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- PDB-9ohu: CD1c presenting GM3 ganglioside -

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Basic information

Entry
Database: PDB / ID: 9ohu
TitleCD1c presenting GM3 ganglioside
Components
  • Beta-2-microglobulin
  • T-cell surface glycoprotein CD1c/T-cell surface glycoprotein CD1b chimeric protein
KeywordsLIPID BINDING PROTEIN / CD1c / lipid mediated immunity / lipid antigen presentation / GM3 / ganglioside
Function / homology
Function and homology information


negative regulation of receptor binding / early endosome lumen / Nef mediated downregulation of MHC class I complex cell surface expression / DAP12 interactions / transferrin transport / cellular response to iron ion / Endosomal/Vacuolar pathway / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / peptide antigen assembly with MHC class II protein complex / cellular response to iron(III) ion ...negative regulation of receptor binding / early endosome lumen / Nef mediated downregulation of MHC class I complex cell surface expression / DAP12 interactions / transferrin transport / cellular response to iron ion / Endosomal/Vacuolar pathway / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / peptide antigen assembly with MHC class II protein complex / cellular response to iron(III) ion / negative regulation of forebrain neuron differentiation / MHC class II protein complex / antigen processing and presentation of exogenous protein antigen via MHC class Ib, TAP-dependent / ER to Golgi transport vesicle membrane / peptide antigen assembly with MHC class I protein complex / regulation of iron ion transport / regulation of erythrocyte differentiation / HFE-transferrin receptor complex / response to molecule of bacterial origin / MHC class I peptide loading complex / T cell mediated cytotoxicity / positive regulation of T cell cytokine production / antigen processing and presentation of endogenous peptide antigen via MHC class I / antigen processing and presentation of exogenous peptide antigen via MHC class II / positive regulation of immune response / MHC class I protein complex / peptide antigen binding / positive regulation of T cell activation / negative regulation of neurogenesis / positive regulation of receptor-mediated endocytosis / cellular response to nicotine / positive regulation of T cell mediated cytotoxicity / multicellular organismal-level iron ion homeostasis / specific granule lumen / phagocytic vesicle membrane / recycling endosome membrane / Interferon gamma signaling / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / negative regulation of epithelial cell proliferation / MHC class II protein complex binding / Modulation by Mtb of host immune system / late endosome membrane / sensory perception of smell / positive regulation of cellular senescence / tertiary granule lumen / DAP12 signaling / T cell differentiation in thymus / negative regulation of neuron projection development / ER-Phagosome pathway / protein refolding / early endosome membrane / protein homotetramerization / amyloid fibril formation / intracellular iron ion homeostasis / learning or memory / endoplasmic reticulum lumen / Amyloid fiber formation / Golgi membrane / lysosomal membrane / external side of plasma membrane / focal adhesion / Neutrophil degranulation / SARS-CoV-2 activates/modulates innate and adaptive immune responses / structural molecule activity / endoplasmic reticulum / Golgi apparatus / protein homodimerization activity / extracellular space / extracellular exosome / extracellular region / identical protein binding / membrane / plasma membrane / cytosol
Similarity search - Function
Beta-2-Microglobulin / : / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin C-Type / Immunoglobulin C1-set / Immunoglobulin C1-set domain / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold
Similarity search - Domain/homology
: / : / 2-(cyclohexylazaniumyl)ethanesulfonate / MALONIC ACID / Beta-2-microglobulin
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.9 Å
AuthorsCao, T.P. / Rossjohn, J. / Shahine, A.
Funding support Australia, 1items
OrganizationGrant numberCountry
Australian Research Council (ARC)DE210101031 Australia
CitationJournal: Nat Commun / Year: 2025
Title: Sideways lipid presentation by the antigen-presenting molecule CD1c.
Authors: Cao, T.P. / Liao, G.R. / Cheng, T.Y. / Chen, Y. / Ciacchi, L. / Fulford, T.S. / Farquhar, R. / Kollmorgen, J. / Mayfield, J.A. / Uldrich, A.P. / Ng, E.Z.Q. / Ogg, G.S. / Godfrey, D.I. / ...Authors: Cao, T.P. / Liao, G.R. / Cheng, T.Y. / Chen, Y. / Ciacchi, L. / Fulford, T.S. / Farquhar, R. / Kollmorgen, J. / Mayfield, J.A. / Uldrich, A.P. / Ng, E.Z.Q. / Ogg, G.S. / Godfrey, D.I. / Gherardin, N.A. / Chen, Y.L. / Moody, D.B. / Shahine, A. / Rossjohn, J.
History
DepositionMay 5, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 19, 2025Provider: repository / Type: Initial release
Revision 2.0Dec 17, 2025Group: Advisory / Atomic model ...Advisory / Atomic model / Data collection / Database references / Derived calculations / Polymer sequence / Refinement description / Source and taxonomy / Structure summary
Category: atom_site / atom_site_anisotrop ...atom_site / atom_site_anisotrop / chem_comp / chem_comp_atom / chem_comp_bond / entity / entity_poly / entity_poly_seq / entity_src_gen / pdbx_contact_author / pdbx_entity_nonpoly / pdbx_modification_feature / pdbx_nonpoly_scheme / pdbx_poly_seq_scheme / pdbx_refine_tls / pdbx_refine_tls_group / pdbx_struct_sheet_hbond / pdbx_unobs_or_zero_occ_atoms / pdbx_unobs_or_zero_occ_residues / refine / refine_hist / refine_ls_restr / refine_ls_shell / struct_asym / struct_conf / struct_conn / struct_mon_prot_cis / struct_ref_seq / struct_sheet_range
Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.label_seq_id / _atom_site.occupancy / _atom_site.pdbx_formal_charge / _atom_site.type_symbol / _atom_site_anisotrop.U[1][1] / _atom_site_anisotrop.U[1][2] / _atom_site_anisotrop.U[1][3] / _atom_site_anisotrop.U[2][2] / _atom_site_anisotrop.U[2][3] / _atom_site_anisotrop.U[3][3] / _atom_site_anisotrop.id / _atom_site_anisotrop.pdbx_auth_asym_id / _atom_site_anisotrop.pdbx_auth_atom_id / _atom_site_anisotrop.pdbx_auth_comp_id / _atom_site_anisotrop.pdbx_auth_seq_id / _atom_site_anisotrop.pdbx_label_asym_id / _atom_site_anisotrop.pdbx_label_atom_id / _atom_site_anisotrop.pdbx_label_comp_id / _atom_site_anisotrop.pdbx_label_seq_id / _atom_site_anisotrop.type_symbol / _chem_comp.name / _chem_comp_atom.pdbx_stereo_config / _chem_comp_bond.atom_id_1 / _chem_comp_bond.atom_id_2 / _chem_comp_bond.value_order / _entity.formula_weight / _entity.pdbx_description / _entity.pdbx_number_of_molecules / _entity_poly.pdbx_seq_one_letter_code / _entity_poly.pdbx_seq_one_letter_code_can / _entity_src_gen.pdbx_end_seq_num / _pdbx_entity_nonpoly.comp_id / _pdbx_entity_nonpoly.name / _pdbx_modification_feature.label_seq_id / _pdbx_modification_feature.modified_residue_label_seq_id / _pdbx_nonpoly_scheme.auth_mon_id / _pdbx_nonpoly_scheme.auth_seq_num / _pdbx_nonpoly_scheme.entity_id / _pdbx_nonpoly_scheme.mon_id / _pdbx_nonpoly_scheme.pdb_mon_id / _pdbx_struct_sheet_hbond.range_1_label_seq_id / _pdbx_struct_sheet_hbond.range_2_label_seq_id / _pdbx_unobs_or_zero_occ_atoms.label_seq_id / _refine.ls_R_factor_R_free / _refine.ls_R_factor_R_work / _refine.ls_R_factor_obs / _refine.ls_number_reflns_R_free / _refine.ls_number_reflns_obs / _refine.ls_percent_reflns_R_free / _refine.ls_percent_reflns_obs / _refine.overall_SU_ML / _refine.pdbx_ls_sigma_F / _refine.pdbx_overall_phase_error / _refine.pdbx_solvent_shrinkage_radii / _refine.pdbx_solvent_vdw_probe_radii / _refine.pdbx_stereochemistry_target_values / _refine.solvent_model_details / _refine_hist.pdbx_number_atoms_ligand / _refine_hist.pdbx_number_atoms_protein / _struct_asym.entity_id / _struct_conf.beg_label_seq_id / _struct_conf.end_label_seq_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_label_seq_id / _struct_mon_prot_cis.label_seq_id / _struct_mon_prot_cis.pdbx_label_seq_id_2 / _struct_ref_seq.db_align_beg / _struct_ref_seq.pdbx_auth_seq_align_beg / _struct_ref_seq.seq_align_end / _struct_sheet_range.beg_label_seq_id / _struct_sheet_range.end_label_seq_id
Description: Chirality error
Details: In ligand GM3, the chiral centers at sphingoid base were corrected to 2S,3R. The chiral center at C50 was also corrected.
Provider: author / Type: Coordinate replacement
Revision 2.1Jan 14, 2026Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: T-cell surface glycoprotein CD1c/T-cell surface glycoprotein CD1b chimeric protein
B: Beta-2-microglobulin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)45,70810
Polymers43,4752
Non-polymers2,2348
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration, Eluted as monomeric heterodimer by size exclusion chromatography
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area4650 Å2
ΔGint-33 kcal/mol
Surface area18850 Å2
MethodPISA
Unit cell
Length a, b, c (Å)88.804, 88.804, 157.198
Angle α, β, γ (deg.)90.00, 90.00, 120.00
Int Tables number152
Space group name H-MP3121

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Components

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Protein , 2 types, 2 molecules AB

#1: Protein T-cell surface glycoprotein CD1c/T-cell surface glycoprotein CD1b chimeric protein


Mass: 31584.357 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CD1C / Production host: Homo sapiens (human)
#2: Protein Beta-2-microglobulin


Mass: 11890.316 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: B2M, CDABP0092, HDCMA22P / Production host: Homo sapiens (human) / References: UniProt: P61769

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Sugars , 1 types, 1 molecules

#3: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 5 types, 7 molecules

#4: Chemical ChemComp-A1CB5 / (2S)-2,3-dihydroxypropyl heptadecanoate


Mass: 344.529 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C20H40O4
#5: Chemical ChemComp-KZF / 2-(cyclohexylazaniumyl)ethanesulfonate


Mass: 207.290 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C8H17NO3S / Comment: pH buffer*YM
#6: Chemical ChemComp-MLA / MALONIC ACID / DICARBOXYLIC ACID C3 / PROPANEDIOLIC ACID / METHANEDICARBOXYLIC ACID


Mass: 104.061 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C3H4O4
#7: Chemical ChemComp-CL / CHLORIDE ION


Mass: 35.453 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Cl
#8: Chemical ChemComp-A1CB6 / (2S,3R,4E)-3-hydroxy-2-octadecanamidooctadec-4-en-1-yl 5-acetamido-3,5-dideoxy-D-glycero-alpha-D-galacto-non-2-ulopyranonosyl-(2->3)-beta-D-galactopyranosyl-(1->4)-beta-D-glucopyranoside / GM3 ganglioside


Mass: 1181.490 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C59H108N2O21 / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 4.12 Å3/Da / Density % sol: 70.15 % / Description: Diamond
Crystal growTemperature: 293 K / Method: vapor diffusion, hanging drop / pH: 9.46
Details: 0.1 M CHES pH 9.46 1.05 M tri-Na Citrate 0.025 M tri-glycine

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Data collection

DiffractionMean temperature: 100 K / Serial crystal experiment: N
Diffraction sourceSource: SYNCHROTRON / Site: Australian Synchrotron / Beamline: MX2 / Wavelength: 0.95373 Å
DetectorType: ADSC QUANTUM 315r / Detector: CCD / Date: Oct 25, 2022
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 0.95373 Å / Relative weight: 1
ReflectionResolution: 2.9→44.4 Å / Num. obs: 16511 / % possible obs: 100 % / Redundancy: 10.1 % / CC1/2: 0.993 / Rmerge(I) obs: 0.125 / Rpim(I) all: 0.042 / Rrim(I) all: 0.132 / Χ2: 0.96 / Net I/σ(I): 13.8 / Num. measured all: 165992
Reflection shellResolution: 2.9→3.08 Å / Redundancy: 10.3 % / Rmerge(I) obs: 1.741 / Num. unique obs: 2621 / CC1/2: 0.653 / Rpim(I) all: 0.567 / Χ2: 0.95

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Processing

Software
NameVersionClassification
PHENIX(1.21rc1_5107: ???)refinement
Aimlessdata scaling
XDSdata reduction
PDB_EXTRACTdata extraction
PHASERphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT / Resolution: 2.9→44.4 Å / Cross valid method: FREE R-VALUE
RfactorNum. reflection% reflection
Rfree0.2717 --
Rwork0.234 --
obs-16473 99.9 %
Refinement stepCycle: LAST / Resolution: 2.9→44.4 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms3130 0 0 0 3130

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