| 2002 |
MAL2 is an essential component of the transcytotic machinery in polarized hepatoma HepG2 cells; it resides in rafts and a subapical compartment, and depletion of endogenous MAL2 drastically blocks transcytotic transport of polymeric immunoglobulin receptor and GPI-anchored protein CD59 to the apical membrane, causing their accumulation in perinuclear endosomes, without affecting internalization. |
Antisense-mediated depletion of endogenous MAL2, rescue with depletion-resistant exogenous MAL2, subcellular fractionation, confocal immunofluorescence, biochemical raft isolation |
The Journal of cell biology |
High |
12370246
|
| 2001 |
MAL2 was identified as a binding partner of TPD52-like proteins (TPD52L2 and related) via yeast two-hybrid screening, confirmed by GST pull-down assay showing specific binding of in vitro-translated MAL2 to GST-Tpd52; MAL2 is a four-transmembrane proteolipid of 19 kDa. |
Yeast two-hybrid screen, GST pull-down assay with in vitro translated MAL2 |
Genomics |
Medium |
11549320
|
| 2006 |
MAL2 is a highly dynamic protein that mediates GPI-anchored protein (CD59) transcytosis by redistributing into peripheral vesicular clusters that concentrate CD59 and transferrin receptor after basolateral endocytosis, then segregating transferrin receptor, fusing into a globular MAL2+ structure, and moving apically for cargo delivery; all steps are impaired upon MAL2 depletion. |
Live-cell imaging of GFP-MAL2 and transcytosing CD59, subcellular fractionation, MAL2 siRNA knockdown |
Traffic (Copenhagen, Denmark) |
High |
16445687
|
| 2010 |
INF2, an atypical formin with actin polymerization and depolymerization activities, is a direct binding partner of MAL2; MAL2-positive vesicular carriers associate with short actin filaments during transcytosis in an INF2-dependent process; Cdc42 binds INF2 in a GTP-loaded-dependent manner and, together with INF2, regulates MAL2 vesicle dynamics, apical transcytosis, and lumen formation in a sequential epistatic pathway: Cdc42 → INF2 → MAL2. |
Co-immunoprecipitation, yeast two-hybrid, live imaging of MAL2 vesicle dynamics, siRNA knockdown of INF2/Cdc42, organotypic MDCK lumen formation assay |
Developmental cell |
High |
20493814
|
| 2010 |
MAL2 is a bona fide membrane constituent of synaptic vesicles preferentially associated with VGLUT-1-containing (glutamatergic) nerve terminals, as established by quantitative proteomics, subcellular fractionation, and immunolocalization at light and electron microscopic level. |
Quantitative proteomics of isolated synaptic vesicle populations, subcellular fractionation, immunofluorescence, immunoelectron microscopy |
The Journal of neuroscience |
High |
20053882
|
| 2010 |
MAL2 selectively regulates polymeric IgA receptor (pIgA-R) delivery from the Golgi to the plasma membrane in hepatic WIF-B cells; overexpression of MAL2 in Clone 9 cells (lacking endogenous MAL2) enabled pIgA-R surface delivery (>9-fold enhancement) while MAL2 knockdown retained pIgA-R in the Golgi; this selectivity was not shared by other membrane proteins such as DPPIV. |
MAL2 knockdown/overexpression in WIF-B and Clone 9 cells, cycloheximide chase, immunofluorescence, surface delivery assay |
Traffic (Copenhagen, Denmark) |
High |
20444237
|
| 2011 |
MAL, but not MAL2, self-associates and forms higher-order cholesterol-dependent complexes with apical proteins, promoting formation of detergent-resistant membranes that recruit apical proteins; MAL2 lacks these raft-coalescence properties, consistent with distinct roles for MAL (direct route) and MAL2 (transcytotic/indirect route) in apical sorting. |
Biochemical raft isolation (detergent-resistant membrane fractionation), co-immunoprecipitation, sucrose gradient centrifugation, cholesterol depletion |
The Biochemical journal |
Medium |
21732912
|
| 2009 |
MUC1 (mucin 1) is a novel binding partner of MAL2 in breast carcinoma cells; interaction requires the first MAL2 transmembrane domain (whereas the N-terminal domain binds D52-like proteins); MAL2 expression in MCF-10A cells increased MUC1 detection in both Triton X-100-soluble and -insoluble fractions and at the cell surface. |
Yeast two-hybrid screen of breast carcinoma cDNA library, co-immunoprecipitation, deletion mapping, confocal microscopy, sucrose density gradient centrifugation |
BMC cell biology |
Medium |
19175940
|
| 2014 |
MAL2 interacts with STK16 (serine/threonine kinase 16), a constitutively active Golgi-associated kinase; MAL2 knockdown or expression of kinase-dead STK16 (E202A) impairs constitutive secretion of soluble cargo (albumin, haptoglobin) by diverting albumin to lysosomal degradation rather than blocking its synthesis or processing, indicating MAL2 and STK16 sort secretory cargo at the TGN. |
Split-ubiquitin yeast two-hybrid, co-immunoprecipitation, morphological colocalization, temperature-block and lysosome deacidification experiments, MAL2 knockdown |
The Biochemical journal |
Medium |
25084525
|
| 2021 |
MAL2 promotes endocytosis and degradation of antigen-loaded MHC-I complexes in breast cancer cells, thereby suppressing tumor antigen presentation; MAL2 directly interacts with MHC-I and endosome-associated RAB proteins; depletion of MAL2 enhances CD8+ T cell cytotoxicity against tumor cells and suppresses breast tumor growth in preclinical models. |
Co-immunoprecipitation (MAL2 with MHC-I and RAB proteins), MAL2 knockdown, endocytosis assays, in vivo tumor models with tumor-infiltrating CD8+ T cell analysis |
The Journal of clinical investigation |
High |
32990678
|
| 2021 |
MAL2 mediates formation of stable HER2 signaling complexes within lipid raft-rich membrane protrusions in breast cancer cells; MAL2-HER2 physical interaction in lipid rafts (shown by proximity ligation assay) promotes HER2 plasma membrane retention and enhanced HER2 signaling; HER2 co-localizes with Ezrin/NHERF1/PMCA2 in a complex that maintains low intracellular calcium near the plasma membrane; MAL2-HER2 interactions are enhanced in trastuzumab-resistant cells. |
Proximity ligation assay, super-resolution structured illumination microscopy, lipid raft isolation, calcium imaging, trastuzumab-resistant cell lines |
Cell reports |
Medium |
34965434
|
| 2020 |
MAL2 overexpression in hepatoma-derived cells promotes actin-based protrusion formation with reciprocal decrease in invadopodia, and decreases cell migration, invasion, and proliferation; a putative EVH1 recognition motif in MAL2 is required for these anti-oncogenic phenotypes, implicating MAL2 in actin remodeling via this motif. |
MAL2 overexpression in Clone 9 cells, MAL2 knockdown in Hep3B cells, mutational analysis of EVH1 motif, invasion/migration/proliferation assays, immunohistochemistry |
Cancers |
Medium |
32059473
|
| 2021 |
MAL2 interacts with IQGAP1 to increase ERK1/2 phosphorylation levels, thereby promoting pancreatic cancer cell progression. |
Co-immunoprecipitation (MAL2-IQGAP1 interaction), western blot for ERK1/2 phosphorylation, MAL2 overexpression |
Biochemical and biophysical research communications |
Low |
33780861
|
| 2009 |
In oligodendrocytic cell lines (Oli-neu, HOG), MAL2 accumulates after differentiation in a peri-centrosomal compartment that shares features of the apical recycling endosome/subapical compartment, including colocalization with Rab11a, sensitivity to nocodazole (microtubule disruption), and exclusion of transferrin, suggesting a role in sorting proteins/lipids for myelin assembly. |
Immunofluorescence, nocodazole treatment, transferrin internalization assay, subcellular fractionation in Oli-neu and HOG cells |
Experimental cell research |
Medium |
19683524
|
| 2011 |
PLP (proteolipid protein), the major myelin protein, co-localizes with GFP-MAL2 after internalization from the plasma membrane in HOG oligodendrocytic cells and co-immunoprecipitates with GFP-MAL2; ultrastructural studies show colocalization in vesicles and tubulovesicular structures, supporting a transcytotic model of PLP transport involving MAL2. |
Co-immunoprecipitation, confocal immunofluorescence, immunoelectron microscopy in HOG cells |
PloS one |
Medium |
21573057
|
| 2024 |
MAL2 directly interacts with EGFR (confirmed by molecular docking and Co-IP), stabilizing EGFR membrane localization and activating the PI3K/AKT/SREBP-1 axis to promote lipid accumulation in intrahepatic cholangiocarcinoma; MAL2 inhibition reduces EGFR membrane stability and sensitizes ICC organoids to cisplatin. |
Co-immunoprecipitation, molecular docking, scRNA-seq, transcriptomics, metabolomics, ICC organoid model, MAL2 knockdown |
Cell death & disease |
Medium |
38866777
|
| 2025 |
MAL2 and rab17 independently promote formation of actin- and cholesterol-dependent membrane protrusions in hepatoma cells; MAL2 selectively redistributes invadopodia proteins to protrusion tips (requiring the EVH1 recognition motif), decreasing matrix degradation; MAL2-rab17 interaction is GTP-dependent but EVH1-motif-independent; both MAL2 and rab17 redirect newly synthesized membrane protein trafficking from the Golgi to induced protrusions. |
MAL2 and rab17 expression in Clone 9 cells, mutational analysis (EVH1 motif, GTP-binding), co-immunoprecipitation, matrix degradation assay, Golgi-to-protrusion trafficking assay |
Molecular biology of the cell |
Medium |
39813085
|
| 2024 |
RAD21 transcriptionally activates MAL2 expression in endometrial cancer cells; MAL2 promotes immune evasion by suppressing MHC-I antigen presentation, reducing CD8+ T cell cytotoxicity; knockdown of MAL2 or RAD21 inhibits malignant behavior and restores MHC-I-mediated antigen presentation. |
MAL2 and RAD21 siRNA knockdown, MHC-I surface expression assay, CD8+ T cell cytotoxicity assay, in vivo tumor growth, western blot |
Cytotechnology |
Low |
38933871
|
| 2003 |
In human thyroid epithelial cells, MAL2 exclusively resides in raft membranes (biochemical fractionation) and predominantly localizes in a subapical endosome compartment positive for Rab11a (confocal immunofluorescence), consistent with its role as a machinery component for the transcytotic route to the apical surface. |
Raft membrane biochemical fractionation, confocal immunofluorescence with Rab11a colocalization in primary thyrocyte cultures |
Endocrinology |
Medium |
14576188
|
| 2023 |
MAL2 interacts with β-catenin in breast cancer cells (confirmed by Co-IP and immunofluorescence colocalization); MAL2 silencing reduces β-catenin and c-Myc expression, while β-catenin agonist (SKL2001) partially rescues c-Myc downregulation and EMT inhibition caused by MAL2 knockdown, placing MAL2 upstream of the β-catenin/c-Myc axis. |
Co-immunoprecipitation, immunofluorescence colocalization, β-catenin inhibitor/agonist treatment, western blot, in vivo metastasis model |
Cancer cell international |
Medium |
37480012
|