{"gene":"CD207","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2000,"finding":"Langerin is a type II Ca2+-dependent C-type lectin with mannose-binding specificity, constitutively associated with Birbeck granules, that induces formation of Birbeck granules upon transfection into fibroblasts, demonstrating it is a potent inducer of membrane superimposition and zippering leading to Birbeck granule formation.","method":"cDNA transfection into fibroblasts, electron microscopy, antibody internalization assay","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in fibroblasts with direct morphological readout, foundational paper replicated by multiple subsequent studies","pmids":["10661407"],"is_preprint":false},{"year":1999,"finding":"Langerin is a 40-kDa cell surface protein (pI 5.2–5.5) that is rapidly internalized at 37°C but does not gain access to MHC class II compartments; it does not colocalize with LAMP-1 lysosomal markers.","method":"Monoclonal antibody generation, immunoprecipitation, internalization assay, immunofluorescence colocalization","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal immunoprecipitation, biochemical characterization, internalization assay with subcellular marker colocalization","pmids":["10508244"],"is_preprint":false},{"year":2002,"finding":"Birbeck granules are subdomains of the endosomal recycling compartment in human epidermal Langerhans cells that form where Langerin accumulates; Langerin internalizes by classical receptor-mediated endocytosis and first appears in Birbeck granules connected to recycling endosomes in the pericentriolar area. Inhibition of endocytosis produces open-ended Birbeck granule-like structures at the plasma membrane, while inhibition of recycling causes Birbeck granules to merge with a tubular endosomal network. ARF proteins are implicated in Langerin trafficking.","method":"Drug inhibition of endocytosis/recycling, immunofluorescence, electron microscopy, subcellular fractionation in primary human LCs","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal pharmacological perturbations with direct morphological and biochemical readouts in primary cells","pmids":["11809842"],"is_preprint":false},{"year":2003,"finding":"The extracellular region of langerin exists as a stable trimer held together by a coiled-coil of alpha-helices formed by the neck region. The langerin CRD shows specificity for mannose, GlcNAc, and fucose, but only the trimeric extracellular domain binds glycoprotein ligands. Langerin binds mammalian high-mannose oligosaccharides and mannose-containing structures on yeast invertase but not complex glycans. Full-length langerin mediates efficient uptake and degradation of mannosylated neoglycoprotein ligands, with pH-dependent ligand release involving CRD-neck interactions.","method":"Analytical ultracentrifugation, circular dichroism spectroscopy, sugar binding assays, transfection of full-length langerin in rat fibroblasts, endocytosis assay with mannosylated neoglycoprotein","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple biophysical methods plus functional cell-based uptake assay in single rigorous study","pmids":["12626394"],"is_preprint":false},{"year":2004,"finding":"Langerhans cells utilize langerin to present nonpeptide antigens of Mycobacterium leprae to T cell clones in a CD1a-restricted and langerin-dependent manner; LC-like DCs were more efficient at CD1a-restricted antigen presentation than monocyte-derived DCs.","method":"Antigen presentation assay with LC-derived DCs and T cell clones, anti-langerin antibody blocking, freshly isolated epidermal LCs from leprosy patients","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional blocking with anti-langerin antibody plus multiple cell types tested, replicated with primary cells","pmids":["14991068"],"is_preprint":false},{"year":2005,"finding":"Genetic disruption of langerin abolishes Birbeck granules in Langerhans cells without altering LC numbers, morphology, antigen capture, migration to lymph nodes, phenotypic maturation, OVA presentation on MHC II to CD4+ T cells, or cross-presentation on MHC I to CD8+ T cells. Langerin and Birbeck granules are dispensable for these LC functions.","method":"Langerin knockout mouse (langerin-/- on C57BL/6), electron microscopy, FACS, antigen presentation assays, in vivo pathogen challenge","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — clean knockout with multiple orthogonal functional readouts in a well-controlled genetic model","pmids":["15601833"],"is_preprint":false},{"year":2007,"finding":"Langerin prevents HIV-1 transmission by Langerhans cells: HIV-1 captured by langerin is internalized into Birbeck granules and degraded. Inhibition of langerin allowed LC infection and subsequent HIV-1 transmission. LCs also inhibited T-cell infection by viral clearance through langerin.","method":"Primary human LC HIV-1 infection assays, anti-langerin blocking antibody, T-cell transmission assay, fluorescence microscopy","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain/loss-of-function with antibody blocking, primary human cells, multiple functional readouts, high-impact replication","pmids":["17334373"],"is_preprint":false},{"year":2007,"finding":"Rab11A controls the biogenesis of Birbeck granules by regulating Langerin recycling and stability; dominant-negative Rab11A or Rab11A depletion causes missorting of Langerin to lysosomal compartments and abrogates BG formation. Loss of Rab11A-interacting protein RCP (but not Rip11) also modestly affects Langerin stability and BG biogenesis.","method":"Dominant-negative Rab11A overexpression, siRNA Rab11A depletion, siRNA RCP/Rip11 depletion, immunofluorescence, electron microscopy in Langerin-transfected cells","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple genetic perturbations (dominant-negative + siRNA) with direct morphological and biochemical readouts","pmids":["17538027"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of the langerin CRD reveals a fold similar to DC-SIGN with two sugar-binding sites: one Ca2+-dependent (conserved in C-type lectins) binding mannose, and a second novel Ca2+-independent site; complexes with mannose and maltose resolved at 1.6 Å and 2.1 Å respectively.","method":"X-ray crystallography (apo at 2.5 Å; mannose complex at 1.6 Å; maltose complex at 2.1 Å) of recombinant langerin CRD","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structures with bound ligands; single lab but rigorous structural method","pmids":["18061677"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of trimeric langerin extracellular fragment at high resolution shows the neck region forms a coiled-coil of alpha-helices; multiple interactions between neck and CRDs create a rigid trimer with three Ca2+-dependent sugar-binding sites separated by 42 Å. High-mannose oligosaccharides are the best trimeric langerin ligands by glycan array screening.","method":"X-ray crystallography of trimeric langerin extracellular fragment, analytical ultracentrifugation, glycan array screening","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus biophysical characterization plus glycan array; multiple orthogonal methods","pmids":["20181944"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of the human langerin CRD solved at 1.5 Å; molecular modeling of gp120 high-mannose binding was validated. Truncation and mutagenesis studies in transfected fibroblasts identified the role of the CRD in membrane zipping during Birbeck granule formation, with some contribution from the cytoplasmic domain.","method":"X-ray crystallography (1.5 Å), molecular modeling, truncation and point-mutant transfection in fibroblasts, electron microscopy","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus structure-guided mutagenesis with functional BG-formation readout","pmids":["19175323"],"is_preprint":false},{"year":2009,"finding":"Langerin has dual specificity: outstanding affinity for galactose-6-sulfated oligosaccharides (including keratan sulfate) through an extended binding site, and preserved mannose-binding activity. Mutagenesis identified Lys-299 and Lys-313 as forming the extended binding site for sulfated glycans.","method":"Comprehensive glycoconjugate microarray, quantitative frontal affinity chromatography, site-directed mutagenesis of Lys-299 and Lys-313","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — site-directed mutagenesis plus two orthogonal binding assays identifying specific residues","pmids":["20026605"],"is_preprint":false},{"year":2010,"finding":"Crystal structures of human langerin CRD bound to oligomannose compounds, blood group B antigen, and a β-glucan fragment reveal that all bind through a single Ca2+-dependent site via coordination of vicinal hydroxyl groups. Oligomannose binds through a single mannose residue; β-glucan (Glcβ1-3Glcβ1-3Glc) binds through a single glucose residue; fucose of blood group B binds Ca2+ site. 6-sulfated galactose coordinates Ca2+ via equatorial 3-OH and axial 4-OH, with salt bridges to two lysine residues. No evidence for a second Ca2+-independent binding site was found in these structural studies.","method":"X-ray crystallography of CRD–ligand complexes, bacterial polysaccharide microarray screening","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple high-resolution crystal structures with diverse ligands; single rigorous study with multiple orthogonal approaches","pmids":["21112338"],"is_preprint":false},{"year":2010,"finding":"Langerin is the primary fungal receptor on Langerhans cells, recognizing both mannan and β-glucan structures on fungal cell walls. Langerin interacts with Candida and Saccharomyces species and Malassezia furfur, but only weakly with Cryptococcus species; anti-langerin antibody blocks LC–fungal interactions.","method":"Binding assays with recombinant langerin, LC fungal interaction assays, anti-langerin antibody blocking","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional blocking with anti-langerin antibody plus binding characterization with panel of fungi","pmids":["20097424"],"is_preprint":false},{"year":2004,"finding":"The Birbeck granule-inducing mutation W264R in the langerin CRD (substitution of tryptophan by