8JEA

Crystal structure of CGL1 from Crassostrea gigas, mannotriose-bound form (CGL1/Man(alpha)1-2Man(alpha)1-2Man)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.97 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.175 

Starting Model: experimental
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Literature

Mannose oligosaccharide recognition of CGL1, a mannose-specific lectin containing DM9 motifs from Crassostrea gigas, revealed by X-ray crystallographic analysis.

Hatakeyama, T.Masuda, K.Kudo, M.Tanaka, K.Takeuchi, A.Unno, H.

(2023) J Biochem 175: 35-41

  • DOI: https://doi.org/10.1093/jb/mvad073
  • Primary Citation of Related Structures:  
    8JE9, 8JEA, 8JEB

  • PubMed Abstract: 

    CGL1 is a mannose-specific lectin isolated from the Pacific oyster Crassostrea gigas, and it belongs to the DM9 domain protein family. Each subunit of the CGL1 dimer consists of a tandem repeat of DM9 motifs, which were originally found in the Drosophila melanogaster genome. The CGL1 protomer contains two carbohydrate-binding sites: a high-affinity site A and a low-affinity site B. An assay using dendrimers containing oligomannose from yeast (Saccharomyces cerevisiae) revealed that CGL1 exhibited significantly higher affinity for mannotetraose (Man4) compared to mannobiose (Man2) and mannotriose (Man3). To investigate its oligomannose-recognition mechanism, X-ray crystallographic analyses of CGL1/oligomannose complexes were performed. In the CGL1/Man2 and CGL1/Man3 complexes, Manα1-2Man and Manα1-2Manα1-2Man, respectively, were primarily bound to site A, interacting with the non-reducing mannose residue. On the other hand, in the CGL1/Man4 crystal, Man4 (Manα1-2Manα1-2Manα1-6Man) was bound at both site A and site B at the non-reducing and reducing ends, thus linking adjacent CGL1 molecules with crystallographic symmetry. These findings suggest that CGL1 can recognize both the non-reducing and reducing mannose residues of mannose oligosaccharides at its two distinct carbohydrate-binding sites. This enables efficient complex formation, making CGL1 a pattern-recognition molecule capable of recognizing diverse structures of mannose-containing carbohydrate chains.


  • Organizational Affiliation

    Biomolecular Chemistry Laboratory, Graduate School of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Natterin-3
A, B, C, D
142Magallana gigasMutation(s): 0 
UniProt
Find proteins for K1QRB6 (Magallana gigas)
Explore K1QRB6 
Go to UniProtKB:  K1QRB6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupK1QRB6
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-alpha-D-mannopyranoseE [auth X]3N/A
Glycosylation Resources
GlyTouCan:  G28528AG
GlyCosmos:  G28528AG
GlyGen:  G28528AG
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranoseF [auth Y]2N/A
Glycosylation Resources
GlyTouCan:  G53402KW
GlyCosmos:  G53402KW
GlyGen:  G53402KW
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MAN (Subject of Investigation/LOI)
Query on MAN

Download Ideal Coordinates CCD File 
N [auth D]alpha-D-mannopyranose
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
CAC
Query on CAC

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M [auth D]CACODYLATE ION
C2 H6 As O2
OGGXGZAMXPVRFZ-UHFFFAOYSA-M
ACY
Query on ACY

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G [auth A],
H [auth A],
J [auth B],
K [auth B],
L [auth C]
ACETIC ACID
C2 H4 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
I [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
AYA
Query on AYA
A, B, C, D
L-PEPTIDE LINKINGC5 H9 N O3ALA
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.97 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.175 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.734α = 90
b = 58.674β = 93.657
c = 108.41γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other governmentJapan--

Revision History  (Full details and data files)

  • Version 1.0: 2023-10-25
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Database references