| 1993 |
MCL1 was originally identified as a gene induced early during phorbol ester-induced differentiation of the ML-1 human myeloid leukemia cell line along the monocyte/macrophage pathway, with sequence similarity to BCL2, establishing it as a founding member of the BCL-2 family associated with programming of differentiation and maintenance of cell viability. |
cDNA cloning, Northern blot, sequence analysis |
Proceedings of the National Academy of Sciences of the United States of America |
High |
7682708
|
| 2005 |
Bak is sequestered in healthy cells specifically by Mcl-1 and Bcl-xL (but not Bcl-2, Bcl-w, or A1), requiring the Bak BH3 domain; BH3-only proteins such as Noxa can bind Mcl-1, displace Bak, and promote Mcl-1 degradation, but Bak-mediated death also requires neutralization of Bcl-xL. |
Co-immunoprecipitation, genetic rescue/epistasis, cell-free apoptosis assays |
Genes & development |
High |
15901672
|
| 2005 |
BH3 domain peptides derived from Noxa selectively bind Mcl-1 (and A1) but not other prosurvival proteins, whereas Bad binds Bcl-2/Bcl-xL/Bcl-w but not Mcl-1, defining selective interaction specificity among BCL-2 family members; Bad and Noxa cooperate to kill cells by jointly neutralizing Mcl-1 and Bcl-2/Bcl-xL. |
Fluorescence polarization binding assays, Co-IP, cell death assays |
Molecular cell |
High |
15694340
|
| 2005 |
BH3 peptides from Bid and Bim directly activate Bax, while other BH3 peptides (including those selective for Mcl-1) function as derepressors by relieving Mcl-1- or Bcl-xL-mediated inhibition of Bax, demonstrating that Mcl-1 acts upstream of Bax at mitochondrial membranes. |
Reconstituted membrane-permeabilization assay, BH3 peptide competition |
Molecular cell |
High |
15721256
|
| 2005 |
TCTP (translationally controlled tumor protein) directly interacts with Mcl-1 and stabilizes it by interfering with ubiquitin-dependent proteasomal degradation; overexpression of TCTP augments Mcl-1 protein stability and antiapoptotic activity, while TCTP knockdown destabilizes Mcl-1; the TCTP-binding-defective Mcl-1 mutant K257V is more rapidly degraded and has compromised antiapoptotic function. |
Co-IP, RNAi knockdown, site-directed mutagenesis, cycloheximide chase, apoptosis assays |
Molecular and cellular biology |
High |
15798198
|
| 2005 |
Mule (Mcl-1 ubiquitin ligase E3), a 482 kDa HECT-domain E3 ubiquitin ligase containing a BH3-like domain, directly binds Mcl-1 via its BH3 domain, polyubiquitinates Mcl-1 at five lysine residues, and is required for DNA damage-induced Mcl-1 degradation and apoptosis; RNAi depletion of Mule stabilizes Mcl-1 and attenuates DNA damage-induced apoptosis. |
Biochemical fractionation, in vitro ubiquitination assay, RNAi, Co-IP |
Cell |
High |
15989957
|
| 2004 |
Mitochondrially localized p53 interacts with the proapoptotic protein Bak, causing Bak oligomerization and cytochrome c release; formation of the p53-Bak complex coincides with dissociation of the Bak-Mcl-1 complex, indicating that Mcl-1 normally sequesters Bak and that p53 can displace Mcl-1 to activate apoptosis. |
Co-IP from mitochondrial fractions, cell-free cytochrome c release assay |
Nature cell biology |
High |
15077116
|
| 2006 |
Glycogen synthase kinase-3 (GSK-3) phosphorylates MCL-1 at S159, promoting its ubiquitination and proteasomal degradation upon IL-3 withdrawal; AKT inactivates GSK-3 to sustain MCL-1 levels and prevent apoptosis; the phosphorylation-site mutant MCL-1(S159A) shows enhanced stability and greater protection from apoptosis. |
In vitro kinase assay, site-directed mutagenesis, pharmacological inhibitors, cycloheximide chase, ubiquitination assay |
Molecular cell |
High |
16543145
|
| 2006 |
MCL-1 inhibits mitochondrial Ca2+ signals induced by Ca2+ agonists or apoptotic stimuli (without affecting ER Ca2+ store size or IP3R expression), providing evidence that Mcl-1 acts directly at mitochondria to suppress Ca2+ uptake as a mechanism of apoptosis inhibition. |
Overexpression and siRNA knockdown with mitochondrial Ca2+ imaging |
The Journal of biological chemistry |
Medium |
16027162
|
| 2006 |
BH3 profiling revealed that MCL-1 (along with BCL-2, BCL-XL, MCL-1, BFL-1, BCL-w) each bears a distinct pattern of interaction with BH3-domain peptides; cellular dependence on MCL-1 for survival correlates with sequestration of activator BH3-only proteins (BID or BIM) by MCL-1 at mitochondria. |
BH3 profiling (peptide-based mitochondrial permeabilization assay), Co-IP |
Cancer cell |
High |
16697956
|
| 2006 |
TRAIL-activated caspase-8 or caspase-3 directly cleaves Mcl-1 at the mitochondrial outer membrane, freeing Bim (normally sequestered by Mcl-1) to mediate Bax-dependent apoptosis and release of cytochrome c, Smac, and HtrA2; this defines a novel TRAIL/caspase-8/Mcl-1/Bim communication between extrinsic and intrinsic apoptotic pathways. |
RNAi knockdown, Co-IP, mitochondrial membrane potential measurement, caspase activity assays |
The Journal of biological chemistry |
High |
16478725
|
| 2003 |
UV irradiation blocks Mcl-1 protein synthesis and causes rapid proteasomal degradation of the existing Mcl-1 pool; elimination of Mcl-1 is required upstream of Bcl-xL translocation, Bax translocation, cytochrome c release, and caspase activation in UV-induced apoptosis. |
Genetic epistasis (Mcl-1 depletion), subcellular fractionation, proteasome inhibitor rescue, cell-free apoptosis assay |
Genes & development |
High |
12783855
|
| 2009 |
USP9X (a deubiquitinase) binds MCL1 and removes Lys48-linked polyubiquitin chains that mark MCL1 for proteasomal degradation, thereby stabilizing MCL1 and promoting cell survival; USP9X knockdown increases MCL1 polyubiquitination and turnover, and sensitizes cells to the BH3 mimetic ABT-737. |
Co-IP, in vitro deubiquitination assay, RNAi, cycloheximide chase, xenograft |
Nature |
High |
20023629
|
| 2007 |
In multiple myeloma cells treated with bortezomib, Mcl-1 is cleaved (in addition to accumulating as full-length protein); Noxa is strongly induced, Noxa-Mcl-1 complexes increase, Mcl-1/Bak complexes are disrupted, and Bim is displaced from Mcl-1 by Noxa, liberating Bim to activate Bax/Bak-dependent apoptosis. |
Co-IP, siRNA knockdown, immunoblotting, caspase activation assays |
Cancer research |
High |
17545623
|
| 2010 |
MCL-1 can be degraded independently of ubiquitination: an MCL-1 mutant lacking all lysine residues (MCL-1(KR), incapable of ubiquitination) is still eliminated at the same rate as wild-type MCL-1 under basal and stressed conditions, and unmodified in vitro-translated MCL-1 can be degraded by the 20S proteasome in a cell-free system. |
Ubiquitin-deficient MCL-1 mutant (KR), cell-free 20S proteasome assay, E1 inhibition, primary lymphocyte experiments |
Molecular and cellular biology |
High |
20385764
|
| 2011 |
SCF(FBW7) E3 ubiquitin ligase ubiquitylates MCL-1 in a GSK3-phosphorylation-dependent manner, targeting it for proteasomal destruction; loss of FBW7 in T-ALL leads to MCL-1 overexpression and resistance to the BCL-2 antagonist ABT-737, which is restored by FBW7 reconstitution or MCL-1 depletion. |
In vitro ubiquitination assay, Co-IP, genetic rescue, pharmacological inhibition, shRNA |
Nature |
High |
21368833
|
| 2012 |
Trim17 is identified as an E3 ubiquitin ligase for Mcl-1 in neurons: Trim17 co-immunoprecipitates with Mcl-1, ubiquitinates Mcl-1 in vitro, and promotes phosphorylation-dependent (GSK3-mediated) proteasomal degradation of Mcl-1 to initiate neuronal apoptosis; knockdown of Trim17 reduces Mcl-1 ubiquitination and degradation. |
Co-IP, in vitro ubiquitination assay, GSK3 inhibition, site-directed mutagenesis, primary neuron cultures, RNAi |
Cell death and differentiation |
High |
22976837
|
| 2013 |
Cardiac-specific ablation of Mcl-1 causes lethal dilated cardiomyopathy with loss of contractility, abnormal mitochondrial ultrastructure, and defective mitochondrial respiration; genetic co-deletion of Bax and Bak largely rescues lethality and cardiac function but does not fully restore mitochondrial morphology or respiration, indicating that MCL-1 has both antiapoptotic and a distinct mitochondrial function in cardiomyocytes. |
Conditional knockout mice, genetic epistasis (Bax/Bak co-deletion), electron microscopy, mitochondrial respiration assays, echocardiography |
Genes & development |
High |
23788622
|
| 2012 |
MCL-1 promotes maintenance of normal mitochondrial morphology and energy production through localization to the mitochondrial matrix, while its antiapoptotic function is restricted to the outer mitochondrial membrane (OMM); these two functions depend on separate mitochondrial sublocalizations. |
Subcellular fractionation, mitochondrial import assays, functional domain analysis, conditional knockout |
Trends in cell biology |
High |
23026029
|
| 2014 |
Ku70, a DNA double-strand break repair protein, functions as a deubiquitinase for Mcl-1: Ku70 directly binds Mcl-1 via its C-terminus (aa 536-609), co-localizes with Mcl-1 in mitochondria/ER/nucleus, and purified Ku70 directly removes K48-linked polyubiquitin chains from Mcl-1 in vitro, stabilizing Mcl-1 and suppressing apoptosis. |
Knockout MEFs, Co-IP, subcellular fractionation, in vitro deubiquitination with purified proteins, domain mapping, xenograft |
Cell death and differentiation |
High |
24769731
|
| 2006 |
Conditional knockout of Mcl-1 in myeloid precursors causes neutropenia due to apoptotic death during granulocyte differentiation; this phenotype is rescued by co-deletion of Bax and Bak (but not Bim and Puma deletion or cytokine treatment), placing MCL-1's neutrophil survival function upstream of the Bax/Bak apoptotic pathway. In macrophages, MCL-1 loss increases apoptosis sensitivity during bacterial phagocytosis in a Bim-dependent manner. |
Lineage-specific conditional knockout mice, genetic epistasis, flow cytometry, bacterial phagocytosis assay |
Blood |
High |
19064728
|
| 2006 |
Conditional deletion of Mcl-1 in neutrophils results in a ~2-3 fold higher apoptotic rate and severe defect in neutrophil survival in blood, spleen, and bone marrow; macrophage survival is normal and is associated with compensatory upregulation of Bcl-2 and Bcl-xL. |
Conditional knockout mice, flow cytometry apoptosis assays, immunoblotting |
Blood |
High |
17062731
|
| 2007 |
Mcl-1 and Bim proteins mutually protect each other from ubiquitin-proteasome degradation through their direct interaction; disruption of the Mcl-1/Bim complex (by shRNA knockdown of either) leads to increased polyubiquitination and proteasomal degradation of the unliganded partner protein. |
shRNA stable knockdown, co-IP, ubiquitination analysis, immunoblotting |
Biochemical and biophysical research communications |
Medium |
17681275
|
| 2016 |
MCL-1 is allosterically inhibited by covalent small-molecule modification of cysteine C286, a site distant from the BH3-binding groove; C286 modification impairs BH3-binding capacity and suppression of BAX, a phenomenon recapitulated by C286W mutagenesis in vitro and in mouse cells, establishing an allosteric mechanism for disrupting MCL-1's antiapoptotic activity. |
Covalent chemical modification, site-directed mutagenesis (C286W), BH3 binding assays, BAX suppression assay, NMR/structural analysis |
Nature structural & molecular biology |
High |
27159560
|
| 2016 |
Mcl-1 acts as a functional switch in DNA double-strand break (DSB) repair pathway choice: Mcl-1 expression peaks in S/G2 phase, it directly interacts with the Ku heterodimer (via BH1 and BH3 domains) to inhibit Ku-mediated NHEJ, and promotes Mre11-dependent DNA resection and HR; Mcl-1 depletion reduces HR and enhances NHEJ. |
Co-IP, cell cycle analysis, domain mutagenesis (BH1, BH3), HR/NHEJ reporter assays, small molecule (MI-223) targeting BH1, in vivo xenograft |
The Journal of clinical investigation |
High |
29227281
|
| 2018 |
APC/C (anaphase-promoting complex/cyclosome) mediates proteolytic destruction of Mcl-1 during prolonged mitotic arrest via a D-box motif; an IR (isoleucine-arginine) C-terminal tail converts Mcl-1 from a Cdc20-dependent (checkpoint-controlled) substrate to one degraded independently of checkpoint strength, providing a slow, steady apoptotic timer during mitosis that distinguishes prolonged arrest from normal mitosis. |
Live-cell imaging, D-box and IR tail mutagenesis, siRNA depletion of APC/C components, proteasome inhibition |
The EMBO journal |
High |
29987118
|
| 2016 |
Mcl-1 overexpression extends the time from mitotic entry to mitotic exit in taxol-arrested cells, while Mcl-1 inhibition accelerates slippage; Mcl-1 competes with Cyclin B1 for binding to the proteasomal degradation machinery, slowing Cyclin B1 degradation and thereby influencing the slippage-versus-death decision during mitotic arrest. |
Overexpression/inhibition of Mcl-1, live-cell imaging, competition assays |
Oncotarget |
Medium |
26769847
|
| 2007 |
Anoikis initiation requires Mcl-1 degradation via a GSK-3β-dependent proteasomal pathway upon matrix detachment, combined with transcriptional upregulation of Bim; Mcl-1 degradation in the presence of Bim is sufficient to induce anoikis, and oncogenic signaling (PI3K/Akt, MAPK) blocks this by suppressing Mcl-1 degradation and Bim induction. |
GSK-3β inhibition, proteasome inhibitors, RNAi knockdown, in vivo metastasis assays |
Cancer research |
High |
18006817
|
| 2017 |
Hsp90 inhibition promotes GSK3β-dependent phosphorylation of Mcl-1, which then binds FBW7 and undergoes ubiquitination and proteasomal degradation; FBW7 mutations block this pathway and confer resistance to Hsp90 inhibitors; knock-in of a phosphorylation-defective Mcl-1 abrogates degradation and confers resistance in vitro and in vivo. |
Knock-in mutagenesis, Co-IP, ubiquitination assay, shRNA, xenograft models |
Molecular cancer therapeutics |
High |
28619760
|
| 2017 |
FBXO4 is an E3 ubiquitin ligase that directly interacts with Mcl-1 and promotes its ubiquitination and proteasomal degradation; FBXO4 knockdown dramatically elevates Mcl-1 protein levels and increases cell survival and drug resistance, while FBXO4 overexpression has the opposite effect. |
Co-IP, in vitro ubiquitination assay, RNAi, overexpression, immunoblotting in patient samples |
Cancer gene therapy |
Medium |
28776569
|
| 2002 |
Mcl-1 antisense oligonucleotides (but not Bcl-2 or Bcl-xL ASOs) trigger apoptosis in all tested human myeloma cell lines and primary myeloma cells, through disruption of mitochondrial membrane potential and caspase-3 activation, establishing Mcl-1 as the essential survival protein in multiple myeloma. |
Antisense oligonucleotides, flow cytometry (apoptosis, ΔΨm), caspase-3 activation assay |
Blood |
High |
12070027
|
| 2012 |
Genetic removal of Mcl-1 (but not Bcl-xL, Bcl-2, or Bcl-w) is required for death of transformed AML cells and cures disease in AML-afflicted mice; enforced expression of selective inhibitors of Mcl-1 triggers death of human AML cells. |
Conditional knockout mice, shRNA, selective BH3 peptide expression, in vivo AML model |
Genes & development |
High |
22279045
|
| 2013 |
In fludarabine-sensitive leukemic cells, MCL-1 degradation following drug treatment frees both BIM (proapoptotic) and BECN1 (autophagy initiator) from MCL-1 sequestration, triggering cell-death-associated autophagy; in fludarabine-resistant cells, low BIM and persistent BECN1 sequestration by MCL-1 prevents both apoptosis and BECN1-dependent autophagy. |
Co-IP (MCL-1/BIM, MCL-1/BECN1), siRNA, shRNA knockdowns, cell death assays in sensitive and resistant cell lines |
Cell death & disease |
Medium |
23681223
|
| 2011 |
SRSF1 (and SRSF5) RNA-binding proteins regulate alternative splicing of Mcl-1 pre-mRNA; knockdown of SRSF1 shifts splicing between the anti-apoptotic Mcl-1L and pro-apoptotic Mcl-1S isoforms in a cell-context-dependent manner, and also affects Mcl-1 protein stability and translation. |
RNAi (siRNA knockdown), RT-PCR splicing assay, immunoblotting |
PloS one |
Medium |
23284704
|
| 2018 |
hnRNP F, H1, and K bind specific sites in the Mcl-1 pre-mRNA and regulate alternative splicing toward Mcl-1L; siRNA-mediated knockdown of these hnRNPs switches splicing toward the proapoptotic Mcl-1S isoform and activates the mitochondrial cell death pathway, with triple knockdown producing up to 30-fold changes in Mcl-1S levels. |
siRNA knockdown, RNA immunoprecipitation, minigene construct splicing assay, flow cytometry |
RNA biology |
Medium |
30468106
|
| 2015 |
Mcl-1 involvement in mitochondrial dynamics: increased Mcl-1S/L ratio (via splice-switching antisense oligonucleotides) induces mitochondrial hyperpolarization, increased mitochondrial Ca2+ accumulation, and Drp1-dependent mitochondrial hyperfusion, linking the Mcl-1 isoform balance to regulation of the mitochondrial fusion/fission machinery. |
Splice-switching antisense oligonucleotides, mitochondrial morphology imaging, Ca2+ measurement, Drp1 knockdown |
Molecular biology of the cell |
Medium |
26538029
|
| 2017 |
MYC and MCL-1 cooperate to maintain chemotherapy-resistant cancer stem cells (CSCs) in TNBC by increasing mitochondrial oxidative phosphorylation (mtOXPHOS) and ROS generation; a mutant MCL-1 that cannot localize to mitochondria reduces mtOXPHOS and ROS without affecting MCL-1's antiapoptotic function, demonstrating that MCL-1's mitochondrial role in bioenergetics is mechanistically distinct from its apoptosis-suppressing role. |
MCL-1 localization mutant, mitochondrial respiration assay, ROS measurement, CSC assays, in vivo tumor initiation |
Cell metabolism |
High |
28978427
|
| 2021 |
USP13 (a deubiquitinase) binds, deubiquitinates, and stabilizes Mcl-1 in cervical cancer cells; USP13 depletion or inhibition reduces Mcl-1 protein levels, inhibits cell proliferation, and sensitizes cells to ABT-263; USP13 and Mcl-1 protein levels positively correlate in cervical cancer tissue. |