arginine at position 264) abolishes sugar-binding activity of langerin, and heterozygous presence of this mutation in a human is associated with absence of Birbeck granules.","method":"Human genetic analysis (heterozygous point mutation), expression of mutant Langerin in fibroblasts, sugar-binding assay","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — natural human mutation studied with transfection and direct functional sugar-binding assay","pmids":["15816828"],"is_preprint":false},{"year":2006,"finding":"SNPs in the langerin CRD reduce affinity for mannose and decrease stability of the extracellular domain; the W264R mutation abolishes sugar-binding activity. All four common langerin haplotypes mediate endocytosis of neoglycoprotein ligands in transfected fibroblasts.","method":"Expression of polymorphic full-length langerin in fibroblasts, sugar-binding assays, differential scanning calorimetry on extracellular domain fragments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biophysical assays (DSC) plus cell-based endocytosis with multiple haplotypes; rigorous structure-function study","pmids":["16567809"],"is_preprint":false},{"year":2013,"finding":"A common SNP changing Lys-313 to isoleucine abolishes langerin binding to oligosaccharides with terminal 6SO4-Gal and enhances binding to terminal GlcNAc. This K313I SNP is tightly linked to N288D, which destabilizes the Ca2+-binding site and reduces overall glycan affinity.","method":"Mutagenesis, glycan array screening, X-ray crystallography of polymorphic forms","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus mutagenesis plus glycan array; multiple orthogonal methods in a single study","pmids":["24217250"],"is_preprint":false},{"year":2002,"finding":"Mouse langerin protein forms multimers and binds mannan-agarose (Ca2+-dependent mannose binding); expression in fibroblasts induces Birbeck granule-like structures. A point mutation F244L in the CRD transforms BG into cored tubule-like structures in transfectants.","method":"Recombinant protein expression, mannan-agarose binding assay, cDNA transfection in fibroblasts, electron microscopy","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution in fibroblasts with mutagenesis and direct morphological readout","pmids":["11777972"],"is_preprint":false},{"year":2004,"finding":"Mouse langerin, SIGNR1, and SIGNR3 can each be internalized upon cell-surface expression in transfected non-macrophage cells; mLangerin (unlike mDC-SIGN) mediates uptake of FITC-dextran and zymosan, with distinct carbohydrate recognition properties. FITC-dextran uptake by Langerin is blocked by mannan.","method":"Transfection of tag-labeled lectins in cell lines, FITC-dextran/zymosan uptake assays, blocking with mannan/EDTA","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional uptake assays in transfected cells with specific inhibitors; comparative study, single lab","pmids":["15096474"],"is_preprint":false},{"year":2004,"finding":"Langerin binds a Lewis X-related sequence with sulfate at position 6 of the terminal galactose as its dominant specificity in carbohydrate array screening, distinguishing it from SIGN-R1 and SIGN-R3 which prefer mannose/fucose structures.","method":"Carbohydrate array probing with soluble IgG-Fc chimeras of langerin, SIGN-R1, SIGN-R3; cell-based uptake assays","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — carbohydrate array plus cell-based assay, single study comparing multiple lectins","pmids":["15136555"],"is_preprint":false},{"year":2012,"finding":"A Rab11A/Myosin Vb/Rab11-FIP2 platform regulates langerin trafficking at two distinct sites: at a sorting site in the endosomal recycling compartment (ERC) where transport vesicles form, and at the late stage of docking/tethering and fusion of langerin recycling vesicles to the plasma membrane.","method":"Live-cell FRET, fast FRAP, fast confocal and TIRF microscopy in langerin-expressing cells","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple live-imaging modalities (FRET, FRAP, TIRF) identifying spatiotemporal platform function for a defined cargo","pmids":["22420646"],"is_preprint":false},{"year":2004,"finding":"Langerin traffic and Birbeck granule formation were reconstituted in a human melanoma cell line (M10-22E) transfected with Langerin; Langerin distributes between the Rab11+ endosomal recycling compartment and the plasma membrane, and drives BG biogenesis in the endosomal recycling compartment. Interruption of endocytosis or recycling redistributes intracellular Langerin and alters BG morphology.","method":"Stable transfection of melanoma cells, immunofluorescence, electron microscopy, pharmacological inhibition of endocytosis/recycling","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution in cell line with pharmacological perturbations and direct morphological readouts","pmids":["15191545"],"is_preprint":false},{"year":2014,"finding":"Langerin on Langerhans cells captures HIV-1 as surface trimers through its carbohydrate recognition domain (CRD), preferentially binding gp140 and whole HIV particles; both phases of HIV transfer from epidermal LCs to T cells are inhibited by anti-langerin CRD antibody or soluble trimeric langerin extracellular domain, which did not inhibit direct HIV infection of T cells.","method":"HIV transfer assays with primary eLCs and Mutz-3 LCs, anti-langerin CRD mAb blocking, soluble trimeric langerin inhibition, cross-linking experiments","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple inhibitors (antibody + soluble receptor) applied to primary cells plus cell line model with specific readout","pmids":["25070850"],"is_preprint":false},{"year":2014,"finding":"Langerin-mediated HIV-1 uptake in primary human LCs is caveolin-1-dependent; langerin and caveolin-1 co-localize at the cell membrane and in vesicles; Birbeck granules are langerin/caveolin-1-positive vesicles linked to the lysosomal degradation pathway. Inhibition of caveolar endocytosis or siRNA silencing of caveolin-1 increases HIV-1 integration and infection; inhibition of clathrin-mediated endocytosis does not affect HIV-1 restriction.","method":"Co-localization microscopy, caveolar endocytosis inhibition, caveolin-1 siRNA silencing, clathrin inhibition, HIV-1 integration assay in primary LCs","journal":"Retrovirology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple perturbations (pharmacological + siRNA) with primary human cells and specific molecular readout (HIV integration)","pmids":["25551286"],"is_preprint":false},{"year":2015,"finding":"Langerin functions as an authentic receptor mediating attachment and infectious entry of influenza A virus (IAV) via lectin-mediated recognition of mannose-rich glycans on viral hemagglutinin. Endocytosis-defective langerin mutant bound IAV but prevented infection, confirming internalization is required. Langerin-mediated IAV infection is pH- and dynamin-dependent, uses clathrin- and caveolin-mediated endocytic pathways, and utilizes early (Rab5+) but not late (Rab7+) endosomes.","method":"Lec2 SIA-deficient CHO cells expressing langerin or endocytosis-defective langerin mutant; viral replication, mRNA transcription, protein synthesis assays; pathway inhibitors; endosomal marker colocalization","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in SIA-deficient cells with endocytosis-defective mutant plus pathway characterization with specific inhibitors and endosomal markers","pmids":["26468543"],"is_preprint":false},{"year":2019,"finding":"Human langerin on Langerhans cells directly recognizes Staphylococcus aureus through β-N-acetylglucosamine (GlcNAc) modifications on wall teichoic acid (WTA), discriminating S. aureus from other staphylococci. The S. aureus WTA glycoprofile influences the level of proinflammatory cytokines produced by LCs. In a murine epicutaneous model, S. aureus strongly upregulated Cxcl1, Il6, and Il17, requiring both human langerin and WTA β-GlcNAc.","method":"LC-S. aureus interaction assays, anti-langerin antibody blocking, cytokine measurement, murine epicutaneous infection model with human langerin-expressing and WTA-mutant S. aureus strains","journal":"mBio","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro blocking plus in vivo murine model with genetic controls (WTA mutants + human langerin transgene)","pmids":["31088921"],"is_preprint":false},{"year":2021,"finding":"Langerin specifically recognizes β-GlcNAc (both β1,4 and β1,3 linkages produced by TarS and TarP) but not α1,4-GlcNAc (TarM) on S. aureus WTA; β-GlcNAc is sufficient for langerin binding as demonstrated with chemically synthesized WTA molecules. TarP-modified S. aureus induced increased cytokine production and LC maturation compared to TarS-modified bacteria despite similar langerin recognition.","method":"Genetically modified S. aureus strains, in vitro generated LC binding/activation assays, chemically synthesized WTA molecules, cytokine measurements","journal":"ACS infectious diseases","confidence":"High","confidence_rationale":"Tier 1 / Moderate — chemical synthesis of defined ligands plus genetic bacterial mutants with functional cellular readouts","pmids":["33591717"],"is_preprint":false},{"year":2011,"finding":"Langerin recognizes glycosaminoglycans (GAGs) through a novel Ca2+-independent binding site distinct from the canonical Ca2+-dependent CRD site; this site is only detectable in the trimeric extracellular domain and is specific for 6-O-sulfation and iduronic acid content rather than net charge.","method":"Molecular modeling, surface plasmon resonance-like binding assays, comparison of GAG vs. mannose binding in trimeric vs. monomeric langerin","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biophysical binding characterization plus modeling; finding contrasts with Feinberg 2010 crystal structure showing no second site, creating partial conflict","pmids":["23226363"],"is_preprint":false},{"year":2016,"finding":"An allosteric intradomain network in the langerin CRD modulates Ca2+ affinity depending on pH, promoting fast ligand release; two loops undergo coupled motions controlling Ca2+ binding/release over multiple time scales. Site-directed mutagenesis confirmed the allosteric network.","method":"NMR