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- PDB-5vkj: Crystal structure of human CD22 Ig domains 1-3 -

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Basic information

Entry
Database: PDB / ID: 5vkj
TitleCrystal structure of human CD22 Ig domains 1-3
ComponentsB-cell receptor CD22
KeywordsIMMUNE SYSTEM / Siglec / Sialic acid / carbohydrate binding protein
Function / homology
Function and homology information


negative regulation of B cell receptor signaling pathway / regulation of B cell proliferation / IgM binding / negative regulation of immunoglobulin production / negative regulation of calcium-mediated signaling / sialic acid binding / CD22 mediated BCR regulation / CD4 receptor binding / neuronal cell body membrane / B cell activation ...negative regulation of B cell receptor signaling pathway / regulation of B cell proliferation / IgM binding / negative regulation of immunoglobulin production / negative regulation of calcium-mediated signaling / sialic acid binding / CD22 mediated BCR regulation / CD4 receptor binding / neuronal cell body membrane / B cell activation / regulation of endocytosis / regulation of immune response / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / recycling endosome / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / carbohydrate binding / protein phosphatase binding / early endosome / cell adhesion / external side of plasma membrane / signaling receptor binding / cell surface / extracellular exosome / membrane / plasma membrane / cytoplasm
Similarity search - Function
CD80-like, immunoglobulin C2-set / CD80-like C2-set immunoglobulin domain / Immunoglobulin domain / Immunoglobulin domain / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Immunoglobulin subtype / Immunoglobulin / Ig-like domain profile. / Immunoglobulin-like domain ...CD80-like, immunoglobulin C2-set / CD80-like C2-set immunoglobulin domain / Immunoglobulin domain / Immunoglobulin domain / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Immunoglobulin subtype / Immunoglobulin / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold
Similarity search - Domain/homology
B-cell receptor CD22
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.12 Å
AuthorsJulien, J.P. / Ereno-Orbea, J. / Sicard, T.
Funding support Canada, 1items
OrganizationGrant numberCountry
CIHR, Banting Canada
CitationJournal: Nat Commun / Year: 2017
Title: Molecular basis of human CD22 function and therapeutic targeting.
Authors: June Ereño-Orbea / Taylor Sicard / Hong Cui / Mohammad T Mazhab-Jafari / Samir Benlekbir / Alba Guarné / John L Rubinstein / Jean-Philippe Julien /
Abstract: CD22 maintains a baseline level of B-cell inhibition to keep humoral immunity in check. As a B-cell-restricted antigen, CD22 is targeted in therapies against dysregulated B cells that cause ...CD22 maintains a baseline level of B-cell inhibition to keep humoral immunity in check. As a B-cell-restricted antigen, CD22 is targeted in therapies against dysregulated B cells that cause autoimmune diseases and blood cancers. Here we report the crystal structure of human CD22 at 2.1 Å resolution, which reveals that specificity for α2-6 sialic acid ligands is dictated by a pre-formed β-hairpin as a unique mode of recognition across sialic acid-binding immunoglobulin-type lectins. The CD22 ectodomain adopts an extended conformation that facilitates concomitant CD22 nanocluster formation on B cells and binding to trans ligands to avert autoimmunity in mammals. We structurally delineate the CD22 site targeted by the therapeutic antibody epratuzumab at 3.1 Å resolution and determine a critical role for CD22 N-linked glycosylation in antibody engagement. Our studies provide molecular insights into mechanisms governing B-cell inhibition and valuable clues for the design of immune modulators in B-cell dysfunction.The B-cell-specific co-receptor CD22 is a therapeutic target for depleting dysregulated B cells. Here the authors structurally characterize the ectodomain of CD22 and present its crystal structure with the bound therapeutic antibody epratuzumab, which gives insights into the mechanism of inhibition of B-cell activation.
History
DepositionApr 21, 2017Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 4, 2017Provider: repository / Type: Initial release
Revision 1.1Oct 25, 2017Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Nov 20, 2019Group: Database references / Category: pdbx_database_related / Item: _pdbx_database_related.db_id
Revision 1.3Nov 27, 2019Group: Database references / Category: pdbx_database_related / Item: _pdbx_database_related.content_type
Revision 2.0Jul 29, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / pdbx_branch_scheme / pdbx_chem_comp_identifier / pdbx_entity_branch / pdbx_entity_branch_descriptor / pdbx_entity_branch_link / pdbx_entity_branch_list / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_struct_assembly_gen / pdbx_struct_special_symmetry / struct_asym / struct_conn / struct_site / struct_site_gen
Item: _atom_site.auth_asym_id / _atom_site.auth_seq_id ..._atom_site.auth_asym_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _atom_site.label_entity_id / _chem_comp.name / _chem_comp.type / _pdbx_struct_assembly_gen.asym_id_list / _pdbx_struct_special_symmetry.label_asym_id / _struct_conn.pdbx_role / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id
Description: Carbohydrate remediation / Provider: repository / Type: Remediation
Revision 2.1Apr 3, 2024Group: Data collection / Database references ...Data collection / Database references / Derived calculations / Refinement description / Structure summary
Category: chem_comp / chem_comp_atom ...chem_comp / chem_comp_atom / chem_comp_bond / database_2 / pdbx_initial_refinement_model / struct_conn
Item: _chem_comp.pdbx_synonyms / _database_2.pdbx_DOI ..._chem_comp.pdbx_synonyms / _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct_conn.pdbx_leaving_atom_flag

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: B-cell receptor CD22
hetero molecules


Theoretical massNumber of molelcules
Total (without water)37,9396
Polymers36,6601
Non-polymers1,2795
Water2,918162
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
Unit cell
Length a, b, c (Å)126.807, 56.569, 49.434
Angle α, β, γ (deg.)90.00, 110.70, 90.00
Int Tables number5
Space group name H-MC121
Components on special symmetry positions
IDModelComponents
11A-514-

HOH

21A-625-

HOH

DetailsMonomer as determined by gel filtration

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Components

#1: Protein B-cell receptor CD22 / B-lymphocyte cell adhesion molecule / BL-CAM / Sialic acid-binding Ig-like lectin 2 / Siglec-2 / T- ...B-lymphocyte cell adhesion molecule / BL-CAM / Sialic acid-binding Ig-like lectin 2 / Siglec-2 / T-cell surface antigen Leu-14


Mass: 36660.293 Da / Num. of mol.: 1 / Fragment: Extracellular domain residues 20-330 / Mutation: N67A,N112A,N135A,N164A,N231A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CD22, SIGLEC2 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P20273
#2: Polysaccharide alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2- ...alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 910.823 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,5,4/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3/a4-b1_b4-c1_c3-d1_c6-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#3: Chemical
ChemComp-GOL / GLYCEROL / GLYCERIN / PROPANE-1,2,3-TRIOL / Glycerol


Mass: 92.094 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C3H8O3
#4: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 162 / Source method: isolated from a natural source / Formula: H2O

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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: 2.26 Å3/Da / Density % sol: 45.63 %
Crystal growTemperature: 293 K / Method: vapor diffusion
Details: 30% PEG 4000, 0.2 M lithium chloride and 0.1 M Tris pH 8.5

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: SYNCHROTRON / Site: CLSI / Beamline: 08ID-1 / Wavelength: 0.97949 Å
DetectorType: RAYONIX MX-300 / Detector: CCD / Date: Sep 13, 2016
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 0.97949 Å / Relative weight: 1
ReflectionResolution: 2.12→46.242 Å / Num. obs: 18725 / % possible obs: 99.8 % / Redundancy: 3.8 % / CC1/2: 0.999 / Rmerge(I) obs: 0.063 / Net I/σ(I): 15.8
Reflection shellResolution: 2.12→2.2 Å / Redundancy: 3.8 % / Rmerge(I) obs: 0.4571 / Mean I/σ(I) obs: 2.3 / Num. unique obs: 1848 / CC1/2: 0.801 / Rpim(I) all: 0.229 / % possible all: 99.8

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Processing

Software
NameVersionClassification
PHENIX(1.12_2829)refinement
XSCALEdata scaling
PDB_EXTRACT3.22data extraction
XDSdata reduction
PHASERphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: Crystal structure from a different crystal obtained with this construct by MAD phasing with heavy atom

Resolution: 2.12→46.242 Å / SU ML: 0.27 / Cross valid method: FREE R-VALUE / σ(F): 1.34 / Phase error: 25.99 / Stereochemistry target values: ML
RfactorNum. reflection% reflection
Rfree0.2321 940 5.02 %
Rwork0.2021 --
obs0.2037 18725 99.85 %
Solvent computationShrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL
Refinement stepCycle: LAST / Resolution: 2.12→46.242 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms2475 0 85 162 2722
Refine LS restraints
Refine-IDTypeDev idealNumber
X-RAY DIFFRACTIONf_bond_d0.0022624
X-RAY DIFFRACTIONf_angle_d0.5373566
X-RAY DIFFRACTIONf_dihedral_angle_d11.6551590
X-RAY DIFFRACTIONf_chiral_restr0.041409
X-RAY DIFFRACTIONf_plane_restr0.003444
LS refinement shell
Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkRefine-ID% reflection obs (%)
2.12-2.23180.3341320.28272527X-RAY DIFFRACTION100
2.2318-2.37160.30091320.26522522X-RAY DIFFRACTION100
2.3716-2.55470.31781340.25292523X-RAY DIFFRACTION100
2.5547-2.81180.26781380.22632524X-RAY DIFFRACTION100
2.8118-3.21850.25171300.21472534X-RAY DIFFRACTION100
3.2185-4.05460.22381320.17742560X-RAY DIFFRACTION100
4.0546-46.25280.17621420.16992595X-RAY DIFFRACTION100

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