| 1996 |
LAPTM5 is a pentaspanning lysosomal transmembrane protein preferentially expressed in hematopoietic cells, localizing to lysosomes as determined by immunocytological and cell fractionation studies, and shows preliminary evidence of interaction with ubiquitin. |
Immunocytology, cell fractionation, cDNA cloning |
Genomics |
Medium |
8661146
|
| 2006 |
LAPTM5 trafficking from the Golgi to the lysosome requires its PY motifs (L/PPxY) binding to Nedd4 WW domains and its UIM motif binding ubiquitinated GGA3; Nedd4 binding to LAPTM5 (not LAPTM5 ubiquitination) is required for lysosomal targeting, and Nedd4 can also ubiquitinate GGA3. |
Co-immunoprecipitation, RNAi knockdown, site-directed mutagenesis of PY and UIM motifs, subcellular localization imaging |
The Journal of cell biology |
High |
17116753
|
| 2009 |
Accumulation of LAPTM5 protein induces non-apoptotic, caspase-independent lysosomal cell death characterized by lysosomal membrane permeabilization (LMP), disruption of autophagic flux, and accumulation of autophagic vacuoles and p62/SQSTM1 in neuroblastoma cells. |
In vitro overexpression/restoration of LAPTM5 expression, lysosomal membrane permeabilization assay, autophagy flux analysis |
PloS one |
Medium |
19787053
|
| 2011 |
The HECT-type E3 ubiquitin ligase ITCH directly binds the PPxY motif of LAPTM5 via its WW domains and ubiquitinates LAPTM5 via its HECT domain, promoting LAPTM5 protein degradation; ITCH knockdown stabilizes LAPTM5 and enhances LAPTM5-mediated cell death. |
Co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown, overexpression |
The Journal of biological chemistry |
High |
22009753
|
| 2012 |
LAPTM5 is required for proinflammatory cytokine secretion in macrophages via TLR ligands; LAPTM5-deficient macrophages show reduced NF-κB and MAPK activation downstream of TNF receptor and pattern recognition receptors, reduced RIP1 ubiquitination, and upregulated A20 (a deubiquitinase of RIP1). |
LAPTM5 knockout mice, RNAi knockdown in RAW264.7 cells, NF-κB/MAPK signaling assays, cytokine secretion assays, ubiquitination assays |
The Journal of biological chemistry |
High |
22733818
|
| 2012 |
LAPTM5 is a molecular partner of CD1e; the two proteins co-localize in trans-Golgi and late endosomal compartments, and their association increases under bafilomycin treatment, though LAPTM5 does not control CD1e ubiquitination or generation of soluble lysosomal CD1e. |
Co-immunoprecipitation, mass spectrometry identification, confocal co-localization |
PloS one |
Medium |
22880058
|
| 2014 |
LAPTM5 promotes lysosomal translocation of newly synthesized intracellular CD3ζ (targeting it from the Golgi) but not cell-surface CD3ζ from the mature TCR complex; this pathway is independent of TCR signaling-triggered tyrosine phosphorylation of CD3ζ and operates via a distinct genetic pathway from SLAP/c-Cbl-mediated degradation. |
Subcellular localization kinetics, Golgi-localizing CD3ζ mutants, tyrosine-to-phenylalanine CD3ζ mutants, genetic epistasis (double knockdown/mutant analysis) |
Immunology and cell biology |
High |
24638062
|
| 2017 |
Ectopic overexpression of LAPTM5 in HeLa cells localizes to lysosomes and induces apoptosis via Mcl-1 and Bid cleavage (by a lysosomal cathepsin-dependent pathway), Bak activation, mitochondrial membrane potential loss, and caspase-9/-8/-3 cascade; co-overexpression of Mcl-1 abrogates these events. |
GFP-LAPTM5 overexpression, flow cytometry, caspase activity assays, cathepsin inhibitor, mitochondrial membrane potential assay, western blotting |
PloS one |
Medium |
28464033
|
| 2019 |
LAPTM5 expression is transcriptionally activated by RUNX2, which directly binds the LAPTM5 promoter at position -1176 to -1171; LAPTM5 is involved in RANKL trafficking in osteoblastic cells, as LAPTM5 knockdown increases cytoplasmic and secreted RANKL and enhances osteoclast differentiation. |
Chromatin immunoprecipitation, dual-luciferase reporter assay, RUNX2 overexpression/silencing, RANKL trafficking assay, co-culture osteoclast differentiation assay |
Molecular medicine reports |
Medium |
31545469
|
| 2020 |
LAPTM5 suppresses CD40-mediated NF-κB activation in glioblastoma; LAPTM5 knockdown unleashes CD40-driven NF-κB signaling, leading to enhanced invasiveness, clonogenicity, and temozolomide resistance that is overcome by NF-κB inhibition. |
RNAi knockdown in glioma cell lines, expression arrays, NF-κB inhibition rescue, in vitro and in vivo invasion/clonogenicity assays |
Frontiers in oncology |
Medium |
32582531
|
| 2021 |
HIV-1 Vpr counteracts LAPTM5 restriction by triggering LAPTM5 degradation via DCAF1; LAPTM5 inhibits HIV-1 particle infectivity by transporting HIV-1 envelope glycoproteins to lysosomes for degradation; LAPTM5 silencing phenocopies Vpr in macrophages, and LAPTM5 re-expression in CD4+ T cells reconstitutes Vpr-dependent HIV-1 infection enhancement. |
