoprecipitation with tubulin, caspase cleavage assays, overexpression of cleaved BimEL variants |
Proceedings of the National Academy of Sciences |
Medium |
14732682
|
| 2005 |
Gadd45a expression causes dissociation of Bim from microtubule-associated components and its translocation to mitochondria. At mitochondria, Bim accumulates and interacts with Bcl-2, displacing Bax from Bcl-2 complexes to release cytochrome c. Gadd45a acts upstream by interacting with EF-1α and inhibiting microtubule bundling; deletion of the EF-1α-binding domain of Gadd45a prevents Bim translocation. |
Inducible Gadd45a expression, subcellular fractionation, co-immunoprecipitation, siRNA knockdown of Bim, domain deletion mutants |
Molecular and cellular biology |
Medium |
15899854
|
| 2005 |
The cytoprotective peptide humanin (HN) directly binds BimEL (but not BimL or BimS) as demonstrated by in vitro protein binding, immunoprecipitation, and coimmunolocalization. HN inhibits BimEL-induced cytochrome c and SMAC release from isolated Bax-/- mitochondria and prevents BimEL-induced Bak oligomerization, showing HN suppresses BimEL activity independently of Bax. |
In vitro protein binding assay, immunoprecipitation, coimmunolocalization, isolated mitochondria assay with Bax-/- cells |
The Journal of biological chemistry |
High |
15661735
|
| 2002 |
BimL added directly to isolated mitochondria does not trigger cytochrome c release or activate Bax, but can directly inhibit Bcl-2 or Bcl-xL. This distinguishes Bim functionally from Bid, which directly activates Bax at the mitochondria. |
Cell-free assay with isolated mitochondria, cytochrome c release assay, overexpression in cells |
FEBS letters |
Medium |
12095614
|
| 2007 |
BimS undergoes rapid mitochondrial translocation and membrane insertion without detectable binding to anti-apoptotic Bcl-2 proteins, leading to Bax recruitment/activation and apoptosis. Mutational analysis showed mitochondrial targeting, but not Bcl-2/Mcl-1 binding, is required for BimS-induced apoptosis. In yeast (lacking anti-apoptotic Bcl-2 proteins), BimS enhanced Bax killing activity, demonstrating Bcl-2-family-independent apoptosis induction. |
Regulated expression with conditional system, subcellular fractionation, co-immunoprecipitation, mutagenesis, yeast reconstitution assay |
The Journal of cell biology |
High |
17517961
|
| 2008 |
RACK1 forms a complex with dynein light chain 1 (DLC1/DYNLL1) and BimEL. Upon paclitaxel treatment, this complex together with CIS promotes BimEL ubiquitination and degradation via an ElonginB/C-Cullin2-CIS E3 ligase complex, conferring paclitaxel resistance. |
Yeast two-hybrid, co-immunoprecipitation, ubiquitination assay, siRNA knockdown, in vivo tumor models |
The Journal of biological chemistry |
Medium |
18420585
|
| 2009 |
BimEL is an intrinsically disordered protein (IDP) that can be degraded by uncapped 20S proteasomes in the absence of poly-ubiquitylation. Although BimEL undergoes K48-linked poly-ubiquitylation at two lysine residues, a double lysine mutant (BimELΔKK) without ubiquitination still undergoes ERK1/2-driven proteasome-dependent turnover. MCL-1 binding to BimEL prevents 20S proteasome degradation. |
Ubiquitin-binding domain pulldowns, proteasome assay with purified 20S proteasome, lysine mutants, Rpn2 knockdown, β-TrCP inhibition |
Journal of cell science |
High |
21378313
|
| 2013 |
BimEL is phosphorylated by Aurora A kinase during early mitosis and dephosphorylated by PP2A after mitotic exit. Aurora A phosphorylation stimulates BimEL binding to βTrCP, promoting BimEL ubiquitination and degradation during mitosis. Knockdown of Bim significantly increased resistance to Aurora A inhibitor MLN8054. |
In vitro kinase assay, co-immunoprecipitation, ubiquitination assay, siRNA knockdown, pharmacological inhibition of PP2A/Aurora A |
Cell death and differentiation |
High |
23912711
|
| 2011 |