Co-IP, deubiquitination assay, siRNA knockdown, pharmacological USP13 inhibition, IHC correlation |
Oncogene |
Medium |
33627786
|
| 2022 |
Skp2 stabilizes Mcl-1 by competing with and blocking FBW7-mediated Mcl-1 ubiquitination and degradation; Skp2 depletion (via CRISPR-Cas9 KO) reduces Mcl-1 protein, sensitizes colorectal cancer cells to irradiation, and Skp2-Mcl-1 interaction was confirmed by co-IP. |
CRISPR-Cas9 knockout, Co-IP, ubiquitination analysis, in vitro and in vivo irradiation experiments |
Cell death & disease |
Medium |
35301297
|
| 2022 |
TRAF4 stabilizes MCL-1 through an indirect mechanism: IR promotes TRAF4-Akt interaction leading to Akt K63-ubiquitination and activation; activated Akt phosphorylates and inhibits GSK3β, reducing MCL-1 S159 phosphorylation, which disrupts the MCL-1 interaction with JOSD1 deubiquitinase, preventing MCL-1 ubiquitination and degradation. |
Co-IP, ubiquitination analysis, TRAF4 knockout, GSK3β phosphorylation assays, site-directed mutagenesis, xenograft |
Cell death & disease |
Medium |
36535926
|
| 2022 |
Mcl-1 suppresses starvation-induced non-selective autophagy but promotes selective mitophagy of depolarized mitochondria via its LC3-interacting regions (LIR motifs) and interaction with the mitophagy receptor Bnip3; the interaction between Mcl-1 and Bnip3 increases under mitochondrial stress, and mutation of LIR sites significantly reduces Mcl-1-mediated mitochondrial clearance. |
Cardiac-specific Mcl-1 overexpression, LIR motif mutagenesis, Co-IP with Bnip3, autophagy flux assays, mitophagy reporter |
Cells |
Medium |
35563775
|
| 2021 |
Erythroid-specific Mcl1 deletion causes embryonic lethality from severe anemia; MCL-1 is required only during early definitive erythropoiesis; its function is antiapoptotic (co-deletion of Bax/Bak rescues the phenotype), and ectopic BCL2 expression can compensate for Mcl1 loss, indicating functional redundancy. |
Erythroid-specific conditional knockout, genetic epistasis (Bax/Bak co-deletion), ectopic BCL2 expression rescue |
Blood |
High |
33512417
|
| 2018 |
Bim phosphorylation alters its binding to Mcl-1: constitutive Bim phosphorylation stabilizes Mcl-1 and primes it for death signals; phosphomimetic and phospho-deficient Bim mutations result in altered Mcl-1 stability and distinct antiapoptotic protein binding patterns, suggesting Bim phosphorylation regulates Mcl-1 dependence. |
Phosphomimetic/phospho-deficient Bim mutagenesis, Co-IP, cycloheximide chase stability assays |
The FEBS journal |
Medium |
29775995
|
| 2014 |
STAT3 and MCL-1 are direct interacting partners during embryo implantation (confirmed by MALDI-TOF, far-western analysis, colocalization, and co-transfection); estrogen and progesterone regulate the interaction; in breast cancer cells overexpressing both proteins, the STAT3-MCL-1 association modulates normal anti-apoptotic activity of MCL-1 toward a pro-apoptotic outcome and decreases cellular invasion. |
MALDI-TOF, far-western analysis, co-IP, colocalization, co-transfection |
Journal of cell science |
Low |
24481815
|
| 2011 |
A novel reverse BH3 (rBH3) motif was identified by phage display screening using Mcl-1's BH3-binding groove; rBH3 peptides bind the BH3 groove of Mcl-1 selectively over Bcl-xL as confirmed by NMR, fluorescence polarization, and alanine scanning, and proteins containing this motif represent previously unknown Mcl-1 binding partners. |
Phage display, NMR spectroscopy, fluorescence polarization displacement assay, alanine scanning |
The Journal of biological chemistry |
Medium |
21953453
|