Structure of the carbohydrate recognition domain of Dectin-2 complexed with a mammalian-type high mannose Man9GlcNAc2 oligosaccharide

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 

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Mechanism of pathogen recognition by human dectin-2.

Feinberg, H.Jegouzo, S.A.F.Rex, M.J.Drickamer, K.Weis, W.I.Taylor, M.E.

(2017) J Biol Chem 292: 13402-13414

  • DOI: https://doi.org/10.1074/jbc.M117.799080
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Dectin-2, a C-type lectin on macrophages and other cells of the innate immune system, functions in response to pathogens, particularly fungi. The carbohydrate-recognition domain (CRD) in dectin-2 is linked to a transmembrane sequence that interacts with the common Fc receptor γ subunit to initiate immune signaling. The molecular mechanism by which dectin-2 selectively binds to pathogens has been investigated by characterizing the CRD expressed in a bacterial system. Competition binding studies indicated that the CRD binds to monosaccharides with modest affinity and that affinity was greatly enhanced for mannose-linked α1-2 or α1-4 to a second mannose residue. Glycan array analysis confirmed selective binding of the CRD to glycans that contain Manα1-2Man epitopes. Crystals of the CRD in complex with a mammalian-type high-mannose Man 9 GlcNAc 2 oligosaccharide exhibited interaction with Manα1-2Man on two different termini of the glycan, with the reducing-end mannose residue ligated to Ca 2+ in a primary binding site and the nonreducing terminal mannose residue occupying an adjacent secondary site. Comparison of the binding sites in DC-SIGN and langerin, two other pathogen-binding receptors of the innate immune system, revealed why these two binding sites accommodate only terminal Manα1-2Man structures, whereas dectin-2 can bind Manα1-2Man in internal positions in mannans and other polysaccharides. The specificity and geometry of the dectin-2-binding site provide the molecular mechanism for binding of dectin-2 to fungal mannans and also to bacterial lipopolysaccharides, capsular polysaccharides, and lipoarabinomannans that contain the Manα1-2Man disaccharide unit.

  • Organizational Affiliation

    From the Departments of Structural Biology and Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, California 94305 and.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
C-type lectin domain family 6 member A147Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q6EIG7 (Homo sapiens)
Explore Q6EIG7 
Go to UniProtKB:  Q6EIG7
GTEx:  ENSG00000205846 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6EIG7
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G78528AJ
GlyCosmos:  G78528AJ
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.055α = 90
b = 78.834β = 90
c = 76.459γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/K007718/1
Wellcome TrustUnited Kingdom--
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM62116

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-05
    Type: Initial release
  • Version 1.1: 2017-07-12
    Changes: Database references
  • Version 1.2: 2017-08-23
    Changes: Author supporting evidence, Data collection, Database references
  • Version 1.3: 2018-03-21
    Changes: Derived calculations
  • Version 1.4: 2020-01-01
    Changes: Author supporting evidence
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary