{"gene":"LAMP2","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2000,"finding":"LAMP2A acts as the receptor in the lysosomal membrane for substrate proteins of chaperone-mediated autophagy (CMA). Four positively-charged amino acids uniquely present in the cytosolic tail of LAMP2A are required for substrate protein binding. LAMP2A levels in the lysosomal membrane directly correlate with CMA rates; other LAMP2 isoforms do not show this correlation and substrate proteins do not bind them.","method":"Isoform-specific antibodies, substrate binding assays, site-directed mutagenesis of cytosolic tail, quantitative correlation of LAMP2A levels with CMA rates in rat liver and fibroblasts under physiological and pathological conditions","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of active site (cytosolic tail), direct binding assays, isoform-specific reagents, multiple conditions tested in single rigorous study","pmids":["11082038"],"is_preprint":false},{"year":1997,"finding":"The steady-state subcellular distribution of LAMP-2 splice variants (LAMP-2A, -2B, -2C) is determined largely by the COOH-terminal amino acid residue of their cytosolic tails. LAMP-2C shows predominantly lysosomal distribution, whereas LAMP-2A and LAMP-2B show higher cell-surface levels due to differences in targeting signal recognition, not saturation of trafficking machinery.","method":"Chimeric constructs (avian LAMP-1 lumenal domain fused to alternatively spliced LAMP-2 domains), site-directed mutagenesis of COOH-terminal residue, subcellular distribution analysis by microscopy and fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis combined with chimeric protein approach, multiple isoforms compared in same study","pmids":["9166415"],"is_preprint":false},{"year":1999,"finding":"Asparagine-linked oligosaccharides protect LAMP-2 (and LAMP-1) from intracellular proteolytic degradation within lysosomes. Endoglycosidase H-mediated removal of Asn-linked glycans from fully folded LAMP-2 in living cells resulted in its rapid degradation. Depletion of LAMP-1 and LAMP-2 delayed transport of endocytosed material to dense lysosomes but did not measurably affect endosomal/lysosomal pH, osmotic stability, density, or degradation rate of internalized BSA.","method":"Endoglycosidase H treatment of living cells (in-cell deglycosylation), metabolic labeling, cell fractionation, pH and osmotic stability assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct enzymatic manipulation in living cells, multiple orthogonal functional readouts in single rigorous study","pmids":["10521503"],"is_preprint":false},{"year":2002,"finding":"LAMP-2 deficiency in hepatocytes prolongs the half-life of both early and late autophagic vacuoles, impairs trafficking of some lysosomal enzymes (including cathepsin D processing and retention), and causes impaired recycling of the 46-kDa mannose 6-phosphate receptor from endosomes to the Golgi, with the receptor accumulating in autophagic vacuoles and having a shorter half-life.","method":"Quantitative electron microscopy of LAMP-2 knockout mouse hepatocytes, endocytic tracer studies, enzyme activity measurements, metabolic labeling with immunoprecipitation of cathepsin D, steady-state protein level analysis by Western blot, immunofluorescence of mannose 6-phosphate receptors","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse model with multiple orthogonal methods (EM, tracer, enzyme assay, metabolic labeling, western blot), replicated across readouts","pmids":["12221139"],"is_preprint":false},{"year":2011,"finding":"LAMP-2 (through its luminal domain, particularly the membrane-proximal half) plays a critical role in endosomal/lysosomal cholesterol export. LAMP-1/LAMP-2 double-deficient cells show a defect in cholesterol esterification due to impaired export from late endosomes/lysosomes. Overexpression of any LAMP-2 isoform (but not LAMP-1) rescues cholesterol accumulation caused by U18666A or LAMP deficiency. This function is distinct from CMA.","method":"LAMP-1/2 double-knockout cell studies, LDL receptor and uptake assays, cholesterol esterification assays, overexpression rescue experiments with LAMP-2 isoforms and luminal domain truncations, liver cholesterol measurements in LAMP-2 KO mice","journal":"Journal of cellular and molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout and rescue experiments, multiple isoforms and domain truncations tested, in vitro and in vivo corroboration","pmids":["19929948"],"is_preprint":false},{"year":2016,"finding":"LAMP-2 is required for the incorporation of syntaxin-17 (STX17) into autophagosomes; in LAMP-2-deficient cells STX17 is absent from autophagosomes, which prevents autophagosome-lysosome fusion. Complementation with LAMP-2A rescues both STX17 autophagosomal localization and autophagosome-lysosome fusion. VAMP8 expression and localization are unchanged in LAMP-2-deficient cells.","method":"LAMP-2 and LAMP-1/2 double-deficient mouse embryonic fibroblasts, tandem fluorescent-tagged LC3 (mRFP-GFP-LC3) fusion assay, LAMP-2A complementation, immunofluorescence for STX17 and VAMP8","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with rescue, mechanistic pathway placement using tandem reporter and multiple protein localizations","pmids":["27628032"],"is_preprint":false},{"year":1998,"finding":"Newly synthesized LAMP-1 and LAMP-2 are sorted at the trans-Golgi network (TGN) into transport vesicles that are distinct from clathrin-coated vesicles containing mannose 6-phosphate receptors and gamma-adaptin. LAMP vesicle generation requires ATP, cytosol, and is temperature-dependent and brefeldin A-sensitive but wortmannin-insensitive, unlike MPR/gamma-adaptin vesicles.","method":"In vitro TGN vesicle budding assay with tritiated CMP-sialic acid labeling, Nycodenz gradient fractionation, wortmannin and brefeldin A pharmacological inhibition, in vivo sorting assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of vesicle budding with pharmacological dissection, corroborated by in vivo sorting experiments","pmids":["9668075"],"is_preprint":false},{"year":2007,"finding":"LAMP-1 and LAMP-2 together are required for phagosome maturation and bacterial killing. LAMP-1/2 double-deficient cells fail to kill engulfed Neisseria gonorrhoeae; maturation is arrested prior to Rab7 acquisition, preventing RILP recruitment and dynein/dynactin-mediated centripetal phagosome displacement. Single LAMP-1 or LAMP-2 deficiency alone does not prevent microbicidal activity.","method":"LAMP-1, LAMP-2, and double-knockout mouse embryonic fibroblasts; siRNA knockdown in human epithelial cells; bacterial survival assays; immunofluorescence for Rab7, RILP; microscopy of phagosome positioning","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO (single and double) with mechanistic pathway placement (Rab7/RILP/dynein axis), confirmed by siRNA in human cells","pmids":["17506821"],"is_preprint":false},{"year":2016,"finding":"LAMP-1 and LAMP-2 adopt the same β-prism fold as DC-LAMP in their subdomains. The N-domain of LAMP-1 is necessary for multimeric assembly, whereas the N-domain of LAMP-2 is repressive for multimeric assembly, indicating distinct assembly modes for LAMP-1 and LAMP-2.","method":"Crystal structure analysis (β-prism fold determination), N-domain truncation constructs, immunoprecipitation assembly assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — structural determination and truncation immunoprecipitation in single study; limited mechanistic follow-up beyond assembly","pmids":["27663661"],"is_preprint":false},{"year":2012,"finding":"LAMP-1 and LAMP-2B are the most abundant interaction partners of the lysosomal polypeptide transporter TAPL (ABCB9). The interaction interface maps to the four-transmembrane N-terminal domain (TMD0) of TAPL. LAMP proteins stabilize TAPL on the limiting lysosomal membrane and prevent its sorting to intraluminal vesicles; in LAMP-deficient cells, TAPL half-life is reduced fivefold due to increased lysosomal degradation. The interaction does not affect TAPL subcellular localization or peptide transport activity.","method":"Proteomic pull-down/co-immunoprecipitation, domain mapping with TMD0 truncations, LAMP-deficient cell lines for half-life measurements (pulse-chase), peptide transport assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with domain mapping, functional consequence (stability) validated in KO cells, multiple orthogonal methods in single study","pmids":["22641697"],"is_preprint":false},{"year":1996,"finding":"LAMP-2 (CD107b) at the cell surface of activated peripheral blood mononuclear cells mediates adhesion to vascular endothelium, possibly through interaction with endothelial selectins. Cell surface expression increases rapidly upon PHA stimulation and is confined primarily to CD56+ and CD3+ cells.","method":"Flow cytometry for cell-surface LAMP-2 expression, fluorescence-based adhesion assay with blocking antibodies, pharmacological inhibition (colchicine, cycloheximide)","journal":"Cellular immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional adhesion assay with antibody blocking, consistent with prior tumor cell data; single lab, no receptor-level molecular mechanism confirmed","pmids":["8660832"],"is_preprint":false},{"year":1993,"finding":"LAMP-2 cycles between lysosomes and the plasma membrane along the endocytic pathway in cultured rat hepatocytes. Surface-bound anti-LAMP-2 Fab'-HRP conjugates are taken up and delivered to lysosomes in a saturable, cycloheximide-insensitive manner, demonstrating constitutive recycling of LAMP-2 between the cell surface and lysosomes.","method":"HRP-conjugated Fab' fragments against LAMP-2, cell fractionation on Percoll gradients, kinetic analysis of uptake, cycloheximide treatment","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct quantitative trafficking assay with defined kinetics; single lab","pmids":["8276775"],"is_preprint":false},{"year":1996,"finding":"A significant fraction (~45%) of newly synthesized LAMP-2 is transported from the trans-Golgi to early endosomes and then delivered to dense lysosomes via perinuclear late endosomes, a route distinct from the predominantly intracellular (late-endosome-direct) route taken by LAMP-1.","method":"Biosynthetic transport kinetics in rat hepatocytes by pulse-chase with subcellular fractionation, quantitative trafficking assays","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative kinetic fractionation, direct comparison with LAMP-1 route; single lab","pmids":["9010755"],"is_preprint":false},{"year":1998,"finding":"The extent of polylactosamine glycosylation of LAMP-2 is determined by its Golgi residence time, not by glycosyltransferase expression levels. Longer transit time through the Golgi (as found in 1-day vs 3-day MDCK cells) results in greater polylactosamine modification of LAMP-2.","method":"Endoglycosidase treatment, nocodazole and 20°C block experiments, glycosyltransferase activity assays, MDCK epithelial polarization model","journal":"Glycobiology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — enzymatic assays and pharmacological Golgi retention manipulation; single lab with multiple orthogonal approaches","pmids":["9675228"],"is_preprint":false},{"year":2017,"finding":"LAMP-2 (CD107b) functions as an endocytic receptor on the surface of human monocyte-derived dendritic cells (MoDC). After ligation, LAMP-2 is internalized and traffics transiently to the MHC class II loading compartment. Antigen conjugated to anti-LAMP-2 antibody is diverted away from MHC II surface presentation and instead concentrated in exosomes, which are a uniquely effective source of antigen for T cell proliferation.","method":"Antibody ligation and internalization assays, live-cell imaging of trafficking to MHC II compartments, flow cytometry for surface HLA-DR, T cell proliferation assays (direct and transwell), extracellular vesicle isolation and characterization by Western blot","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays in single study; single lab, no molecular receptor-ligand reconstitution","pmids":["28607115"],"is_preprint":false},{"year":2019,"finding":"LAMP-2 on the host cell surface is the receptor for Trypanosoma cruzi metacyclic trypomastigote surface molecule gp82. Antibody to LAMP-2 (but not LAMP-1) significantly reduced T. cruzi invasion; LAMP-2-depleted cells were more resistant to invasion; and co-immunoprecipitation demonstrated that gp82 binds to LAMP-2 but not LAMP-1.","method":"Antibody blocking assays, siRNA-mediated LAMP-1 and LAMP-2 knockdown in HeLa cells, co-immunoprecipitation with protein A/G magnetic beads cross-linked with anti-LAMP-1 or anti-LAMP-2 antibodies, dose-response binding assays with recombinant gp82","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, antibody blocking, and knockdown with functional readout; single lab","pmids":["30609224"],"is_preprint":false},{"year":2020,"finding":"Galectin-9 is enriched in lysosomes of gut epithelial cells and binds predominantly to LAMP2 in an N-glycan-dependent manner, specifically at Asn175 of LAMP2. Loss of galectin-9 N-glycan-binding capability depletes galectin-9 from lysosomes and causes defective autophagy, leading to ER stress in autophagy-active cells (Paneth cells and acinar cells) and subsequent colitis and pancreatic disorders.","method":"Co-immunoprecipitation, glycan-binding mutant galectin-9 constructs, LAMP2 Asn175 site-specific mutagenesis, immunofluorescence co-localization, autophagy flux assays, mouse models of colitis and pancreatic disease","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-specific mutagenesis of both binding partners, Co-IP, functional rescue, in vivo phenotypes; multiple orthogonal methods","pmids":["32855403"],"is_preprint":false},{"year":2016,"finding":"FUT1-mediated α1,2-fucosylation of LAMP-2 (and LAMP-1) regulates lysosomal positioning. FUT1 knockdown causes a shift from peripheral to perinuclear lysosomal distribution and is correlated with increased autophagic flux, decreased mTORC1 activity, and enhanced autophagosome-lysosome fusion.","method":"FUT1 knockdown, MALDI-TOF glycan analysis, nanoLC-MS3 glycopeptide analysis, immunofluorescence for LAMP-1/2 localization, mTORC1 activity assays, autophagic flux measurements","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — glycan mass spectrometry and functional knockdown with multiple readouts; single lab","pmids":["27560716"],"is_preprint":false},{"year":2022,"finding":"LAMP2 is required for proper autophagy in cortical thymic epithelial cells (cTECs) and for MHC II antigen processing. Genetic inactivation of Lamp2 in thymic stromal cells specifically impairs CD4 T cell development (positive selection) without misdirecting MHC II-restricted cells to the CD8 lineage. This is mechanistically linked to altered MHC II processing and reduced CD4 TCR repertoire diversity.","method":"Thymic stroma-specific Lamp2 knockout mice, flow cytometry of T cell subsets, MHC II processing assays, TCR repertoire sequencing","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with defined developmental phenotype and mechanistic pathway placement; single lab","pmids":["35535798"],"is_preprint":false},{"year":2023,"finding":"CREG1 protects LAMP2 from proteasomal degradation by inhibiting FBXO27, an E3 ubiquitin ligase that targets LAMP2 for degradation. LAMP2 overexpression reverses the inhibition of autophagy caused by CREG1 knockdown in palmitate-stimulated cardiomyocytes, placing LAMP2 downstream of the CREG1-FBXO27 axis in the regulation of autophagic flux in the heart.","method":"Co-immunoprecipitation, CREG1 overexpression/knockdown, LAMP2 overexpression rescue, Western blot for FBXO27 and LAMP2 levels, diabetic cardiomyopathy mouse models","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying FBXO27 as E3 ligase for LAMP2 with rescue experiment; single lab","pmids":["37658156"],"is_preprint":false},{"year":2015,"finding":"LAMP-2 deficiency in pancreatic acinar cells leads to impaired autophagic flux (accumulation of autophagosomes, failure of autolysosome formation), which progresses to trypsinogen activation, macrophage-driven inflammation, and acinar cell death. Pancreatitis models show LAMP degradation mediated by cathepsin B cleavage near the boundary between luminal and transmembrane domains.","method":"LAMP-2 knockout mice (spontaneous pancreatitis model), mass spectrometry to identify cathepsin B cleavage sites, electron microscopy, trypsinogen activation assays, amylase secretion assays","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic KO model with defined disease phenotype, mass spectrometry identification of cleavage site, multiple functional readouts","pmids":["26693174"],"is_preprint":false},{"year":2015,"finding":"LAMP-2 deficiency in retinal pigment epithelium (RPE) cells retards phagocytic degradation of photoreceptor outer segments, compromises lysosomal degradation, and increases exocytosis, leading to age-dependent accumulation of basal laminar deposits resembling early AMD pathology. LAMP2 expression declines with age in RPE cells.","method":"Lamp2 knockout mice, electron microscopy, fundus autofluorescence imaging, immunofluorescence for APOE/APOA1/clusterin/vitronectin, phagocytosis and lysosomal degradation assays in RPE cells, analysis of AMD patient eyes","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse model with multiple orthogonal methods and human AMD tissue corroboration","pmids":["31699817"],"is_preprint":false},{"year":2018,"finding":"LAMP-2 deficiency in vascular smooth muscle cells (VSMC) causes accumulation of autophagic vacuoles (impaired mitophagy), phenotypic switching from contractile (α-SMA+) to synthetic (vimentin+) phenotype, mitochondrial fragmentation, enhanced mitochondrial respiration, and overproduction of ROS. In vivo, LAMP-2-deficient mice develop medial arterial thickening with luminal stenosis due to VSMC proliferation.","method":"LAMP-2 KO mice (9–24 months), ultrastructural analysis, immunofluorescence for vimentin/α-SMA, LAMP2 siRNA knockdown in human brain VSMC, mitochondrial respiration assays, ROS measurements","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse in vivo phenotype with cell-level mechanism confirmed by siRNA; single lab","pmids":["29463847"],"is_preprint":false},{"year":2020,"finding":"In ischemic cardiomyocytes, LAMP2 overexpression alleviates autophagic flux blockade by promoting the trafficking of cathepsin B and cathepsin D to lysosomes, thereby preventing lysosomal membrane permeabilization (LMP) and cardiomyocyte death.","method":"Adenoviral LAMP2 overexpression in OGD-treated cardiomyocytes, cathepsin trafficking assays, LMP assays, cell viability assays, drug/gene-based autophagic flux modulation","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — overexpression with mechanistic cathepsin trafficking readout; single lab, in vitro model","pmids":["32117965"],"is_preprint":false},{"year":1995,"finding":"LAMP-1 and LAMP-2 are present in the membranes of specific granules and secretory vesicles in human neutrophils, but are absent from azurophil granules. During phagocytosis, both LAMP proteins become concentrated around ingested particles and appear on the cell surface upon mobilization of secretory organelles.","method":"Subcellular fractionation, Western blotting, immunostaining, phagocytosis assays in human neutrophil granulocytes","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct fractionation with functional phagocytosis readout; single study","pmids":["7487911"],"is_preprint":false},{"year":1996,"finding":"LAMP-2 is present in platelet dense granule membranes in addition to lysosomal granule membranes. Upon thrombin stimulation, LAMP-2 shows biphasic surface expression: early expression associated with dense granule release and late expression associated with lysosomal granule release. In Hermansky-Pudlak syndrome platelets lacking dense granules, only the late lysosome-associated LAMP-2 surface expression is observed.","method":"Immunoblotting of dense granule preparations, flow cytometry of thrombin-stimulated platelets, HPS patient platelets as natural dense-granule-deficient control, immunoelectron microscopy with anti-serotonin antibody to identify dense granules","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — fractionation, EM co-localization, and natural disease model; single lab","pmids":["8743190"],"is_preprint":false}],"current_model":"LAMP2 is a major lysosomal membrane glycoprotein whose luminal N-glycans protect it from proteolytic degradation; its LAMP-2A isoform serves as the CMA receptor (requiring four unique cytosolic tail basic residues for substrate binding), while all isoforms participate in autophagosome-lysosome fusion by ensuring STX17 recruitment to autophagosomes, in endosomal cholesterol export via the luminal domain, in phagosome maturation (Rab7 acquisition and centripetal transport), in lysosomal enzyme trafficking, and in stabilizing partner proteins such as TAPL; its isoform-specific cytosolic tails determine differential targeting between lysosomes and the cell surface, and at the cell surface LAMP-2 mediates leukocyte adhesion to endothelium, acts as an endocytic receptor on dendritic cells routing antigen into immunogenic exosomes, and serves as the host-cell receptor for T. cruzi gp82."},"narrative":{"mechanistic_narrative":"LAMP2 is a major lysosomal membrane glycoprotein that integrates autophagy, organelle maturation, and membrane trafficking, with isoform-specific cytosolic tails directing distinct cellular roles [PMID:11082038, PMID:9166415]. Its luminal Asn-linked oligosaccharides protect the protein from intralysosomal proteolysis, and loss of LAMP-1/LAMP-2 delays delivery of endocytosed material to dense lysosomes [PMID:10521503]. The LAMP-2A isoform serves as the receptor for chaperone-mediated autophagy, binding substrate proteins through four positively-charged residues unique to its cytosolic tail, with lysosomal LAMP-2A levels setting CMA rates [PMID:11082038]; the COOH-terminal residue of each splice variant's cytosolic tail determines its steady-state partition between lysosomes and the cell surface [PMID:9166415]. Beyond CMA, LAMP2 is broadly required for macroautophagy: it is needed to incorporate syntaxin-17 into autophagosomes, a prerequisite for autophagosome–lysosome fusion [PMID:27628032], and its deficiency in vivo prolongs autophagic vacuole half-life and disrupts lysosomal enzyme trafficking, including cathepsin D processing and mannose-6-phosphate receptor recycling [PMID:12221139]. LAMP2 also drives phagosome maturation through Rab7/RILP-dependent centripetal transport [PMID:17506821], mediates endosomal/lysosomal cholesterol export via its luminal membrane-proximal domain [PMID:19929948], and stabilizes partner membrane proteins such as the lysosomal peptide transporter TAPL/ABCB9 against degradation [PMID:22641697]. The protein's stability and function are further tuned by glycan-dependent interactions, including galectin-9 binding at Asn175 that supports autophagy [PMID:32855403], and by a CREG1–FBXO27 axis controlling its proteasomal turnover [PMID:37658156]. Loss of LAMP2 produces tissue-specific autophagy and lysosomal degradation failures in pancreatic acinar cells [PMID:26693174], retinal pigment epithelium [PMID:31699817], vascular smooth muscle [PMID:29463847], and thymic epithelium where it shapes MHC II-restricted CD4 T cell selection [PMID:35535798]. At the cell surface LAMP-2 acts in leukocyte adhesion to endothelium [PMID:8660832], as an endocytic receptor on dendritic cells routing antigen into immunogenic exosomes [PMID:28607115], and as the host-cell receptor for Trypanosoma cruzi gp82 [PMID:30609224].","teleology":[{"year":1993,"claim":"Established that LAMP-2 is not a static lysosomal resident but constitutively cycles between the cell surface and lysosomes, framing its dual intracellular/surface biology.","evidence":"HRP-conjugated anti-LAMP-2 Fab' uptake kinetics with Percoll fractionation in rat hepatocytes","pmids":["8276775"],"confidence":"Medium","gaps":["Molecular machinery controlling recycling not defined","Single lab"]},{"year":1996,"claim":"Showed LAMP-2 reaches lysosomes by a route distinct from LAMP-1, revealing isoform/family-specific trafficking itineraries.","evidence":"Pulse-chase biosynthetic transport kinetics with subcellular fractionation in rat hepatocytes","pmids":["9010755"],"confidence":"Medium","gaps":["Sorting determinants for the early-endosome route not mapped"]},{"year":1997,"claim":"Resolved why LAMP-2 splice variants differ in localization, attributing surface-vs-lysosome partition to the COOH-terminal cytosolic residue rather than machinery saturation.","evidence":"Chimeric LAMP-1/LAMP-2 constructs and C-terminal site-directed mutagenesis with fractionation/microscopy","pmids":["9166415"],"confidence":"High","gaps":["Adaptor proteins reading each tail signal not identified"]},{"year":1998,"claim":"Demonstrated that LAMP proteins are sorted at the TGN into a vesicle class distinct from MPR/clathrin carriers, defining a separate biosynthetic export pathway.","evidence":"In vitro TGN budding assay with CMP-sialic acid labeling and brefeldin A/wortmannin dissection","pmids":["9668075"],"confidence":"High","gaps":["Coat/adaptor components of the LAMP vesicle not identified"]},{"year":1999,"claim":"Defined a protective function for LAMP-2 luminal glycans and showed LAMP depletion slows endocytic delivery to dense lysosomes without altering lumenal pH.","evidence":"In-cell endoglycosidase H deglycosylation, metabolic labeling, and fractionation/pH assays","pmids":["10521503"],"confidence":"High","gaps":["Identity of the proteases degrading deglycosylated LAMP-2 not established"]},{"year":2000,"claim":"Identified LAMP-2A as the CMA receptor and pinpointed four cytosolic-tail basic residues as the substrate-binding determinant, linking receptor abundance to pathway flux.","evidence":"Isoform-specific antibodies, substrate binding assays, and tail mutagenesis correlated with CMA rates in rat liver/fibroblasts","pmids":["11082038"],"confidence":"High","gaps":["Structural basis of substrate recognition not resolved","Other CMA components not addressed here"]},{"year":2002,"claim":"Showed via knockout mice that LAMP-2 loss disrupts autophagic vacuole turnover, lysosomal enzyme processing, and MPR recycling, placing LAMP-2 at multiple trafficking nodes.","evidence":"Quantitative EM, endocytic tracers, cathepsin D metabolic labeling, and MPR immunofluorescence in LAMP-2 KO hepatocytes","pmids":["12221139"],"confidence":"High","gaps":["Direct molecular interactions driving each defect not dissected"]},{"year":2007,"claim":"Placed LAMP-1/LAMP-2 upstream of Rab7 in phagosome maturation, explaining a microbicidal defect through arrested RILP/dynein-mediated centripetal transport.","evidence":"Single and double LAMP knockout MEFs and human siRNA with bacterial killing and Rab7/RILP localization assays","pmids":["17506821"],"confidence":"High","gaps":["How LAMPs promote Rab7 acquisition mechanistically is unknown","Functional redundancy between LAMP-1 and LAMP-2"]},{"year":2011,"claim":"Assigned a CMA-independent role for the LAMP-2 luminal domain in endosomal/lysosomal cholesterol export.","evidence":"LAMP-1/2 double-KO cells, isoform and luminal-truncation rescue, cholesterol esterification assays, and KO mouse liver cholesterol","pmids":["19929948"],"confidence":"High","gaps":["Direct cholesterol-handling partner of the luminal domain not identified"]},{"year":2012,"claim":"Identified LAMP-2B as a stabilizing partner of the lysosomal transporter TAPL/ABCB9, showing LAMP proteins protect membrane partners from intraluminal degradation.","evidence":"Proteomic Co-IP, TMD0 domain mapping, and pulse-chase half-life in LAMP-deficient cells","pmids":["22641697"],"confidence":"High","gaps":["Whether other lysosomal transporters are similarly stabilized unknown"]},{"year":2016,"claim":"Established that LAMP-2 is required for syntaxin-17 incorporation into autophagosomes, mechanistically explaining its role in autophagosome–lysosome fusion.","evidence":"LAMP-2/double-KO MEFs, tandem mRFP-GFP-LC3 reporter, and LAMP-2A rescue with STX17/VAMP8 localization","pmids":["27628032"],"confidence":"High","gaps":["How LAMP-2 directs STX17 to autophagosomes (direct vs indirect) not resolved"]},{"year":2016,"claim":"Provided structural insight into the LAMP β-prism fold and revealed opposite N-domain effects on multimerization for LAMP-1 versus LAMP-2.","evidence":"Crystal structure determination and N-domain truncation immunoprecipitation assembly assays","pmids":["27663661"],"confidence":"Medium","gaps":["Functional consequence of differential assembly not established","Single structural study"]},{"year":2020,"claim":"Showed glycan-dependent galectin-9 binding at LAMP2 Asn175 sustains lysosomal autophagy and protects autophagy-active epithelia from ER stress.","evidence":"Co-IP, galectin-9 glycan-binding mutants, LAMP2 Asn175 mutagenesis, autophagy flux, and colitis/pancreatic mouse models","pmids":["32855403"],"confidence":"High","gaps":["Downstream lysosomal events of galectin-9 recruitment not mapped"]},{"year":2023,"claim":"Defined a CREG1–FBXO27 axis controlling LAMP2 stability, identifying FBXO27 as an E3 ligase targeting LAMP2 for proteasomal degradation.","evidence":"Co-IP, CREG1 gain/loss, LAMP2 overexpression rescue, and diabetic cardiomyopathy mouse models","pmids":["37658156"],"confidence":"Medium","gaps":["Ubiquitination site(s) on LAMP2 not mapped","Single lab"]},{"year":2019,"claim":"Identified surface LAMP-2 as the host receptor for T. cruzi gp82, extending LAMP-2 surface biology to pathogen entry.","evidence":"Antibody blocking, LAMP-1/2 siRNA, and gp82 Co-IP/binding assays in HeLa cells","pmids":["30609224"],"confidence":"Medium","gaps":["Receptor-ligand interaction not reconstituted with purified components","Single lab"]},{"year":null,"claim":"How LAMP-2's distinct molecular activities (CMA receptor, STX17 incorporation, cholesterol export, partner stabilization) are coordinated by isoform/glycan state on a single lysosomal membrane remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural/biochemical model linking the luminal and cytosolic functions","Adaptors and direct binding partners for most trafficking roles unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[0]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[15]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[14]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[10]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,10,11,14,15]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3,12]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[24,25]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0,3,5,16,20]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,6,7,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,14,18]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[4]}],"complexes":[],"partners":["STX17","ABCB9","LGALS9","FBXO27","CREG1","LAMP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P13473","full_name":"Lysosome-associated membrane glycoprotein 2","aliases":["CD107 antigen-like family member B","LGP-96"],"length_aa":410,"mass_kda":45.0,"function":"Lysosomal membrane glycoprotein which plays an important role in lysosome biogenesis, lysosomal pH regulation and autophagy (PubMed:11082038, PubMed:18644871, PubMed:24880125, PubMed:27628032, PubMed:36586411, PubMed:37390818, PubMed:8662539). Acts as an important regulator of lysosomal lumen pH regulation by acting as a direct inhibitor of the proton channel TMEM175, facilitating lysosomal acidification for optimal hydrolase activity (PubMed:37390818). Plays an important role in chaperone-mediated autophagy, a process that mediates lysosomal degradation of proteins in response to various stresses and as part of the normal turnover of proteins with a long biological half-live (PubMed:11082038, PubMed:18644871, PubMed:24880125, PubMed:27628032, PubMed:36586411, PubMed:8662539). Functions by binding target proteins, such as GAPDH, GPX4, NLRP3 and MLLT11, and targeting them for lysosomal degradation (PubMed:11082038, PubMed:18644871, PubMed:24880125, PubMed:36586411, PubMed:8662539). In the chaperone-mediated autophagy, acts downstream of chaperones, such as HSPA8/HSC70, which recognize and bind substrate proteins and mediate their recruitment to lysosomes, where target proteins bind LAMP2 (PubMed:36586411). 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of the tandem duplication of LAMP2 exons 4 and 5 demonstrates the limits of Danon disease cellular and molecular diagnostics.","date":"2013","source":"Journal of inherited metabolic disease","url":"https://pubmed.ncbi.nlm.nih.gov/23716275","citation_count":17,"is_preprint":false},{"pmid":"29399154","id":"PMC_29399154","title":"Lysosome-associated membrane protein 2 (LAMP-2) expression induced by miR-194-5p downregulation contributes to sunitinib resistance in human renal cell carcinoma cells.","date":"2017","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/29399154","citation_count":17,"is_preprint":false},{"pmid":"2032724","id":"PMC_2032724","title":"The nucleotide sequence of a CpG island demonstrates the presence of the first exon of the gene encoding the human lysosomal membrane protein lamp2 and assigns the gene to 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Four positively-charged amino acids uniquely present in the cytosolic tail of LAMP2A are required for substrate protein binding. LAMP2A levels in the lysosomal membrane directly correlate with CMA rates; other LAMP2 isoforms do not show this correlation and substrate proteins do not bind them.\",\n      \"method\": \"Isoform-specific antibodies, substrate binding assays, site-directed mutagenesis of cytosolic tail, quantitative correlation of LAMP2A levels with CMA rates in rat liver and fibroblasts under physiological and pathological conditions\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of active site (cytosolic tail), direct binding assays, isoform-specific reagents, multiple conditions tested in single rigorous study\",\n      \"pmids\": [\"11082038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The steady-state subcellular distribution of LAMP-2 splice variants (LAMP-2A, -2B, -2C) is determined largely by the COOH-terminal amino acid residue of their cytosolic tails. LAMP-2C shows predominantly lysosomal distribution, whereas LAMP-2A and LAMP-2B show higher cell-surface levels due to differences in targeting signal recognition, not saturation of trafficking machinery.\",\n      \"method\": \"Chimeric constructs (avian LAMP-1 lumenal domain fused to alternatively spliced LAMP-2 domains), site-directed mutagenesis of COOH-terminal residue, subcellular distribution analysis by microscopy and fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis combined with chimeric protein approach, multiple isoforms compared in same study\",\n      \"pmids\": [\"9166415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Asparagine-linked oligosaccharides protect LAMP-2 (and LAMP-1) from intracellular proteolytic degradation within lysosomes. Endoglycosidase H-mediated removal of Asn-linked glycans from fully folded LAMP-2 in living cells resulted in its rapid degradation. Depletion of LAMP-1 and LAMP-2 delayed transport of endocytosed material to dense lysosomes but did not measurably affect endosomal/lysosomal pH, osmotic stability, density, or degradation rate of internalized BSA.\",\n      \"method\": \"Endoglycosidase H treatment of living cells (in-cell deglycosylation), metabolic labeling, cell fractionation, pH and osmotic stability assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct enzymatic manipulation in living cells, multiple orthogonal functional readouts in single rigorous study\",\n      \"pmids\": [\"10521503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"LAMP-2 deficiency in hepatocytes prolongs the half-life of both early and late autophagic vacuoles, impairs trafficking of some lysosomal enzymes (including cathepsin D processing and retention), and causes impaired recycling of the 46-kDa mannose 6-phosphate receptor from endosomes to the Golgi, with the receptor accumulating in autophagic vacuoles and having a shorter half-life.\",\n      \"method\": \"Quantitative electron microscopy of LAMP-2 knockout mouse hepatocytes, endocytic tracer studies, enzyme activity measurements, metabolic labeling with immunoprecipitation of cathepsin D, steady-state protein level analysis by Western blot, immunofluorescence of mannose 6-phosphate receptors\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse model with multiple orthogonal methods (EM, tracer, enzyme assay, metabolic labeling, western blot), replicated across readouts\",\n      \"pmids\": [\"12221139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LAMP-2 (through its luminal domain, particularly the membrane-proximal half) plays a critical role in endosomal/lysosomal cholesterol export. LAMP-1/LAMP-2 double-deficient cells show a defect in cholesterol esterification due to impaired export from late endosomes/lysosomes. Overexpression of any LAMP-2 isoform (but not LAMP-1) rescues cholesterol accumulation caused by U18666A or LAMP deficiency. This function is distinct from CMA.\",\n      \"method\": \"LAMP-1/2 double-knockout cell studies, LDL receptor and uptake assays, cholesterol esterification assays, overexpression rescue experiments with LAMP-2 isoforms and luminal domain truncations, liver cholesterol measurements in LAMP-2 KO mice\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout and rescue experiments, multiple isoforms and domain truncations tested, in vitro and in vivo corroboration\",\n      \"pmids\": [\"19929948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LAMP-2 is required for the incorporation of syntaxin-17 (STX17) into autophagosomes; in LAMP-2-deficient cells STX17 is absent from autophagosomes, which prevents autophagosome-lysosome fusion. Complementation with LAMP-2A rescues both STX17 autophagosomal localization and autophagosome-lysosome fusion. VAMP8 expression and localization are unchanged in LAMP-2-deficient cells.\",\n      \"method\": \"LAMP-2 and LAMP-1/2 double-deficient mouse embryonic fibroblasts, tandem fluorescent-tagged LC3 (mRFP-GFP-LC3) fusion assay, LAMP-2A complementation, immunofluorescence for STX17 and VAMP8\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with rescue, mechanistic pathway placement using tandem reporter and multiple protein localizations\",\n      \"pmids\": [\"27628032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Newly synthesized LAMP-1 and LAMP-2 are sorted at the trans-Golgi network (TGN) into transport vesicles that are distinct from clathrin-coated vesicles containing mannose 6-phosphate receptors and gamma-adaptin. LAMP vesicle generation requires ATP, cytosol, and is temperature-dependent and brefeldin A-sensitive but wortmannin-insensitive, unlike MPR/gamma-adaptin vesicles.\",\n      \"method\": \"In vitro TGN vesicle budding assay with tritiated CMP-sialic acid labeling, Nycodenz gradient fractionation, wortmannin and brefeldin A pharmacological inhibition, in vivo sorting assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of vesicle budding with pharmacological dissection, corroborated by in vivo sorting experiments\",\n      \"pmids\": [\"9668075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LAMP-1 and LAMP-2 together are required for phagosome maturation and bacterial killing. LAMP-1/2 double-deficient cells fail to kill engulfed Neisseria gonorrhoeae; maturation is arrested prior to Rab7 acquisition, preventing RILP recruitment and dynein/dynactin-mediated centripetal phagosome displacement. Single LAMP-1 or LAMP-2 deficiency alone does not prevent microbicidal activity.\",\n      \"method\": \"LAMP-1, LAMP-2, and double-knockout mouse embryonic fibroblasts; siRNA knockdown in human epithelial cells; bacterial survival assays; immunofluorescence for Rab7, RILP; microscopy of phagosome positioning\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO (single and double) with mechanistic pathway placement (Rab7/RILP/dynein axis), confirmed by siRNA in human cells\",\n      \"pmids\": [\"17506821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LAMP-1 and LAMP-2 adopt the same β-prism fold as DC-LAMP in their subdomains. The N-domain of LAMP-1 is necessary for multimeric assembly, whereas the N-domain of LAMP-2 is repressive for multimeric assembly, indicating distinct assembly modes for LAMP-1 and LAMP-2.\",\n      \"method\": \"Crystal structure analysis (β-prism fold determination), N-domain truncation constructs, immunoprecipitation assembly assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — structural determination and truncation immunoprecipitation in single study; limited mechanistic follow-up beyond assembly\",\n      \"pmids\": [\"27663661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LAMP-1 and LAMP-2B are the most abundant interaction partners of the lysosomal polypeptide transporter TAPL (ABCB9). The interaction interface maps to the four-transmembrane N-terminal domain (TMD0) of TAPL. LAMP proteins stabilize TAPL on the limiting lysosomal membrane and prevent its sorting to intraluminal vesicles; in LAMP-deficient cells, TAPL half-life is reduced fivefold due to increased lysosomal degradation. The interaction does not affect TAPL subcellular localization or peptide transport activity.\",\n      \"method\": \"Proteomic pull-down/co-immunoprecipitation, domain mapping with TMD0 truncations, LAMP-deficient cell lines for half-life measurements (pulse-chase), peptide transport assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with domain mapping, functional consequence (stability) validated in KO cells, multiple orthogonal methods in single study\",\n      \"pmids\": [\"22641697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"LAMP-2 (CD107b) at the cell surface of activated peripheral blood mononuclear cells mediates adhesion to vascular endothelium, possibly through interaction with endothelial selectins. Cell surface expression increases rapidly upon PHA stimulation and is confined primarily to CD56+ and CD3+ cells.\",\n      \"method\": \"Flow cytometry for cell-surface LAMP-2 expression, fluorescence-based adhesion assay with blocking antibodies, pharmacological inhibition (colchicine, cycloheximide)\",\n      \"journal\": \"Cellular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional adhesion assay with antibody blocking, consistent with prior tumor cell data; single lab, no receptor-level molecular mechanism confirmed\",\n      \"pmids\": [\"8660832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"LAMP-2 cycles between lysosomes and the plasma membrane along the endocytic pathway in cultured rat hepatocytes. Surface-bound anti-LAMP-2 Fab'-HRP conjugates are taken up and delivered to lysosomes in a saturable, cycloheximide-insensitive manner, demonstrating constitutive recycling of LAMP-2 between the cell surface and lysosomes.\",\n      \"method\": \"HRP-conjugated Fab' fragments against LAMP-2, cell fractionation on Percoll gradients, kinetic analysis of uptake, cycloheximide treatment\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct quantitative trafficking assay with defined kinetics; single lab\",\n      \"pmids\": [\"8276775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"A significant fraction (~45%) of newly synthesized LAMP-2 is transported from the trans-Golgi to early endosomes and then delivered to dense lysosomes via perinuclear late endosomes, a route distinct from the predominantly intracellular (late-endosome-direct) route taken by LAMP-1.\",\n      \"method\": \"Biosynthetic transport kinetics in rat hepatocytes by pulse-chase with subcellular fractionation, quantitative trafficking assays\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative kinetic fractionation, direct comparison with LAMP-1 route; single lab\",\n      \"pmids\": [\"9010755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The extent of polylactosamine glycosylation of LAMP-2 is determined by its Golgi residence time, not by glycosyltransferase expression levels. Longer transit time through the Golgi (as found in 1-day vs 3-day MDCK cells) results in greater polylactosamine modification of LAMP-2.\",\n      \"method\": \"Endoglycosidase treatment, nocodazole and 20°C block experiments, glycosyltransferase activity assays, MDCK epithelial polarization model\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — enzymatic assays and pharmacological Golgi retention manipulation; single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"9675228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LAMP-2 (CD107b) functions as an endocytic receptor on the surface of human monocyte-derived dendritic cells (MoDC). After ligation, LAMP-2 is internalized and traffics transiently to the MHC class II loading compartment. Antigen conjugated to anti-LAMP-2 antibody is diverted away from MHC II surface presentation and instead concentrated in exosomes, which are a uniquely effective source of antigen for T cell proliferation.\",\n      \"method\": \"Antibody ligation and internalization assays, live-cell imaging of trafficking to MHC II compartments, flow cytometry for surface HLA-DR, T cell proliferation assays (direct and transwell), extracellular vesicle isolation and characterization by Western blot\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays in single study; single lab, no molecular receptor-ligand reconstitution\",\n      \"pmids\": [\"28607115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LAMP-2 on the host cell surface is the receptor for Trypanosoma cruzi metacyclic trypomastigote surface molecule gp82. Antibody to LAMP-2 (but not LAMP-1) significantly reduced T. cruzi invasion; LAMP-2-depleted cells were more resistant to invasion; and co-immunoprecipitation demonstrated that gp82 binds to LAMP-2 but not LAMP-1.\",\n      \"method\": \"Antibody blocking assays, siRNA-mediated LAMP-1 and LAMP-2 knockdown in HeLa cells, co-immunoprecipitation with protein A/G magnetic beads cross-linked with anti-LAMP-1 or anti-LAMP-2 antibodies, dose-response binding assays with recombinant gp82\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, antibody blocking, and knockdown with functional readout; single lab\",\n      \"pmids\": [\"30609224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Galectin-9 is enriched in lysosomes of gut epithelial cells and binds predominantly to LAMP2 in an N-glycan-dependent manner, specifically at Asn175 of LAMP2. Loss of galectin-9 N-glycan-binding capability depletes galectin-9 from lysosomes and causes defective autophagy, leading to ER stress in autophagy-active cells (Paneth cells and acinar cells) and subsequent colitis and pancreatic disorders.\",\n      \"method\": \"Co-immunoprecipitation, glycan-binding mutant galectin-9 constructs, LAMP2 Asn175 site-specific mutagenesis, immunofluorescence co-localization, autophagy flux assays, mouse models of colitis and pancreatic disease\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-specific mutagenesis of both binding partners, Co-IP, functional rescue, in vivo phenotypes; multiple orthogonal methods\",\n      \"pmids\": [\"32855403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FUT1-mediated α1,2-fucosylation of LAMP-2 (and LAMP-1) regulates lysosomal positioning. FUT1 knockdown causes a shift from peripheral to perinuclear lysosomal distribution and is correlated with increased autophagic flux, decreased mTORC1 activity, and enhanced autophagosome-lysosome fusion.\",\n      \"method\": \"FUT1 knockdown, MALDI-TOF glycan analysis, nanoLC-MS3 glycopeptide analysis, immunofluorescence for LAMP-1/2 localization, mTORC1 activity assays, autophagic flux measurements\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — glycan mass spectrometry and functional knockdown with multiple readouts; single lab\",\n      \"pmids\": [\"27560716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LAMP2 is required for proper autophagy in cortical thymic epithelial cells (cTECs) and for MHC II antigen processing. Genetic inactivation of Lamp2 in thymic stromal cells specifically impairs CD4 T cell development (positive selection) without misdirecting MHC II-restricted cells to the CD8 lineage. This is mechanistically linked to altered MHC II processing and reduced CD4 TCR repertoire diversity.\",\n      \"method\": \"Thymic stroma-specific Lamp2 knockout mice, flow cytometry of T cell subsets, MHC II processing assays, TCR repertoire sequencing\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with defined developmental phenotype and mechanistic pathway placement; single lab\",\n      \"pmids\": [\"35535798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CREG1 protects LAMP2 from proteasomal degradation by inhibiting FBXO27, an E3 ubiquitin ligase that targets LAMP2 for degradation. LAMP2 overexpression reverses the inhibition of autophagy caused by CREG1 knockdown in palmitate-stimulated cardiomyocytes, placing LAMP2 downstream of the CREG1-FBXO27 axis in the regulation of autophagic flux in the heart.\",\n      \"method\": \"Co-immunoprecipitation, CREG1 overexpression/knockdown, LAMP2 overexpression rescue, Western blot for FBXO27 and LAMP2 levels, diabetic cardiomyopathy mouse models\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying FBXO27 as E3 ligase for LAMP2 with rescue experiment; single lab\",\n      \"pmids\": [\"37658156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LAMP-2 deficiency in pancreatic acinar cells leads to impaired autophagic flux (accumulation of autophagosomes, failure of autolysosome formation), which progresses to trypsinogen activation, macrophage-driven inflammation, and acinar cell death. Pancreatitis models show LAMP degradation mediated by cathepsin B cleavage near the boundary between luminal and transmembrane domains.\",\n      \"method\": \"LAMP-2 knockout mice (spontaneous pancreatitis model), mass spectrometry to identify cathepsin B cleavage sites, electron microscopy, trypsinogen activation assays, amylase secretion assays\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic KO model with defined disease phenotype, mass spectrometry identification of cleavage site, multiple functional readouts\",\n      \"pmids\": [\"26693174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LAMP-2 deficiency in retinal pigment epithelium (RPE) cells retards phagocytic degradation of photoreceptor outer segments, compromises lysosomal degradation, and increases exocytosis, leading to age-dependent accumulation of basal laminar deposits resembling early AMD pathology. LAMP2 expression declines with age in RPE cells.\",\n      \"method\": \"Lamp2 knockout mice, electron microscopy, fundus autofluorescence imaging, immunofluorescence for APOE/APOA1/clusterin/vitronectin, phagocytosis and lysosomal degradation assays in RPE cells, analysis of AMD patient eyes\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse model with multiple orthogonal methods and human AMD tissue corroboration\",\n      \"pmids\": [\"31699817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LAMP-2 deficiency in vascular smooth muscle cells (VSMC) causes accumulation of autophagic vacuoles (impaired mitophagy), phenotypic switching from contractile (α-SMA+) to synthetic (vimentin+) phenotype, mitochondrial fragmentation, enhanced mitochondrial respiration, and overproduction of ROS. In vivo, LAMP-2-deficient mice develop medial arterial thickening with luminal stenosis due to VSMC proliferation.\",\n      \"method\": \"LAMP-2 KO mice (9–24 months), ultrastructural analysis, immunofluorescence for vimentin/α-SMA, LAMP2 siRNA knockdown in human brain VSMC, mitochondrial respiration assays, ROS measurements\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse in vivo phenotype with cell-level mechanism confirmed by siRNA; single lab\",\n      \"pmids\": [\"29463847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In ischemic cardiomyocytes, LAMP2 overexpression alleviates autophagic flux blockade by promoting the trafficking of cathepsin B and cathepsin D to lysosomes, thereby preventing lysosomal membrane permeabilization (LMP) and cardiomyocyte death.\",\n      \"method\": \"Adenoviral LAMP2 overexpression in OGD-treated cardiomyocytes, cathepsin trafficking assays, LMP assays, cell viability assays, drug/gene-based autophagic flux modulation\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — overexpression with mechanistic cathepsin trafficking readout; single lab, in vitro model\",\n      \"pmids\": [\"32117965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"LAMP-1 and LAMP-2 are present in the membranes of specific granules and secretory vesicles in human neutrophils, but are absent from azurophil granules. During phagocytosis, both LAMP proteins become concentrated around ingested particles and appear on the cell surface upon mobilization of secretory organelles.\",\n      \"method\": \"Subcellular fractionation, Western blotting, immunostaining, phagocytosis assays in human neutrophil granulocytes\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct fractionation with functional phagocytosis readout; single study\",\n      \"pmids\": [\"7487911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"LAMP-2 is present in platelet dense granule membranes in addition to lysosomal granule membranes. Upon thrombin stimulation, LAMP-2 shows biphasic surface expression: early expression associated with dense granule release and late expression associated with lysosomal granule release. In Hermansky-Pudlak syndrome platelets lacking dense granules, only the late lysosome-associated LAMP-2 surface expression is observed.\",\n      \"method\": \"Immunoblotting of dense granule preparations, flow cytometry of thrombin-stimulated platelets, HPS patient platelets as natural dense-granule-deficient control, immunoelectron microscopy with anti-serotonin antibody to identify dense granules\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — fractionation, EM co-localization, and natural disease model; single lab\",\n      \"pmids\": [\"8743190\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LAMP2 is a major lysosomal membrane glycoprotein whose luminal N-glycans protect it from proteolytic degradation; its LAMP-2A isoform serves as the CMA receptor (requiring four unique cytosolic tail basic residues for substrate binding), while all isoforms participate in autophagosome-lysosome fusion by ensuring STX17 recruitment to autophagosomes, in endosomal cholesterol export via the luminal domain, in phagosome maturation (Rab7 acquisition and centripetal transport), in lysosomal enzyme trafficking, and in stabilizing partner proteins such as TAPL; its isoform-specific cytosolic tails determine differential targeting between lysosomes and the cell surface, and at the cell surface LAMP-2 mediates leukocyte adhesion to endothelium, acts as an endocytic receptor on dendritic cells routing antigen into immunogenic exosomes, and serves as the host-cell receptor for T. cruzi gp82.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LAMP2 is a major lysosomal membrane glycoprotein that integrates autophagy, organelle maturation, and membrane trafficking, with isoform-specific cytosolic tails directing distinct cellular roles [#0, #1]. Its luminal Asn-linked oligosaccharides protect the protein from intralysosomal proteolysis, and loss of LAMP-1/LAMP-2 delays delivery of endocytosed material to dense lysosomes [#2]. The LAMP-2A isoform serves as the receptor for chaperone-mediated autophagy, binding substrate proteins through four positively-charged residues unique to its cytosolic tail, with lysosomal LAMP-2A levels setting CMA rates [#0]; the COOH-terminal residue of each splice variant's cytosolic tail determines its steady-state partition between lysosomes and the cell surface [#1]. Beyond CMA, LAMP2 is broadly required for macroautophagy: it is needed to incorporate syntaxin-17 into autophagosomes, a prerequisite for autophagosome–lysosome fusion [#5], and its deficiency in vivo prolongs autophagic vacuole half-life and disrupts lysosomal enzyme trafficking, including cathepsin D processing and mannose-6-phosphate receptor recycling [#3]. LAMP2 also drives phagosome maturation through Rab7/RILP-dependent centripetal transport [#7], mediates endosomal/lysosomal cholesterol export via its luminal membrane-proximal domain [#4], and stabilizes partner membrane proteins such as the lysosomal peptide transporter TAPL/ABCB9 against degradation [#9]. The protein's stability and function are further tuned by glycan-dependent interactions, including galectin-9 binding at Asn175 that supports autophagy [#16], and by a CREG1–FBXO27 axis controlling its proteasomal turnover [#19]. Loss of LAMP2 produces tissue-specific autophagy and lysosomal degradation failures in pancreatic acinar cells [#20], retinal pigment epithelium [#21], vascular smooth muscle [#22], and thymic epithelium where it shapes MHC II-restricted CD4 T cell selection [#18]. At the cell surface LAMP-2 acts in leukocyte adhesion to endothelium [#10], as an endocytic receptor on dendritic cells routing antigen into immunogenic exosomes [#14], and as the host-cell receptor for Trypanosoma cruzi gp82 [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established that LAMP-2 is not a static lysosomal resident but constitutively cycles between the cell surface and lysosomes, framing its dual intracellular/surface biology.