2XR6

Crystal structure of the complex of the carbohydrate recognition domain of human DC-SIGN with pseudo trimannoside mimic.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.147 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Unique Dc-Sign Clustering Activity of a Small Glycomimetic: A Lesson for Ligand Design.

Sutkeviciute, I.Thepaut, M.Sattin, S.Berzi, A.Mcgeagh, J.Grudinin, S.Weiser, J.Le Roy, A.Reina, J.J.Rojo, J.Clerici, M.Bernardi, A.Ebel, C.Fieschi, F.

(2014) Acs Chem.Biol. 9: 1377

  • DOI: 10.1021/cb500054h

  • PubMed Abstract: 
  • DC-SIGN is a dendritic cell-specific C-type lectin receptor that recognizes highly glycosylated ligands expressed on the surface of various pathogens. This receptor plays an important role in the early stages of many viral infections, including HIV, ...

    DC-SIGN is a dendritic cell-specific C-type lectin receptor that recognizes highly glycosylated ligands expressed on the surface of various pathogens. This receptor plays an important role in the early stages of many viral infections, including HIV, which makes it an interesting therapeutic target. Glycomimetic compounds are good drug candidates for DC-SIGN inhibition due to their high solubility, resistance to glycosidases, and nontoxicity. We studied the structural properties of the interaction of the tetrameric DC-SIGN extracellular domain (ECD), with two glycomimetic antagonists, a pseudomannobioside (1) and a linear pseudomannotrioside (2). Though the inhibitory potency of 2, as measured by SPR competition experiments, was 1 order of magnitude higher than that of 1, crystal structures of the complexes within the DC-SIGN carbohydrate recognition domain showed the same binding mode for both compounds. Moreover, when conjugated to multivalent scaffolds, the inhibitory potencies of these compounds became uniform. Combining isothermal titration microcalorimetry, analytical ultracentrifugation, and dynamic light scattering techniques to study DC-SIGN ECD interaction with these glycomimetics revealed that 2 is able, without any multivalent presentation, to cluster DC-SIGN tetramers leading to an artificially overestimated inhibitory potency. The use of multivalent scaffolds presenting 1 or 2 in HIV trans-infection inhibition assay confirms the loss of potency of 2 upon conjugation and the equal efficacy of chemically simpler compound 1. This study documents a unique case where, among two active compounds chemically derived, the compound with the lower apparent activity is the optimal lead for further drug development.


    Organizational Affiliation

    Univ. Grenoble Alpes, Institut de Biologie Structurale (IBS) , Grenoble F-38027, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CD209 ANTIGEN
A
170Homo sapiensMutation(s): 2 
Gene Names: CD209 (CLEC4L)
Find proteins for Q9NNX6 (Homo sapiens)
Go to Gene View: CD209
Go to UniProtKB:  Q9NNX6
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AE9
Query on AE9

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A
2-AZIDOETHANOL
C2 H5 N3 O
BSULWPSUVMOMAN-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MAN
Query on MAN

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Download CCD File 
A
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
07B
Query on 07B

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Download CCD File 
A
dimethyl (1S,2S,4S,5S)-4,5-dihydroxycyclohexane-1,2-dicarboxylate
C10 H16 O6
ICVNZKRWDVXSLF-XAMCCFCMSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.147 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 71.330α = 90.00
b = 71.330β = 90.00
c = 52.666γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling
REFMACrefinement
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-10-19
    Type: Initial release
  • Version 1.1: 2014-07-30
    Type: Database references, Non-polymer description
  • Version 1.2: 2014-08-27
    Type: Database references