spectroscopy, molecular dynamics simulations, site-directed mutagenesis of the CRD","journal":"Journal of the American Chemical Society","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR plus MD simulations plus mutagenesis; multiple orthogonal approaches in one study","pmids":["27560542"],"is_preprint":false},{"year":2016,"finding":"Human and murine langerin share identical three-dimensional structures and recognize simple ligands identically, but screening >300 bacterial polysaccharides revealed highly diverging avidity and selectivity for large complex glycans; a highly variable surface adjacent to the canonical binding site likely forms a secondary interaction site for large glycans.","method":"Bacterial polysaccharide microarray (>300 compounds), X-ray crystallography of murine langerin, structural/evolutionary conservation analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure of murine form plus comprehensive carbohydrate screening; identifies species-specific recognition divergence","pmids":["27903635"],"is_preprint":false},{"year":2008,"finding":"Anti-Langerin antibody targeting of splenic CD8+ DCs in vivo mediates efficient antigen presentation to both CD8+ and CD4+ T cells (4–8 cycles of division in 3 days); peptide–MHC I and II complexes persist for days. CD8+ DCs expressing Langerin are located predominantly in the marginal zone of mouse spleen, not in T cell areas.","method":"Antibody-targeted antigen delivery in vivo (hybrid anti-Langerin mAb containing OVA), T-cell division assay, immunolabeling of spleen sections","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo antigen targeting with dose-response plus histological localization; replicated in related studies","pmids":["18322168"],"is_preprint":false},{"year":2011,"finding":"Langerin captures measles virus on human primary Langerhans cells; immature LCs present MV antigens via HLA class II to CD4+ T cells but are not susceptible to productive MV infection and cannot cross-present exogenous MV to CD8+ T cells. Mature LCs can be infected by MV and present endogenously synthesized viral antigens to CD8+ T cells, but neither immature nor mature LCs cross-present MV.","method":"Primary human LC infection assays, anti-langerin antibody blocking, MHC class I/II antigen presentation assays with MV-specific T cells, UV-inactivated MV cross-presentation assay","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — antibody blocking with primary human cells and defined T-cell readouts; multiple antigen presentation pathways tested","pmids":["21739428"],"is_preprint":false},{"year":2015,"finding":"Langerin on primary human Langerhans cells routes internalized antigen to early endosomes (EEA1+), enhancing cross-presentation to CD8+ T cells; anti-langerin antibody-modified synthetic long peptides, but not anti-dectin-1, enhanced cross-presentation. Langerin-mediated internalization routes antigens to less proteolytic early endosomal compartments.","method":"Anti-langerin and anti-dectin-1 antibody-coupled SLP antigen delivery, early endosome co-localization (EEA1), CD8+ T-cell cross-presentation assay with primary human LCs","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — receptor-specific targeting with subcellular localization readout and functional T-cell assay using primary cells","pmids":["26456691"],"is_preprint":false},{"year":2015,"finding":"Langerin recognizes hyaluronic acid on dendritic cells, mediating clustering (adhesion) between Langerhans cells and DCs; this LC-DC clustering leads to DC maturation and facilitates antigen transfer of HIV-1 to DCs for subsequent CD8+ T-cell activation. Hyaluronidase-2 upregulation by DC maturation degrades hyaluronic acid and abrogates LC-DC interactions.","method":"Anti-langerin antibody blocking, hyaluronic acid removal from DCs, LC-DC clustering assay, HIV-1 antigen transfer assay, CD8+ T-cell activation readout","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional blocking assays with defined ligand removal and multiple readouts; single lab","pmids":["26170391"],"is_preprint":false},{"year":2015,"finding":"Langerin (CD207) serves as a phagocytic receptor for Yersinia pestis; Y. pestis invades Langerhans cells and langerin-transfected cells via interaction of core oligosaccharides with langerin. Shielding or truncating bacterial core oligosaccharides or adding purified langerin, anti-CD207 antibody, or competing oligosaccharides reduces invasion. Langerin-mediated uptake promotes Y. pestis dissemination to lymph nodes in a murine model.","method":"Y. pestis invasion assays with LCs and langerin transfectants, inhibitor competition assays (purified langerin, anti-CD207, oligosaccharides), murine in vivo infection model","journal":"Immunology and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based invasion assay with multiple blocking strategies plus in vivo dissemination model; single lab","pmids":["25829141"],"is_preprint":false},{"year":2005,"finding":"HPV 16 virus-like particles colocalize with langerin on the cell surface and in cytoplasmic vesicles of Langerhans cells by electron microscopy, and exhibit faster entry kinetics in LCs compared to DCs, entering near the nuclear membrane within 10 minutes; both LCs and DCs internalize HPV16 VLPs via a clathrin-dependent pathway into endosomal vesicles.","method":"Electron microscopy colocalization, time-course internalization experiments, clathrin inhibitor studies with HPV16 VLPs in primary LCs and DCs","journal":"The Journal of general virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EM colocalization plus inhibitor studies; single lab, single virus type","pmids":["15831940"],"is_preprint":false}],"current_model":"CD207/Langerin is a type II transmembrane C-type lectin that functions as a trimeric (coiled-coil neck stabilized) endocytic pattern recognition receptor on Langerhans cells, recognizing diverse glycan ligands (mannose, GlcNAc, fucose, 6-sulfated galactose, β-glucan) via a primary Ca2+-dependent CRD site and possibly secondary sites; ligand capture triggers clathrin- and caveolin-mediated internalization routed through Rab11A/Myosin Vb/Rab11-FIP2-regulated recycling endosomes, where Langerin accumulation drives the biogenesis of Birbeck granules as specialized lysosomal-linked compartments that degrade captured pathogens (e.g., HIV-1, fungi), while langerin-mediated routing to early endosomes can alternatively enhance MHC-I cross-presentation; an allosteric intradomain network modulates Ca2+ affinity in a pH-dependent manner to promote cargo release, and specific natural polymorphisms (K313I, N288D, W264R) alter glycan specificity, reduce stability, or abolish both sugar binding and Birbeck granule formation."},"narrative":{"mechanistic_narrative":"CD207/Langerin is a type II Ca2+-dependent C-type lectin of Langerhans cells (LCs) that acts as an endocytic pattern-recognition receptor and the architect of Birbeck granules, specialized membrane compartments it generates by inducing membrane superimposition and zippering [PMID:10661407, PMID:11809842]. Its extracellular region assembles into a rigid trimer stabilized by a coiled-coil neck, an arrangement required for high-avidity capture of glycoprotein ligands; the trimeric protein binds high-mannose oligosaccharides optimally, and full-length langerin mediates uptake and degradation of mannosylated cargo with pH-dependent release governed by CRD-neck interactions [PMID:12626394, PMID:20181944]. Glycan recognition occurs primarily at a single Ca2+-dependent CRD site that accommodates diverse ligands—mannose, GlcNAc, fucose-bearing blood group antigens, beta-glucan, and 6-sulfated galactose—through coordination of vicinal hydroxyls, with lysine residues (Lys-299, Lys-313) forming an extended subsite for sulfated glycans [PMID:20026605, PMID:21112338], while an allosteric intradomain network couples pH to Ca2+ affinity to drive fast cargo release [PMID:27560542]. After ligand capture langerin internalizes by receptor-mediated endocytosis and is routed through the Rab11A-positive endosomal recycling compartment, where a Rab11A/Myosin Vb/Rab11-FIP2 platform controls its sorting, recycling and stability; loss of Rab11A missorts langerin to lysosomes and abolishes Birbeck granule biogenesis [PMID:17538027, PMID:22420646, PMID:15191545]. Functionally, langerin captures and degrades pathogens—it internalizes HIV-1 into Birbeck granules via caveolin-1-dependent uptake to restrict LC infection and T-cell transmission [PMID:17334373, PMID:25551286], serves as the principal fungal receptor recognizing mannan and beta-glucan [PMID:20097424], discriminates Staphylococcus aureus through beta-GlcNAc on wall teichoic acid to shape proinflammatory cytokine output [PMID:31088921, PMID:33591717], and acts as an entry receptor for influenza A virus through mannose-rich hemagglutinin glycans [PMID:26468543]. Langerin also directs antigen handling: routing cargo to early endosomes enhances MHC-I cross-presentation [PMID:26456691], and it contributes to CD1a-restricted presentation of mycobacterial lipids [PMID:14991068]. Birbeck granules themselves are dispensable for core LC antigen-presentation functions [PMID:15601833]. Natural CRD polymorphisms tune or abrogate function—W264R abolishes sugar binding and Birbeck granule formation, while the linked K313I/N288D variants redirect glycan specificity and destabilize the Ca2+ site [PMID:15816828, PMID:24217250].","teleology":[{"year":1999,"claim":"Establishing langerin as a distinct, rapidly internalized LC surface molecule defined the protein biochemically and showed its trafficking diverged from classical MHC II antigen-loading routes.","evidence":"Monoclonal antibody generation, immunoprecipitation, internalization and colocalization assays","pmids":["10508244"],"confidence":"High","gaps":["No molecular identity of the internalization route","Ligand and function unknown at this stage"]},{"year":2000,"claim":"Cloning langerin and demonstrating that its expression alone induces Birbeck granules in fibroblasts established it as both a mannose-binding C-type lectin and the causal driver of these LC-specific organelles.","evidence":"cDNA transfection into fibroblasts, electron microscopy, antibody internalization assay","pmids":["10661407"],"confidence":"High","gaps":["Mechanism of membrane zippering undefined","Physiological glycan ligands not mapped"]},{"year":2002,"claim":"Showing Birbeck granules are subdomains of the endosomal recycling compartment forming where langerin accumulates placed langerin trafficking within defined endocytic and recycling pathways.","evidence":"Pharmacological inhibition of endocytosis/recycling, immunofluorescence, EM, fractionation in primary human LCs","pmids":["11809842"],"confidence":"High","gaps":["Specific Rab/motor machinery not yet identified","ARF involvement only implicated"]},{"year":2003,"claim":"Defining the trimeric architecture stabilized by the coiled-coil neck and its requirement for glycoprotein binding linked langerin oligomerization to ligand avidity and pH-dependent release.","evidence":"Analytical ultracentrifugation, circular dichroism, sugar-binding and neoglycoprotein endocytosis assays","pmids":["12626394"],"confidence":"High","gaps":["Atomic structure of the trimer not yet resolved","Secondary binding sites not addressed"]},{"year":2005,"claim":"Knockout of langerin in mice showed Birbeck granules are dispensable for canonical LC antigen-capture and presentation, separating the organelle-forming role from general LC immune function.","evidence":"Langerin-/- mouse, EM, FACS, MHC I/II antigen presentation assays, in vivo challenge","pmids":["15601833"],"confidence":"High","gaps":["Did not test pathogen-specific capture roles","Mouse vs human functional divergence not addressed"]},{"year":2007,"claim":"Identifying Rab11A as the master regulator of langerin recycling, stability and Birbeck granule biogenesis connected the receptor to a defined endosomal sorting machinery.","evidence":"Dominant-negative Rab11A, siRNA of Rab11A and RCP/Rip11, immunofluorescence, EM in transfected cells","pmids":["17538027"],"confidence":"High","gaps":["Motor and tethering components not yet defined","Sorting signals on langerin not mapped"]},{"year":2007,"claim":"Demonstrating that langerin captures and degrades HIV-1 in Birbeck granules to prevent LC infection and transmission established a protective antiviral function for the receptor.","evidence":"Primary human LC HIV-1 infection and transmission assays, anti-langerin blocking antibody","pmids":["17334373"],"confidence":"High","gaps":["Endocytic pathway mediating uptake not yet defined","Viral glycan epitope not yet identified"]},{"year":2009,"claim":"High-resolution crystal structures of the CRD and trimeric ectodomain revealed three Ca2+-dependent sugar sites 42 Å apart and confirmed high-mannose glycans as optimal ligands, providing the structural basis for multivalent recognition.","evidence":"X-ray crystallography of CRD and trimeric fragment, AUC, glycan array, structure-guided mutagenesis","pmids":["18061677","20181944","19175323"],"confidence":"High","gaps":["Existence of a Ca2+-independent second site debated","Structural basis of membrane zipping inferred indirectly"]},{"year":2010,"claim":"Comprehensive structural and array studies established a single Ca2+-dependent site as the binding hub for diverse glycans (oligomannose, beta-glucan, blood group B, 6-sulfated galactose) and mapped lysine-dependent recognition of sulfated sugars.","evidence":"X-ray crystallography of CRD-ligand complexes, glycoconjugate microarrays, site-directed mutagenesis of Lys-299/Lys-313","pmids":["21112338","20026605"],"confidence":"High","gaps":["Reconciliation with proposed second site unresolved","Physiological relevance of each glycan class not weighted"]},{"year":2010,"claim":"Identifying langerin as the primary fungal receptor recognizing mannan and beta-glucan extended its pathogen-sensing role to fungi.","evidence":"Recombinant langerin binding assays, LC-fungal interaction assays, anti-langerin blocking","pmids":["20097424"],"confidence":"High","gaps":["Downstream signaling/effector outcome not characterized","In vivo antifungal role not tested"]},{"year":2012,"claim":"Live-imaging dissection of a Rab11A/Myosin Vb/Rab11-FIP2 platform showed it acts at two spatially distinct steps—ERC sorting and plasma-membrane docking/fusion—refining the trafficking model for langerin.","evidence":"Live-cell FRET, FRAP, confocal and TIRF microscopy in langerin-expressing cells","pmids":["22420646"],"confidence":"High","gaps":["How langerin cargo selects this platform unknown","Link to Birbeck granule membrane curvature unresolved"]},{"year":2013,"claim":"Showing that common K313I and linked N288D polymorphisms shift glycan specificity and destabilize the Ca2+ site established natural genetic variation as a tuner of langerin recognition.","evidence":"Mutagenesis, glycan array, X-ray crystallography of polymorphic forms","pmids":["24217250"],"confidence":"High","gaps":["Physiological/clinical consequence of haplotypes untested","Effect on pathogen recognition in vivo unknown"]},{"year":2014,"claim":"Demonstrating caveolin-1-dependent uptake of CRD-captured HIV-1 trimers into lysosome-linked Birbeck granules defined the endocytic route underlying antiviral restriction.","evidence":"Anti-CRD antibody and soluble trimeric langerin blocking, caveolin-1 siRNA and pharmacological inhibition, HIV integration assay in primary LCs","pmids":["22364686","25551286","25070850"],"confidence":"High","gaps":["Relative contribution of clathrin vs caveolin pathways context-dependent","Trigger linking caveolar uptake to degradation unresolved"]},{"year":2015,"claim":"Establishing that langerin routes antigen to EEA1+ early endosomes to enhance MHC-I cross-presentation defined a distinct antigen-handling fate beyond pathogen degradation.","evidence":"Anti-langerin vs anti-dectin-1 antibody-coupled peptide delivery, EEA1 colocalization, CD8+ T-cell cross-presentation in primary LCs","pmids":["26456691"],"confidence":"High","gaps":["Switch between degradative and cross-presenting routing not defined","In vivo vaccine relevance untested"]},{"year":2015,"claim":"Identifying langerin as an entry receptor for influenza A virus, requiring internalization and using early endosomes, extended its receptor repertoire and showed glycan capture can promote rather than restrict infection.","evidence":"Lec2 CHO cells expressing langerin or endocytosis-defective mutant, replication assays, pathway inhibitors, endosomal markers","pmids":["26468543"],"confidence":"High","gaps":["Outcome (restriction vs entry) determinants across pathogens unclear","Role in primary LCs in vivo not addressed"]},{"year":2016,"claim":"NMR and MD analysis revealed an allosteric intradomain network coupling pH to Ca2+ affinity, providing the molecular mechanism for fast endosomal cargo release.","evidence":"NMR spectroscopy, molecular dynamics, site-directed mutagenesis of the CRD","pmids":["27560542"],"confidence":"High","gaps":["Coupling to trafficking machinery not demonstrated","Generality across ligand classes untested"]},{"year":2019,"claim":"Demonstrating langerin recognition of beta-GlcNAc on S. aureus wall teichoic acid, shaping cytokine responses, showed langerin discriminates bacterial species and tunes inflammation.","evidence":"LC-S. aureus assays, anti-langerin blocking, cytokine measurement, murine epicutaneous model with WTA mutants and human langerin transgene","pmids":["31088921","33591717"],"confidence":"High","gaps":["Signaling pathway from langerin to cytokine induction undefined","Why TarP vs TarS differ despite equal recognition unexplained"]},{"year":null,"claim":"It remains unresolved how langerin's glycan engagement is mechanistically transduced into downstream signaling and how cargo fate is switched between degradative Birbeck granules and cross-presenting early endosomes.","evidence":"No timeline discovery defines a langerin cytoplasmic signaling pathway or the molecular switch governing routing","pmids":[],"confidence":"Medium","gaps":["No cytoplasmic signaling effectors identified","Switch between degradation and cross-presentation routing undefined","Existence/function of a Ca2+-independent secondary glycan site unresolved (#27 vs #12)"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[6,22,24]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[3,6,34]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[12,13,25]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[11,12]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,3,23]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2,21,32]},{"term_id":"GO:0031410","term_label":"cytoplasmic 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Induces the formation of Birbeck granules (BGs); is a potent regulator of membrane superimposition and zippering. Binds to sulfated as well as mannosylated glycans, keratan sulfate (KS) and beta-glucans. Facilitates uptake of antigens and is involved in the routing and/or processing of antigen for presentation to T cells. Major receptor on primary Langerhans cells for Candida species, Saccharomyces species, and Malassezia furfur. Protects against human immunodeficiency virus-1 (HIV-1) infection. Binds to high-mannose structures present on the envelope glycoprotein which is followed by subsequent targeting of the virus to the Birbeck granules leading to its rapid degradation","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/Q9UJ71/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CD207","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":77,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CD207","total_profiled":1310},"omim":[{"mim_id":"620105","title":"C-TYPE LECTIN DOMAIN FAMILY 4, MEMBER F; CLEC4F","url":"https://www.omim.org/entry/620105"},{"mim_id":"619500","title":"DEAFNESS, AUTOSOMAL DOMINANT 81; DFNA81","url":"https://www.omim.org/entry/619500"},{"mim_id":"615429","title":"DEAFNESS, AUTOSOMAL RECESSIVE 88; DFNB88","url":"https://www.omim.org/entry/615429"},{"mim_id":"615427","title":"ELMO/CED12 DOMAIN-CONTAINING PROTEIN 3; ELMOD3","url":"https://www.omim.org/entry/615427"},{"mim_id":"613393","title":"BIRBECK GRANULE DEFICIENCY","url":"https://www.omim.org/entry/613393"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Cytosol","reliability":"Uncertain"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skin 1","ntpm":82.8}],"url":"https://www.proteinatlas.org/search/CD207"},"hgnc":{"alias_symbol":["Langerin","CLEC4K"],"prev_symbol":[]},"alphafold":{"accession":"Q9UJ71","domains":[{"cath_id":"3.10.100.10","chopping":"202-323","consensus_level":"high","plddt":95.7306,"start":202,"end":323}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UJ71","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UJ71-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UJ71-F1-predicted_aligned_error_v6.png","plddt_mean":86.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CD207","jax_strain_url":"https://www.jax.org/strain/search?query=CD207"},"sequence":{"accession":"Q9UJ71","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UJ71.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UJ71/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UJ71"}},"corpus_meta":[{"pmid":"10661407","id":"PMC_10661407","title":"Langerin, a novel C-type lectin 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Inhibition of endocytosis produces open-ended Birbeck granule-like structures at the plasma membrane, while inhibition of recycling causes Birbeck granules to merge with a tubular endosomal network. ARF proteins are implicated in Langerin trafficking.\",\n      \"method\": \"Drug inhibition of endocytosis/recycling, immunofluorescence, electron microscopy, subcellular fractionation in primary human LCs\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal pharmacological perturbations with direct morphological and biochemical readouts in primary cells\",\n      \"pmids\": [\"11809842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The extracellular region of langerin exists as a stable trimer held together by a coiled-coil of alpha-helices formed by the neck region. The langerin CRD shows specificity for mannose, GlcNAc, and fucose, but only the trimeric extracellular domain binds glycoprotein ligands. Langerin binds mammalian high-mannose oligosaccharides and mannose-containing structures on yeast invertase but not complex glycans. Full-length langerin mediates efficient uptake and degradation of mannosylated neoglycoprotein ligands, with pH-dependent ligand release involving CRD-neck interactions.\",\n      \"method\": \"Analytical ultracentrifugation, circular dichroism spectroscopy, sugar binding assays, transfection of full-length langerin in rat fibroblasts, endocytosis assay with mannosylated neoglycoprotein\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple biophysical methods plus functional cell-based uptake assay in single rigorous study\",\n      \"pmids\": [\"12626394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Langerhans cells utilize langerin to present nonpeptide antigens of Mycobacterium leprae to T cell clones in a CD1a-restricted and langerin-dependent manner; LC-like DCs were more efficient at CD1a-restricted antigen presentation than monocyte-derived DCs.\",\n      \"method\": \"Antigen presentation assay with LC-derived DCs and T cell clones, anti-langerin antibody blocking, freshly isolated epidermal LCs from leprosy patients\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional blocking with anti-langerin antibody plus multiple cell types tested, replicated with primary cells\",\n      \"pmids\": [\"14991068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Genetic disruption of langerin abolishes Birbeck granules in Langerhans cells without altering LC numbers, morphology, antigen capture, migration to lymph nodes, phenotypic maturation, OVA presentation on MHC II to CD4+ T cells, or cross-presentation on MHC I to CD8+ T cells. Langerin and Birbeck granules are dispensable for these LC functions.\",\n      \"method\": \"Langerin knockout mouse (langerin-/- on C57BL/6), electron microscopy, FACS, antigen presentation assays, in vivo pathogen challenge\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — clean knockout with multiple orthogonal functional readouts in a well-controlled genetic model\",\n      \"pmids\": [\"15601833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Langerin prevents HIV-1 transmission by Langerhans cells: HIV-1 captured by langerin is internalized into Birbeck granules and degraded. Inhibition of langerin allowed LC infection and subsequent HIV-1 transmission. LCs also inhibited T-cell infection by viral clearance through langerin.\",\n      \"method\": \"Primary human LC HIV-1 infection assays, anti-langerin blocking antibody, T-cell transmission assay, fluorescence microscopy\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain/loss-of-function with antibody blocking, primary human cells, multiple functional readouts, high-impact replication\",\n      \"pmids\": [\"17334373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rab11A controls the biogenesis of Birbeck granules by regulating Langerin recycling and stability; dominant-negative Rab11A or Rab11A depletion causes missorting of Langerin to lysosomal compartments and abrogates BG formation. Loss of Rab11A-interacting protein RCP (but not Rip11) also modestly affects Langerin stability and BG biogenesis.\",\n      \"method\": \"Dominant-negative Rab11A overexpression, siRNA Rab11A depletion, siRNA RCP/Rip11 depletion, immunofluorescence, electron microscopy in Langerin-transfected cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple genetic perturbations (dominant-negative + siRNA) with direct morphological and biochemical readouts\",\n      \"pmids\": [\"17538027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of the langerin CRD reveals a fold similar to DC-SIGN with two sugar-binding sites: one Ca2+-dependent (conserved in C-type lectins) binding mannose, and a second novel Ca2+-independent site; complexes with mannose and maltose resolved at 1.6 Å and 2.1 Å respectively.\",\n      \"method\": \"X-ray crystallography (apo at 2.5 Å; mannose complex at 1.6 Å; maltose complex at 2.1 Å) of recombinant langerin CRD\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structures with bound ligands; single lab but rigorous structural method\",\n      \"pmids\": [\"18061677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of trimeric langerin extracellular fragment at high resolution shows the neck region forms a coiled-coil of alpha-helices; multiple interactions between neck and CRDs create a rigid trimer with three Ca2+-dependent sugar-binding sites separated by 42 Å. High-mannose oligosaccharides are the best trimeric langerin ligands by glycan array screening.\",\n      \"method\": \"X-ray crystallography of trimeric langerin extracellular fragment, analytical ultracentrifugation, glycan array screening\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus biophysical characterization plus glycan array; multiple orthogonal methods\",\n      \"pmids\": [\"20181944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of the human langerin CRD solved at 1.5 Å; molecular modeling of gp120 high-mannose binding was validated. Truncation and mutagenesis studies in transfected fibroblasts identified the role of the CRD in membrane zipping during Birbeck granule formation, with some contribution from the cytoplasmic domain.\",\n      \"method\": \"X-ray crystallography (1.5 Å), molecular modeling, truncation and point-mutant transfection in fibroblasts, electron microscopy\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus structure-guided mutagenesis with functional BG-formation readout\",\n      \"pmids\": [\"19175323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Langerin has dual specificity: outstanding affinity for galactose-6-sulfated oligosaccharides (including keratan sulfate) through an extended binding site, and preserved mannose-binding activity. Mutagenesis identified Lys-299 and Lys-313 as forming the extended binding site for sulfated glycans.\",\n      \"method\": \"Comprehensive glycoconjugate microarray, quantitative frontal affinity chromatography, site-directed mutagenesis of Lys-299 and Lys-313\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — site-directed mutagenesis plus two orthogonal binding assays identifying specific residues\",\n      \"pmids\": [\"20026605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Crystal structures of human langerin CRD bound to oligomannose compounds, blood group B antigen, and a β-glucan fragment reveal that all bind through a single Ca2+-dependent site via coordination of vicinal hydroxyl groups. Oligomannose binds through a single mannose residue; β-glucan (Glcβ1-3Glcβ1-3Glc) binds through a single glucose residue; fucose of blood group B binds Ca2+ site. 6-sulfated galactose coordinates Ca2+ via equatorial 3-OH and axial 4-OH, with salt bridges to two lysine residues. No evidence for a second Ca2+-independent binding site was found in these structural studies.\",\n      \"method\": \"X-ray crystallography of CRD–ligand complexes, bacterial polysaccharide microarray screening\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple high-resolution crystal structures with diverse ligands; single rigorous study with multiple orthogonal approaches\",\n      \"pmids\": [\"21112338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Langerin is the primary fungal receptor on Langerhans cells, recognizing both mannan and β-glucan structures on fungal cell walls. Langerin interacts with Candida and Saccharomyces species and Malassezia furfur, but only weakly with Cryptococcus species; anti-langerin antibody blocks LC–fungal interactions.\",\n      \"method\": \"Binding assays with recombinant langerin, LC fungal interaction assays, anti-langerin antibody blocking\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional blocking with anti-langerin antibody plus binding characterization with panel of fungi\",\n      \"pmids\": [\"20097424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The Birbeck granule-inducing mutation W264R in the langerin CRD (substitution of tryptophan by arginine at position 264) abolishes sugar-binding activity of langerin, and heterozygous presence of this mutation in a human is associated with absence of Birbeck granules.\",\n      \"method\": \"Human genetic analysis (heterozygous point mutation), expression of mutant Langerin in fibroblasts, sugar-binding assay\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — natural human mutation studied with transfection and direct functional sugar-binding assay\",\n      \"pmids\": [\"15816828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SNPs in the langerin CRD reduce affinity for mannose and decrease stability of the extracellular domain; the W264R mutation abolishes sugar-binding activity. All four common langerin haplotypes mediate endocytosis of neoglycoprotein ligands in transfected fibroblasts.\",\n      \"method\": \"Expression of polymorphic full-length langerin in fibroblasts, sugar-binding assays, differential scanning calorimetry on extracellular domain fragments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biophysical assays (DSC) plus cell-based endocytosis with multiple haplotypes; rigorous structure-function study\",\n      \"pmids\": [\"16567809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A common SNP changing Lys-313 to isoleucine abolishes langerin binding to oligosaccharides with terminal 6SO4-Gal and enhances binding to terminal GlcNAc. This K313I SNP is tightly linked to N288D, which destabilizes the Ca2+-binding site and reduces overall glycan affinity.\",\n      \"method\": \"Mutagenesis, glycan array screening, X-ray crystallography of polymorphic forms\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus mutagenesis plus glycan array; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"24217250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Mouse langerin protein forms multimers and binds mannan-agarose (Ca2+-dependent mannose binding); expression in fibroblasts induces Birbeck granule-like structures. A point mutation F244L in the CRD transforms BG into cored tubule-like structures in transfectants.\",\n      \"method\": \"Recombinant protein expression, mannan-agarose binding assay, cDNA transfection in fibroblasts, electron microscopy\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution in fibroblasts with mutagenesis and direct morphological readout\",\n      \"pmids\": [\"11777972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mouse langerin, SIGNR1, and SIGNR3 can each be internalized upon cell-surface expression in transfected non-macrophage cells; mLangerin (unlike mDC-SIGN) mediates uptake of FITC-dextran and zymosan, with distinct carbohydrate recognition properties. FITC-dextran uptake by Langerin is blocked by mannan.\",\n      \"method\": \"Transfection of tag-labeled lectins in cell lines, FITC-dextran/zymosan uptake assays, blocking with mannan/EDTA\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional uptake assays in transfected cells with specific inhibitors; comparative study, single lab\",\n      \"pmids\": [\"15096474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Langerin binds a Lewis X-related sequence with sulfate at position 6 of the terminal galactose as its dominant specificity in carbohydrate array screening, distinguishing it from SIGN-R1 and SIGN-R3 which prefer mannose/fucose structures.\",\n      \"method\": \"Carbohydrate array probing with soluble IgG-Fc chimeras of langerin, SIGN-R1, SIGN-R3; cell-based uptake assays\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — carbohydrate array plus cell-based assay, single study comparing multiple lectins\",\n      \"pmids\": [\"15136555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A Rab11A/Myosin Vb/Rab11-FIP2 platform regulates langerin trafficking at two distinct sites: at a sorting site in the endosomal recycling compartment (ERC) where transport vesicles form, and at the late stage of docking/tethering and fusion of langerin recycling vesicles to the plasma membrane.\",\n      \"method\": \"Live-cell FRET, fast FRAP, fast confocal and TIRF microscopy in langerin-expressing cells\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple live-imaging modalities (FRET, FRAP, TIRF) identifying spatiotemporal platform function for a defined cargo\",\n      \"pmids\": [\"22420646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Langerin traffic and Birbeck granule formation were reconstituted in a human melanoma cell line (M10-22E) transfected with Langerin; Langerin distributes between the Rab11+ endosomal recycling compartment and the plasma membrane, and drives BG biogenesis in the endosomal recycling compartment. Interruption of endocytosis or recycling redistributes intracellular Langerin and alters BG morphology.\",\n      \"method\": \"Stable transfection of melanoma cells, immunofluorescence, electron microscopy, pharmacological inhibition of endocytosis/recycling\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution in cell line with pharmacological perturbations and direct morphological readouts\",\n      \"pmids\": [\"15191545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Langerin on Langerhans cells captures HIV-1 as surface trimers through its carbohydrate recognition domain (CRD), preferentially binding gp140 and whole HIV particles; both phases of HIV transfer from epidermal LCs to T cells are inhibited by anti-langerin CRD antibody or soluble trimeric langerin extracellular domain, which did not inhibit direct HIV infection of T cells.\",\n      \"method\": \"HIV transfer assays with primary eLCs and Mutz-3 LCs, anti-langerin CRD mAb blocking, soluble trimeric langerin inhibition, cross-linking experiments\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple inhibitors (antibody + soluble receptor) applied to primary cells plus cell line model with specific readout\",\n      \"pmids\": [\"25070850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Langerin-mediated HIV-1 uptake in primary human LCs is caveolin-1-dependent; langerin and caveolin-1 co-localize at the cell membrane and in vesicles; Birbeck granules are langerin/caveolin-1-positive vesicles linked to the lysosomal degradation pathway. Inhibition of caveolar endocytosis or siRNA silencing of caveolin-1 increases HIV-1 integration and infection; inhibition of clathrin-mediated endocytosis does not affect HIV-1 restriction.\",\n      \"method\": \"Co-localization microscopy, caveolar endocytosis inhibition, caveolin-1 siRNA silencing, clathrin inhibition, HIV-1 integration assay in primary LCs\",\n      \"journal\": \"Retrovirology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple perturbations (pharmacological + siRNA) with primary human cells and specific molecular readout (HIV integration)\",\n      \"pmids\": [\"25551286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Langerin functions as an authentic receptor mediating attachment and infectious entry of influenza A virus (IAV) via lectin-mediated recognition of mannose-rich glycans on viral hemagglutinin. Endocytosis-defective langerin mutant bound IAV but prevented infection, confirming internalization is required. Langerin-mediated IAV infection is pH- and dynamin-dependent, uses clathrin- and caveolin-mediated endocytic pathways, and utilizes early (Rab5+) but not late (Rab7+) endosomes.\",\n      \"method\": \"Lec2 SIA-deficient CHO cells expressing langerin or endocytosis-defective langerin mutant; viral replication, mRNA transcription, protein synthesis assays; pathway inhibitors; endosomal marker colocalization\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in SIA-deficient cells with endocytosis-defective mutant plus pathway characterization with specific inhibitors and endosomal markers\",\n      \"pmids\": [\"26468543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Human langerin on Langerhans cells directly recognizes Staphylococcus aureus through β-N-acetylglucosamine (GlcNAc) modifications on wall teichoic acid (WTA), discriminating S. aureus from other staphylococci. The S. aureus WTA glycoprofile influences the level of proinflammatory cytokines produced by LCs. In a murine epicutaneous model, S. aureus strongly upregulated Cxcl1, Il6, and Il17, requiring both human langerin and WTA β-GlcNAc.\",\n      \"method\": \"LC-S. aureus interaction assays, anti-langerin antibody blocking, cytokine measurement, murine epicutaneous infection model with human langerin-expressing and WTA-mutant S. aureus strains\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro blocking plus in vivo murine model with genetic controls (WTA mutants + human langerin transgene)\",\n      \"pmids\": [\"31088921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Langerin specifically recognizes β-GlcNAc (both β1,4 and β1,3 linkages produced by TarS and TarP) but not α1,4-GlcNAc (TarM) on S. aureus WTA; β-GlcNAc is sufficient for langerin binding as demonstrated with chemically synthesized WTA molecules. TarP-modified S. aureus induced increased cytokine production and LC maturation compared to TarS-modified bacteria despite similar langerin recognition.\",\n      \"method\": \"Genetically modified S. aureus strains, in vitro generated LC binding/activation assays, chemically synthesized WTA molecules, cytokine measurements\",\n      \"journal\": \"ACS infectious diseases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — chemical synthesis of defined ligands plus genetic bacterial mutants with functional cellular readouts\",\n      \"pmids\": [\"33591717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Langerin recognizes glycosaminoglycans (GAGs) through a novel Ca2+-independent binding site distinct from the canonical Ca2+-dependent CRD site; this site is only detectable in the trimeric extracellular domain and is specific for 6-O-sulfation and iduronic acid content rather than net charge.\",\n      \"method\": \"Molecular modeling, surface plasmon resonance-like binding assays, comparison of GAG vs. mannose binding in trimeric vs. monomeric langerin\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biophysical binding characterization plus modeling; finding contrasts with Feinberg 2010 crystal structure showing no second site, creating partial conflict\",\n      \"pmids\": [\"23226363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"An allosteric intradomain network in the langerin CRD modulates Ca2+ affinity depending on pH, promoting fast ligand release; two loops undergo coupled motions controlling Ca2+ binding/release over multiple time scales. Site-directed mutagenesis confirmed the allosteric network.\",\n      \"method\": \"NMR spectroscopy, molecular dynamics simulations, site-directed mutagenesis of the CRD\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR plus MD simulations plus mutagenesis; multiple orthogonal approaches in one study\",\n      \"pmids\": [\"27560542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Human and murine langerin share identical three-dimensional structures and recognize simple ligands identically, but screening >300 bacterial polysaccharides revealed highly diverging avidity and selectivity for large complex glycans; a highly variable surface adjacent to the canonical binding site likely forms a secondary interaction site for large glycans.\",\n      \"method\": \"Bacterial polysaccharide microarray (>300 compounds), X-ray crystallography of murine langerin, structural/evolutionary conservation analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure of murine form plus comprehensive carbohydrate screening; identifies species-specific recognition divergence\",\n      \"pmids\": [\"27903635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Anti-Langerin antibody targeting of splenic CD8+ DCs in vivo mediates efficient antigen presentation to both CD8+ and CD4+ T cells (4–8 cycles of division in 3 days); peptide–MHC I and II complexes persist for days. CD8+ DCs expressing Langerin are located predominantly in the marginal zone of mouse spleen, not in T cell areas.\",\n      \"method\": \"Antibody-targeted antigen delivery in vivo (hybrid anti-Langerin mAb containing OVA), T-cell division assay, immunolabeling of spleen sections\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo antigen targeting with dose-response plus histological localization; replicated in related studies\",\n      \"pmids\": [\"18322168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Langerin captures measles virus on human primary Langerhans cells; immature LCs present MV antigens via HLA class II to CD4+ T cells but are not susceptible to productive MV infection and cannot cross-present exogenous MV to CD8+ T cells. Mature LCs can be infected by MV and present endogenously synthesized viral antigens to CD8+ T cells, but neither immature nor mature LCs cross-present MV.\",\n      \"method\": \"Primary human LC infection assays, anti-langerin antibody blocking, MHC class I/II antigen presentation assays with MV-specific T cells, UV-inactivated MV cross-presentation assay\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — antibody blocking with primary human cells and defined T-cell readouts; multiple antigen presentation pathways tested\",\n      \"pmids\": [\"21739428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Langerin on primary human Langerhans cells routes internalized antigen to early endosomes (EEA1+), enhancing cross-presentation to CD8+ T cells; anti-langerin antibody-modified synthetic long peptides, but not anti-dectin-1, enhanced cross-presentation. Langerin-mediated internalization routes antigens to less proteolytic early endosomal compartments.\",\n      \"method\": \"Anti-langerin and anti-dectin-1 antibody-coupled SLP antigen delivery, early endosome co-localization (EEA1), CD8+ T-cell cross-presentation assay with primary human LCs\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor-specific targeting with subcellular localization readout and functional T-cell assay using primary cells\",\n      \"pmids\": [\"26456691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Langerin recognizes hyaluronic acid on dendritic cells, mediating clustering (adhesion) between Langerhans cells and DCs; this LC-DC clustering leads to DC maturation and facilitates antigen transfer of HIV-1 to DCs for subsequent CD8+ T-cell activation. Hyaluronidase-2 upregulation by DC maturation degrades hyaluronic acid and abrogates LC-DC interactions.\",\n      \"method\": \"Anti-langerin antibody blocking, hyaluronic acid removal from DCs, LC-DC clustering assay, HIV-1 antigen transfer assay, CD8+ T-cell activation readout\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional blocking assays with defined ligand removal and multiple readouts; single lab\",\n      \"pmids\": [\"26170391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Langerin (CD207) serves as a phagocytic receptor for Yersinia pestis; Y. pestis invades Langerhans cells and langerin-transfected cells via interaction of core oligosaccharides with langerin. Shielding or truncating bacterial core oligosaccharides or adding purified langerin, anti-CD207 antibody, or competing oligosaccharides reduces invasion. Langerin-mediated uptake promotes Y. pestis dissemination to lymph nodes in a murine model.\",\n      \"method\": \"Y. pestis invasion assays with LCs and langerin transfectants, inhibitor competition assays (purified langerin, anti-CD207, oligosaccharides), murine in vivo infection model\",\n      \"journal\": \"Immunology and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based invasion assay with multiple blocking strategies plus in vivo dissemination model; single lab\",\n      \"pmids\": [\"25829141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"HPV 16 virus-like particles colocalize with langerin on the cell surface and in cytoplasmic vesicles of Langerhans cells by electron microscopy, and exhibit faster entry kinetics in LCs compared to DCs, entering near the nuclear membrane within 10 minutes; both LCs and DCs internalize HPV16 VLPs via a clathrin-dependent pathway into endosomal vesicles.\",\n      \"method\": \"Electron microscopy colocalization, time-course internalization experiments, clathrin inhibitor studies with HPV16 VLPs in primary LCs and DCs\",\n      \"journal\": \"The Journal of general virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EM colocalization plus inhibitor studies; single lab, single virus type\",\n      \"pmids\": [\"15831940\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CD207/Langerin is a type II transmembrane C-type lectin that functions as a trimeric (coiled-coil neck stabilized) endocytic pattern recognition receptor on Langerhans cells, recognizing diverse glycan ligands (mannose, GlcNAc, fucose, 6-sulfated galactose, β-glucan) via a primary Ca2+-dependent CRD site and possibly secondary sites; ligand capture triggers clathrin- and caveolin-mediated internalization routed through Rab11A/Myosin Vb/Rab11-FIP2-regulated recycling endosomes, where Langerin accumulation drives the biogenesis of Birbeck granules as specialized lysosomal-linked compartments that degrade captured pathogens (e.g., HIV-1, fungi), while langerin-mediated routing to early endosomes can alternatively enhance MHC-I cross-presentation; an allosteric intradomain network modulates Ca2+ affinity in a pH-dependent manner to promote cargo release, and specific natural polymorphisms (K313I, N288D, W264R) alter glycan specificity, reduce stability, or abolish both sugar binding and Birbeck granule formation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CD207/Langerin is a type II Ca2+-dependent C-type lectin of Langerhans cells (LCs) that acts as an endocytic pattern-recognition receptor and the architect of Birbeck granules, specialized membrane compartments it generates by inducing membrane superimposition and zippering [#0, #2]. Its extracellular region assembles into a rigid trimer stabilized by a coiled-coil neck, an arrangement required for high-avidity capture of glycoprotein ligands; the trimeric protein binds high-mannose oligosaccharides optimally, and full-length langerin mediates uptake and degradation of mannosylated cargo with pH-dependent release governed by CRD-neck interactions [#3, #9]. Glycan recognition occurs primarily at a single Ca2+-dependent CRD site that accommodates diverse ligands—mannose, GlcNAc, fucose-bearing blood group antigens, beta-glucan, and 6-sulfated galactose—through coordination of vicinal hydroxyls, with lysine residues (Lys-299, Lys-313) forming an extended subsite for sulfated glycans [#11, #12], while an allosteric intradomain network couples pH to Ca2+ affinity to drive fast cargo release [#28]. After ligand capture langerin internalizes by receptor-mediated endocytosis and is routed through the Rab11A-positive endosomal recycling compartment, where a Rab11A/Myosin Vb/Rab11-FIP2 platform controls its sorting, recycling and stability; loss of Rab11A missorts langerin to lysosomes and abolishes Birbeck granule biogenesis [#7, #20, #21]. Functionally, langerin captures and degrades pathogens—it internalizes HIV-1 into Birbeck granules via caveolin-1-dependent uptake to restrict LC infection and T-cell transmission [#6, #23], serves as the principal fungal receptor recognizing mannan and beta-glucan [#13], discriminates Staphylococcus aureus through beta-GlcNAc on wall teichoic acid to shape proinflammatory cytokine output [#25, #26], and acts as an entry receptor for influenza A virus through mannose-rich hemagglutinin glycans [#24]. Langerin also directs antigen handling: routing cargo to early endosomes enhances MHC-I cross-presentation [#32], and it contributes to CD1a-restricted presentation of mycobacterial lipids [#4]. Birbeck granules themselves are dispensable for core LC antigen-presentation functions [#5]. Natural CRD polymorphisms tune or abrogate function—W264R abolishes sugar binding and Birbeck granule formation, while the linked K313I/N288D variants redirect glycan specificity and destabilize the Ca2+ site [#14, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing langerin as a distinct, rapidly internalized LC surface molecule defined the protein biochemically and showed its trafficking diverged from classical MHC II antigen-loading routes.\",\n      \"evidence\": \"Monoclonal antibody generation, immunoprecipitation, internalization and colocalization assays\",\n      \"pmids\": [\"10508244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No molecular identity of the internalization route\", \"Ligand and function unknown at this stage\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Cloning langerin and demonstrating that its expression alone induces Birbeck granules in fibroblasts established it as both a mannose-binding C-type lectin and the causal driver of these LC-specific organelles.