Cyclin B1 co-immunoprecipitates with endogenous Bim in mitotic extracts, and active recombinant Cdk1/cyclin B1 phosphorylates BimEL and BimL in vitro. Ser44 on BimL was identified as a Cdk1 phosphorylation site. Cdk1 inhibitors block Bim phosphorylation in mitotically arrested cells, and siRNA silencing of Bim reduces sensitivity to Taxol-induced cell death. |
Co-immunoprecipitation, in vitro kinase assay with recombinant Cdk1/cyclin B1, Cdk1 inhibitors, siRNA, phospho-site mapping |
Cell cycle |
High |
22071694
|
| 2016 |
Usp27x, a deubiquitinase, binds BimEL upon ERK-dependent phosphorylation, reduces BimEL ubiquitination, stabilizes phosphorylated BimEL, and promotes apoptosis. Loss of endogenous Usp27x enhances Bim-degrading activity of oncogenic Raf. Usp27x acts as a tumor suppressor by counteracting ERK-mediated BimEL degradation. |
Co-immunoprecipitation, ubiquitination assay, overexpression and knockdown (siRNA) of Usp27x, apoptosis assays in melanoma/NSCLC cells |
EMBO reports |
Medium |
27013495
|
| 2021 |
Melatonin induces upregulation of the deubiquitinase OTUD1 via Sp1-mediated transcription. OTUD1 directly interacts with Bim, deubiquitinates it at lysine 3, and stabilizes Bim protein, leading to apoptosis. OTUD1 knockdown inhibited melatonin-induced Bim upregulation and apoptosis. |
Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, mutagenesis (K3 site), in vivo xenograft |
Journal of pineal research |
Medium |
34826170
|
| 2012 |
BCL2L11 (Bim) interacts with BECN1 (Beclin 1), and this interaction is facilitated by DYNLL1 (LC8). Bim recruits Beclin 1 to microtubules by bridging Beclin 1 and DYNLL1, thereby inhibiting autophagy. JNK-mediated phosphorylation of Bim (in starvation) abolishes the Bim-DYNLL1 interaction, releasing Beclin 1 and relieving autophagy inhibition. |
Co-immunoprecipitation, autophagy assays, JNK inhibition/phosphorylation analysis, siRNA knockdown |
Autophagy |
Medium |
23064249
|
| 2003 |
Bim is a critical mediator of anoikis in epithelial cells. Detachment-induced Bim expression requires loss of β1-integrin engagement, downregulation of EGFR, and inhibition of ERK signaling. RNAi-mediated knockdown of Bim inhibits anoikis. Overexpressed EGFR maintains ERK activation in suspension, blocking Bim expression and anoikis, demonstrating Bim functions as a sensor of integrin/growth factor signals to the ERK pathway. |
RNAi knockdown, EGFR overexpression, pharmacological ERK inhibition, suspension culture assays, siRNA |
Nature cell biology |
High |
12844146
|
| 2009 |
FOXO3 (FKHRL1) transcriptionally induces Bim expression. Bim induction by FOXO3 is essential for FOXO3-induced mitochondrial ROS production and apoptosis; Bim knockdown or Bcl-xL overexpression prevents FOXO3-mediated ROS overproduction. Tetracycline-controlled Bim expression impairs mitochondrial respiration and causes ROS production, suggesting Bim induces mitochondrial uncoupling. |
Inducible FOXO3 and Bim expression systems, siRNA knockdown, live-cell MitoTrackerRed microscopy, dominant-negative FOXO3 |
Journal of cell science |
Medium |
22349704
|
| 2010 |
BimS preferential splicing is controlled by B-RAFV600E signaling: inhibition of B-RAFV600E triggers upregulation of all Bim isoforms but preferentially promotes BimS splicing. The splicing factor SRp55 mediates this effect, as siRNA against SRp55 blocks BimS induction and apoptosis by PLX4720. |
RT-PCR isoform analysis, siRNA of SRp55, B-RAFV600E inhibitor (PLX4720), B-RAFV600E enforced expression |
Cell death & disease |
Medium |
21364673
|
| 2013 |
Zinc modulates Bim splicing by inhibiting SRSF6 (SRp55) activity, promoting elimination of exon 4 and preferential generation of the potent apoptotic isoform BimS. UV cross-linking assay showed SRSF6 directly binds the intronic region adjacent to exon 4; Zn2+ suppresses this binding and induces SRSF6 hyper-phosphorylation. Mutations in predicted SRSF6-binding sites abolished BimS generation from a Bim mini-gene. |
Bim mini-gene construct with deletion analysis, UV cross-linking/Western blot, mutagenesis, pharmacological inhibition (TG003) |
The FEBS journal |
High |
23648111
|
| 2009 |
EZH2 epigenetically suppresses Bim expression downstream of E2F1 to prevent E2F1-dependent apoptosis. RNAi-mediated depletion of EZH2 enhances E2F1-dependent Bim expression and promotes apoptosis, identifying a feedback circuit by which E2F1 induces EZH2 to restrain Bim-mediated apoptosis in cancer cells. |
RNAi knockdown of EZH2, chromatin immunoprecipitation (ChIP), Bim promoter analysis, apoptosis assays |
Cell death and differentiation |
Medium |
19893569
|
| 2016 |
EBV repressors EBNA3A and EBNA3C silence the BCL2L11 locus by recruiting the H3K27 methyltransferase EZH2 to a haematopoietic enhancer hub, inactivating enhancer-promoter interactions. Pharmacological reversal using an EZH2 inhibitor upregulates BCL2L11 and induces apoptosis. |
Chromatin conformation capture, ChIP, EZH2 inhibitor treatment, enhancer-promoter interaction mapping |
eLife |
Medium |
27490482
|
| 2016 |
The lncRNA Morrbid controls Bim (Bcl2l11) transcription in cis by promoting PRC2 complex enrichment at the Bcl2l11 promoter, maintaining it in a poised (repressed) state. Morrbid regulates allele-specific control of Bcl2l11 transcription in neutrophils, eosinophils, and classical monocytes in response to pro-survival cytokines. |
Chromatin immunoprecipitation (PRC2/H3K27me3 at Bcl2l11 promoter), allele-specific expression analysis, Morrbid knockout mouse model |
Nature |
High |
27525555
|
| 2010 |
IGF-1 suppresses Bim expression in multiple myeloma by three mechanisms: (1) Akt activation inactivates FoxO3a transcription factor to reduce Bim transcription; (2) MAPK activation promotes proteasomal degradation of BimEL; (3) epigenetic regulation of the Bim and FoxO3a promoters (reduced H3K9 acetylation and increased H3K9 dimethylation). RNAi knockdown of Bim protected cells from drug-induced death. |
RNAi knockdown, pharmacological inhibition, ChIP for histone modifications, Western blot, promoter methylation analysis |
Blood |
Medium |
20086250
|
| 2006 |
FKHRL1/FoxO3a transcriptionally induces Bim (and Noxa) expression in neuroblastoma, driving cytochrome c release and caspase-dependent apoptosis via the mitochondrial pathway. RNAi knockdown of Bim or Noxa individually decreases apoptosis, indicating both cooperate to mediate FKHRL1-induced cell death. Bcl-2 overexpression protects, but dominant-negative FADD does not, confirming the intrinsic pathway. |
4OH-tamoxifen-inducible FKHRL1 transgene, RNAi knockdown, dominant-negative FADD, Bcl-2 overexpression, caspase and cytochrome c assays |
Cell death and differentiation |
Medium |
16888645
|
| 2012 |
ASCIZ transcription factor activates DYNLL1 expression; DYNLL1 in turn modulates Bim-dependent apoptosis during B cell development. Loss of ASCIZ causes B cell lymphopenia that can be fully suppressed by deletion of Bim, placing ASCIZ→DYNLL1→Bim in a genetic epistasis pathway controlling B cell survival. |
Conditional KO mice, genetic epistasis (ASCIZ KO × Bim KO double mutant rescue), ectopic DYNLL1 expression |
The Journal of experimental medicine |
High |
22891272
|
| 2020 |
The CTS (carboxyl-terminal sequence) of Bim directly interacts with Bax and is required for Bax activation at physiological Bim concentrations; different CTS residues enable Bax activation versus membrane binding. BimL lacking the CTS (BimL-dCTS) inhibits Bcl-XL but cannot activate Bax, demonstrating mechanistically separable functions. |
Domain deletion and point mutants of Bim, mitochondrial permeabilization assays with isolated mitochondria, cell-based apoptosis assays |
eLife |
High |
31976859
|
| 2009 |
In living cells during UV-induced apoptosis, BimL directly binds Bcl-xL (not Bax), neutralizing Bcl-xL and releasing Bax for activation. No BimL–Bax interaction was detected by FRET in living cells or endogenous co-IP, supporting an indirect model of Bax activation by BimL. |
FRET in living cells, endogenous co-immunoprecipitation, RNAi knockdown of BimL |
FEBS letters |
Medium |
19427863
|
| 2018 |
Bim phosphorylation alters Mcl-1 stability and priming: constitutive Bim phosphorylation stabilizes Mcl-1, and phospho-mimetic or unphosphorylatable Bim mutations result in altered Mcl-1 stability and distinct binding profiles to anti-apoptotic proteins. This identifies Bim phosphorylation as a mechanism enforcing Mcl-1 dependence. |
Phospho-mimetic and non-phosphorylatable Bim mutants, co-immunoprecipitation, Mcl-1 stability assays |
The FEBS journal |
Medium |
29775995
|
| 2004 |
Raf/ERK signaling prevents transcriptional induction of BimEL and BimL upon matrix detachment and promotes phosphorylation and proteasomal degradation of the BimEL isoform, protecting epithelial cells from anoikis. |
Conditional Raf-ER activation, pharmacological MEK inhibition, Western blot for BimEL phosphorylation and degradation, suspension culture assays |
Oncogene |
Medium |
14676826
|
| 2008 |
Bim and Bmf are released from the cytoskeleton of cells infected with Neisseria gonorrhoeae in a JNK-1- and Rac-1-dependent manner. Loss of Bim and Bmf prevents Bak/Bax activation and caspase activation; apoptosis can be reconstituted in Bim-depleted cells by silencing Mcl-1, placing Bim upstream of Mcl-1 in the Ngo-induced apoptotic pathway. |
Focused siRNA miniscreen, subcellular fractionation, co-immunoprecipitation, caspase activation assay, epistasis by double knockdown |
PLoS pathogens |
Medium |
19300516
|
| 2021 |
Aurora B inhibition stabilizes BIM by reducing Ser87 phosphorylation, thereby enhancing BIM-mediated apoptosis. This provides a mechanistic basis for Aurora B inhibitor synergy with EGFR inhibitor osimertinib. EMT-induced osimertinib resistance activates ATR-CHK1-Aurora B signaling, which hyperphosphorylates BIM at Ser87. |
High-throughput drug screening, phospho-specific antibody detection of Ser87, Aurora B inhibitor treatment, BIM knockdown, EGFR/Aurora B combination studies in cells and mouse models |
Cancer cell |
Medium |
34388376
|
| 2012 |
Glucocorticoid-induced BIM transcription in leukemia cells requires the transcription factors c-Jun (acting at an AP-1 site ~2.7 kb upstream of the BIM transcription start site) and Runx2, both induced downstream of p38-MAPK. Dominant-negative c-Jun or Runx2 shRNA reduced Dex-induced BIM expression and apoptosis. |
Chromatin immunoprecipitation (c-Jun binding to Bim promoter), dominant-negative c-Jun, Runx2 shRNA, p38 inhibitor (SB203580), GC receptor antagonist (RU486) |
Cell death & disease |
Medium |
22825467
|
| 2020 |
In colorectal cancer, SMS depletion causes spermidine accumulation, which inhibits FOXO3a acetylation and promotes its nuclear translocation to transcriptionally induce Bim expression. MYC-driven miR-19a/b repress Bim protein production. Combined SMS and MYC inhibition dramatically induces Bim and apoptosis, with Bim silencing abolishing these effects. |
SMS genetic disruption, FOXO3a nuclear translocation assays, Bim promoter reporter, miR-19a/b overexpression/inhibition, siRNA Bim knockdown, xenograft tumor regression |
Nature communications |
Medium |
32591507
|
| 2004 |
BimEL functions downstream of Mcl-1 in myeloma cell survival: Bim is found strongly associated with Mcl-1 in viable myeloma cells, and this interaction is disrupted upon apoptosis induction coinciding with Mcl-1 downregulation. Bim/Bcl-2 interaction is not altered under apoptosis, implicating Mcl-1 as the dominant BimEL neutralizer in myeloma. |
Co-immunoprecipitation of endogenous Bim with Mcl-1 and Bcl-2, IL-6 withdrawal, apoptosis assays |
European journal of immunology |
Medium |
15459900
|