Viral infection assays, LAPTM5 knockdown/overexpression, Vpr mutant analysis, DCAF1 dependency assays, envelope glycoprotein trafficking to lysosomes |
Nature communications |
High |
34140527
|
| 2022 |
BCR stimulation upregulates LAPTM5, which triggers immature B cell apoptosis through two mechanisms: (1) promoting BCR internalization, reducing SYK and ERK phosphorylation; and (2) targeting the E3 ubiquitin ligase WWP2 for lysosomal degradation, causing PTEN accumulation, suppressed AKT phosphorylation, increased FOXO1/p27Kip1/BIM expression. LAPTM5 deficiency exacerbates autoantibody production in vivo. |
BCR stimulation assays, LAPTM5 knockout mice, co-immunoprecipitation, western blotting for signaling pathway components, flow cytometry for BCR internalization, in vivo autoantibody measurement |
Proceedings of the National Academy of Sciences of the United States of America |
High |
36037365
|
| 2022 |
The lncRNA LCDR binds hnRNP K to stabilize LAPTM5 mRNA, maintaining lysosomal membrane integrity; knockdown of LCDR, hnRNP K, or LAPTM5 each promotes lysosomal membrane permeabilization and lysosomal cell death/apoptosis in lung cancer cells; LAPTM5 overexpression or cathepsin B inhibition partially rescues these effects. |
RNA pulldown, RIP-qPCR, siRNA knockdown, LAPTM5 overexpression rescue, lysosomal membrane permeabilization assay, in vivo xenograft |
Proceedings of the National Academy of Sciences of the United States of America |
High |
35091468
|
| 2023 |
c-Myc trans-represses LAPTM5 transcription by binding two E-boxes in the LAPTM5 promoter; Myc also trans-activates miR-17-3p, which binds 11 sites in LAPTM5 3'UTR to suppress LAPTM5 protein synthesis, further dampening tumor-suppressive LAPTM5 in B-lymphomas. |
Promoter binding assays (E-box mutagenesis), miRNA target site analysis, reporter assays, functional growth assays |
Annals of hematology |
Medium |
37713124
|
| 2025 |
LAPTM5 competes with LAMP1 for binding to the E3 ubiquitin ligase WWP2, thereby inhibiting LAMP1 ubiquitination and degradation to preserve lysosomal membrane stability and sustain autophagic flux, conferring cisplatin resistance in NSCLC; LAPTM5 knockdown increases lysosomal membrane permeability, releases cathepsin D, elevates ROS, and accelerates cell death. |
Co-immunoprecipitation, LAPTM5 knockdown, cathepsin D release assay, ROS measurement, autophagic flux assay, western blotting |
Cellular signalling |
Medium |
40280227
|
| 2025 |
LAPTM5 associates with STING, represses its K48- and K63-linked polyubiquitination, preventing both proteasomal and lysosomal degradation of STING, thereby maintaining STING protein stability; LAPTM5 knockdown reduces STING protein levels and downstream inflammatory signaling in macrophages. |
Co-immunoprecipitation, ubiquitination assays (K48/K63 linkage-specific), LAPTM5 knockdown, STING signaling assays |
Communications biology |
Medium |
41087666
|
| 2026 |
Ginkgetin inhibits K48-linked ubiquitination of LAPTM5 at residues K86 and K122 by targeting Ube3c (ubiquitin-protein ligase E3C), thereby increasing LAPTM5 protein levels, promoting autophagosome-lysosome fusion, and enabling autophagic degradation of TBK1 to suppress inflammatory signaling in macrophages during sepsis-induced acute lung injury. |
Co-immunoprecipitation, site-directed mutagenesis (K86/K122), biotin pulldown with mass spectrometry, DARTS, molecular docking, proteomics, autophagy flux assays |
Phytomedicine |
High |
41666511
|
| 2026 |
In AML, LAPTM5 promotes LAMP1 and LAMP2 transcription, supporting lysosomal biogenesis and autophagolysosome formation to sustain autophagic flux and reduce cytarabine-induced apoptosis; LAPTM5 knockdown impairs autophagolysosome formation and lysosomal biogenesis, sensitizing resistant AML cells to cytarabine in vitro and in vivo. |
scRNA-seq data analysis, LAPTM5 knockdown, autophagic flux assay, LAMP1/LAMP2 expression analysis, in vivo tumor model |
Cell death & disease |
Medium |
41912486
|
| 2025 |
WDFY4 interacts with LAPTM5 (validated by co-immunoprecipitation and immunofluorescence co-localization); WDFY4 interference inhibits LAPTM5 expression and activates the downstream CDC42/mTOR/4EBP1/SLC7A11 pathway, reducing ferroptosis; LAPTM5 overexpression rescues ferroptosis suppression caused by WDFY4 knockdown. |
Co-immunoprecipitation, immunofluorescence co-localization, WDFY4/LAPTM5 knockdown/overexpression, pathway analysis (CDC42/mTOR/4EBP1/SLC7A11), in vivo atherosclerosis model |
Journal of cellular and molecular medicine |
Medium |
40755163
|