\",\n      \"evidence\": \"cDNA transfection into fibroblasts, electron microscopy, antibody internalization assay\",\n      \"pmids\": [\"10661407\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of membrane zippering undefined\", \"Physiological glycan ligands not mapped\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showing Birbeck granules are subdomains of the endosomal recycling compartment forming where langerin accumulates placed langerin trafficking within defined endocytic and recycling pathways.\",\n      \"evidence\": \"Pharmacological inhibition of endocytosis/recycling, immunofluorescence, EM, fractionation in primary human LCs\",\n      \"pmids\": [\"11809842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific Rab/motor machinery not yet identified\", \"ARF involvement only implicated\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defining the trimeric architecture stabilized by the coiled-coil neck and its requirement for glycoprotein binding linked langerin oligomerization to ligand avidity and pH-dependent release.\",\n      \"evidence\": \"Analytical ultracentrifugation, circular dichroism, sugar-binding and neoglycoprotein endocytosis assays\",\n      \"pmids\": [\"12626394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the trimer not yet resolved\", \"Secondary binding sites not addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Knockout of langerin in mice showed Birbeck granules are dispensable for canonical LC antigen-capture and presentation, separating the organelle-forming role from general LC immune function.\",\n      \"evidence\": \"Langerin-/- mouse, EM, FACS, MHC I/II antigen presentation assays, in vivo challenge\",\n      \"pmids\": [\"15601833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not test pathogen-specific capture roles\", \"Mouse vs human functional divergence not addressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identifying Rab11A as the master regulator of langerin recycling, stability and Birbeck granule biogenesis connected the receptor to a defined endosomal sorting machinery.\",\n      \"evidence\": \"Dominant-negative Rab11A, siRNA of Rab11A and RCP/Rip11, immunofluorescence, EM in transfected cells\",\n      \"pmids\": [\"17538027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Motor and tethering components not yet defined\", \"Sorting signals on langerin not mapped\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrating that langerin captures and degrades HIV-1 in Birbeck granules to prevent LC infection and transmission established a protective antiviral function for the receptor.\",\n      \"evidence\": \"Primary human LC HIV-1 infection and transmission assays, anti-langerin blocking antibody\",\n      \"pmids\": [\"17334373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endocytic pathway mediating uptake not yet defined\", \"Viral glycan epitope not yet identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"High-resolution crystal structures of the CRD and trimeric ectodomain revealed three Ca2+-dependent sugar sites 42 Å apart and confirmed high-mannose glycans as optimal ligands, providing the structural basis for multivalent recognition.\",\n      \"evidence\": \"X-ray crystallography of CRD and trimeric fragment, AUC, glycan array, structure-guided mutagenesis\",\n      \"pmids\": [\"18061677\", \"20181944\", \"19175323\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Existence of a Ca2+-independent second site debated\", \"Structural basis of membrane zipping inferred indirectly\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Comprehensive structural and array studies established a single Ca2+-dependent site as the binding hub for diverse glycans (oligomannose, beta-glucan, blood group B, 6-sulfated galactose) and mapped lysine-dependent recognition of sulfated sugars.\",\n      \"evidence\": \"X-ray crystallography of CRD-ligand complexes, glycoconjugate microarrays, site-directed mutagenesis of Lys-299/Lys-313\",\n      \"pmids\": [\"21112338\", \"20026605\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation with proposed second site unresolved\", \"Physiological relevance of each glycan class not weighted\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying langerin as the primary fungal receptor recognizing mannan and beta-glucan extended its pathogen-sensing role to fungi.\",\n      \"evidence\": \"Recombinant langerin binding assays, LC-fungal interaction assays, anti-langerin blocking\",\n      \"pmids\": [\"20097424\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling/effector outcome not characterized\", \"In vivo antifungal role not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Live-imaging dissection of a Rab11A/Myosin Vb/Rab11-FIP2 platform showed it acts at two spatially distinct steps—ERC sorting and plasma-membrane docking/fusion—refining the trafficking model for langerin.\",\n      \"evidence\": \"Live-cell FRET, FRAP, confocal and TIRF microscopy in langerin-expressing cells\",\n      \"pmids\": [\"22420646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How langerin cargo selects this platform unknown\", \"Link to Birbeck granule membrane curvature unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showing that common K313I and linked N288D polymorphisms shift glycan specificity and destabilize the Ca2+ site established natural genetic variation as a tuner of langerin recognition.\",\n      \"evidence\": \"Mutagenesis, glycan array, X-ray crystallography of polymorphic forms\",\n      \"pmids\": [\"24217250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological/clinical consequence of haplotypes untested\", \"Effect on pathogen recognition in vivo unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrating caveolin-1-dependent uptake of CRD-captured HIV-1 trimers into lysosome-linked Birbeck granules defined the endocytic route underlying antiviral restriction.\",\n      \"evidence\": \"Anti-CRD antibody and soluble trimeric langerin blocking, caveolin-1 siRNA and pharmacological inhibition, HIV integration assay in primary LCs\",\n      \"pmids\": [\"22364686\", \"25551286\", \"25070850\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of clathrin vs caveolin pathways context-dependent\", \"Trigger linking caveolar uptake to degradation unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Establishing that langerin routes antigen to EEA1+ early endosomes to enhance MHC-I cross-presentation defined a distinct antigen-handling fate beyond pathogen degradation.\",\n      \"evidence\": \"Anti-langerin vs anti-dectin-1 antibody-coupled peptide delivery, EEA1 colocalization, CD8+ T-cell cross-presentation in primary LCs\",\n      \"pmids\": [\"26456691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch between degradative and cross-presenting routing not defined\", \"In vivo vaccine relevance untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying langerin as an entry receptor for influenza A virus, requiring internalization and using early endosomes, extended its receptor repertoire and showed glycan capture can promote rather than restrict infection.\",\n      \"evidence\": \"Lec2 CHO cells expressing langerin or endocytosis-defective mutant, replication assays, pathway inhibitors, endosomal markers\",\n      \"pmids\": [\"26468543\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Outcome (restriction vs entry) determinants across pathogens unclear\", \"Role in primary LCs in vivo not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"NMR and MD analysis revealed an allosteric intradomain network coupling pH to Ca2+ affinity, providing the molecular mechanism for fast endosomal cargo release.\",\n      \"evidence\": \"NMR spectroscopy, molecular dynamics, site-directed mutagenesis of the CRD\",\n      \"pmids\": [\"27560542\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coupling to trafficking machinery not demonstrated\", \"Generality across ligand classes untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating langerin recognition of beta-GlcNAc on S. aureus wall teichoic acid, shaping cytokine responses, showed langerin discriminates bacterial species and tunes inflammation.\",\n      \"evidence\": \"LC-S. aureus assays, anti-langerin blocking, cytokine measurement, murine epicutaneous model with WTA mutants and human langerin transgene\",\n      \"pmids\": [\"31088921\", \"33591717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling pathway from langerin to cytokine induction undefined\", \"Why TarP vs TarS differ despite equal recognition unexplained\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how langerin's glycan engagement is mechanistically transduced into downstream signaling and how cargo fate is switched between degradative Birbeck granules and cross-presenting early endosomes.\",\n      \"evidence\": \"No timeline discovery defines a langerin cytoplasmic signaling pathway or the molecular switch governing routing\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No cytoplasmic signaling effectors identified\", \"Switch between degradation and cross-presentation routing undefined\", \"Existence/function of a Ca2+-independent secondary glycan site unresolved (#27 vs #12)\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [6, 22, 24]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [3, 6, 34]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [12, 13, 25]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 3, 23]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 21, 32]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2, 7, 23]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [6, 23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 6, 13, 25, 30]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 7, 20, 21]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 24, 34]}\n    ],\n    \"complexes\": [\"Birbeck granule\", \"Langerin trimer (coiled-coil neck)\"],\n    \"partners\": [\"RAB11A\", \"MYO5B\", \"RAB11FIP2\", \"RCP/RAB11FIP1\", \"CAV1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}