\",\n      \"evidence\": \"HRP-conjugated anti-LAMP-2 Fab' uptake kinetics with Percoll fractionation in rat hepatocytes\",\n      \"pmids\": [\"8276775\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular machinery controlling recycling not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Showed LAMP-2 reaches lysosomes by a route distinct from LAMP-1, revealing isoform/family-specific trafficking itineraries.\",\n      \"evidence\": \"Pulse-chase biosynthetic transport kinetics with subcellular fractionation in rat hepatocytes\",\n      \"pmids\": [\"9010755\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Sorting determinants for the early-endosome route not mapped\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Resolved why LAMP-2 splice variants differ in localization, attributing surface-vs-lysosome partition to the COOH-terminal cytosolic residue rather than machinery saturation.\",\n      \"evidence\": \"Chimeric LAMP-1/LAMP-2 constructs and C-terminal site-directed mutagenesis with fractionation/microscopy\",\n      \"pmids\": [\"9166415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor proteins reading each tail signal not identified\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated that LAMP proteins are sorted at the TGN into a vesicle class distinct from MPR/clathrin carriers, defining a separate biosynthetic export pathway.\",\n      \"evidence\": \"In vitro TGN budding assay with CMP-sialic acid labeling and brefeldin A/wortmannin dissection\",\n      \"pmids\": [\"9668075\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coat/adaptor components of the LAMP vesicle not identified\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined a protective function for LAMP-2 luminal glycans and showed LAMP depletion slows endocytic delivery to dense lysosomes without altering lumenal pH.\",\n      \"evidence\": \"In-cell endoglycosidase H deglycosylation, metabolic labeling, and fractionation/pH assays\",\n      \"pmids\": [\"10521503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the proteases degrading deglycosylated LAMP-2 not established\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified LAMP-2A as the CMA receptor and pinpointed four cytosolic-tail basic residues as the substrate-binding determinant, linking receptor abundance to pathway flux.\",\n      \"evidence\": \"Isoform-specific antibodies, substrate binding assays, and tail mutagenesis correlated with CMA rates in rat liver/fibroblasts\",\n      \"pmids\": [\"11082038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of substrate recognition not resolved\", \"Other CMA components not addressed here\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed via knockout mice that LAMP-2 loss disrupts autophagic vacuole turnover, lysosomal enzyme processing, and MPR recycling, placing LAMP-2 at multiple trafficking nodes.\",\n      \"evidence\": \"Quantitative EM, endocytic tracers, cathepsin D metabolic labeling, and MPR immunofluorescence in LAMP-2 KO hepatocytes\",\n      \"pmids\": [\"12221139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular interactions driving each defect not dissected\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placed LAMP-1/LAMP-2 upstream of Rab7 in phagosome maturation, explaining a microbicidal defect through arrested RILP/dynein-mediated centripetal transport.\",\n      \"evidence\": \"Single and double LAMP knockout MEFs and human siRNA with bacterial killing and Rab7/RILP localization assays\",\n      \"pmids\": [\"17506821\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LAMPs promote Rab7 acquisition mechanistically is unknown\", \"Functional redundancy between LAMP-1 and LAMP-2\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Assigned a CMA-independent role for the LAMP-2 luminal domain in endosomal/lysosomal cholesterol export.\",\n      \"evidence\": \"LAMP-1/2 double-KO cells, isoform and luminal-truncation rescue, cholesterol esterification assays, and KO mouse liver cholesterol\",\n      \"pmids\": [\"19929948\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct cholesterol-handling partner of the luminal domain not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified LAMP-2B as a stabilizing partner of the lysosomal transporter TAPL/ABCB9, showing LAMP proteins protect membrane partners from intraluminal degradation.\",\n      \"evidence\": \"Proteomic Co-IP, TMD0 domain mapping, and pulse-chase half-life in LAMP-deficient cells\",\n      \"pmids\": [\"22641697\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other lysosomal transporters are similarly stabilized unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established that LAMP-2 is required for syntaxin-17 incorporation into autophagosomes, mechanistically explaining its role in autophagosome–lysosome fusion.\",\n      \"evidence\": \"LAMP-2/double-KO MEFs, tandem mRFP-GFP-LC3 reporter, and LAMP-2A rescue with STX17/VAMP8 localization\",\n      \"pmids\": [\"27628032\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LAMP-2 directs STX17 to autophagosomes (direct vs indirect) not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided structural insight into the LAMP β-prism fold and revealed opposite N-domain effects on multimerization for LAMP-1 versus LAMP-2.\",\n      \"evidence\": \"Crystal structure determination and N-domain truncation immunoprecipitation assembly assays\",\n      \"pmids\": [\"27663661\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of differential assembly not established\", \"Single structural study\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed glycan-dependent galectin-9 binding at LAMP2 Asn175 sustains lysosomal autophagy and protects autophagy-active epithelia from ER stress.\",\n      \"evidence\": \"Co-IP, galectin-9 glycan-binding mutants, LAMP2 Asn175 mutagenesis, autophagy flux, and colitis/pancreatic mouse models\",\n      \"pmids\": [\"32855403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream lysosomal events of galectin-9 recruitment not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a CREG1–FBXO27 axis controlling LAMP2 stability, identifying FBXO27 as an E3 ligase targeting LAMP2 for proteasomal degradation.\",\n      \"evidence\": \"Co-IP, CREG1 gain/loss, LAMP2 overexpression rescue, and diabetic cardiomyopathy mouse models\",\n      \"pmids\": [\"37658156\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination site(s) on LAMP2 not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified surface LAMP-2 as the host receptor for T. cruzi gp82, extending LAMP-2 surface biology to pathogen entry.\",\n      \"evidence\": \"Antibody blocking, LAMP-1/2 siRNA, and gp82 Co-IP/binding assays in HeLa cells\",\n      \"pmids\": [\"30609224\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor-ligand interaction not reconstituted with purified components\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LAMP-2's distinct molecular activities (CMA receptor, STX17 incorporation, cholesterol export, partner stabilization) are coordinated by isoform/glycan state on a single lysosomal membrane remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural/biochemical model linking the luminal and cytosolic functions\", \"Adaptors and direct binding partners for most trafficking roles unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005765\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 10, 11, 14, 15]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3, 12]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [24, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 3, 5, 16, 20]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 6, 7, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 14, 18]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"STX17\", \"ABCB9\", \"LGALS9\", \"FBXO27\", \"CREG1\", \"LAMP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}