Experimental Data Snapshot

  • Resolution: 2.52 Å
  • R-Value Work: 0.205 

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X-ray crystallographic studies of unique cross-linked lattices between four isomeric biantennary oligosaccharides and soybean agglutinin.

Olsen, L.R.Dessen, A.Gupta, D.Sabesan, S.Sacchettini, J.C.Brewer, C.F.

(1997) Biochemistry 36: 15073-15080

  • DOI: 10.1021/bi971828+
  • Primary Citation of Related Structures:  
    1SBF, 1SBE, 1SBD

  • PubMed Abstract: 
  • Soybean agglutinin (SBA) (Glycine max) is a tetrameric GalNAc/Gal-specific lectin which forms unique cross-linked complexes with a series of naturally occurring and synthetic multiantennary carbohydrates with terminal GalNAc or Gal residues [Gupta et al. (1994) Biochemistry 33, 7495-7504] ...

    Soybean agglutinin (SBA) (Glycine max) is a tetrameric GalNAc/Gal-specific lectin which forms unique cross-linked complexes with a series of naturally occurring and synthetic multiantennary carbohydrates with terminal GalNAc or Gal residues [Gupta et al. (1994) Biochemistry 33, 7495-7504]. We recently reported the X-ray crystal structure of SBA cross-linked with a biantennary analog of the blood group I carbohydrate antigen [Dessen et al. (1995) Biochemistry 34, 4933-4942]. In order to determine the molecular basis of different carbohydrate-lectin cross-linked lattices, a comparison has been made of the X-ray crystallographic structures of SBA cross-linked with four isomeric analogs of the biantennary blood group I carbohydrate antigen. The four pentasaccharides possess the common structure of (beta-LacNAc)2Gal-beta-R, where R is -O(CH2)5COOCH3. The beta-LacNAc moieties in the four carbohydrates are linked to the 2,3-, 2,4-, 3,6-, and 2,6-positions of the core Gal residue(s), respectively. The structures of all four complexes have been refined to approximately 2.4-2.8 A. Noncovalent lattice formation in all four complexes is promoted uniquely by the bridging action of the two arms of each bivalent carbohydrate. Association between SBA tetramers involves binding of the terminal Gal residues of the pentasaccharides at identical sites in each monomer, with the sugar(s) cross-linking to a symmetry-related neighbor molecule. While the 2,4-, 3,6-, and 2,6-pentasaccharide complexes possess a common P6422 space group, their unit cell dimensions differ. The 2, 3-pentasaccharide cross-linked complex, on the other hand, possesses the space group I4122. Thus, all four complexes are crystallographically distinct. The four cross-linking carbohydrates are in similar conformations, possessing a pseudo-2-fold axis of symmetry which lies on a crystallographic 2-fold axis of symmetry in each lattice. In the case of the 3,6- and 2,6-pentasaccharides, the symmetry of their cross-linked lattices requires different rotamer orientations about their beta(1,6) glycosidic bonds. The results demonstrate that crystal packing interactions are the molecular basis for the formation of distinct cross-linked lattices between SBA and four isomeric pentasaccharides. The present findings are discussed in terms of lectins forming unique cross-linked complexes with glycoconjugate receptors in biological systems.

    Related Citations: 
    • X-Ray Crystal Structure of the Soybean Agglutinin Cross-Linked with a Biantennary Analog of the Blood Group I Carbohydrate Antigen
      Dessen, A., Gupta, D., Sabesan, S., Brewer, C.F., Sacchettini, J.C.
      (1995) Biochemistry 34: 4933

    Organizational Affiliation

    Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, USA.

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SOYBEAN AGGLUTININ A253Glycine maxMutation(s): 0 
Gene Names: LE1
Find proteins for P05046 (Glycine max)
Explore P05046 
Go to UniProtKB:  P05046
Protein Feature View
  • Reference Sequence


Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2 N/A Oligosaccharides Interaction
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Query on MN

Download Ideal Coordinates CCD File 
 Ligand Interaction
Query on CA

Download Ideal Coordinates CCD File 
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Resolution: 2.52 Å
  • R-Value Work: 0.205 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 144.6α = 90
b = 144.6β = 90
c = 107.2γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
XENGENdata reduction
XENGENdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-04-22
    Type: Initial release
  • Version 1.1: 2008-03-10
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary