1DBN

MAACKIA AMURENSIS LEUKOAGGLUTININ (LECTIN) WITH SIALYLLACTOSE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.224 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

An unusual carbohydrate binding site revealed by the structures of two Maackia amurensis lectins complexed with sialic acid-containing oligosaccharides.

Imberty, A.Gautier, C.Lescar, J.Perez, S.Wyns, L.Loris, R.

(2000) J Biol Chem 275: 17541-17548

  • DOI: 10.1074/jbc.M000560200
  • Primary Citation of Related Structures:  
    1DBN

  • PubMed Abstract: 
  • Seeds from the legume tree Maackia amurensis contain two lectins that can agglutinate different blood cell types. Their specificity toward sialylated oligosaccharides is unique among legume lectins; the leukoagglutinin preferentially binds to sialyllactosamine (alphaNeuAc(2-3)betaGal(1-4)betaGlcNAc), whereas the hemagglutinin displays higher affinity for a disialylated tetrasaccharide (alphaNeuAc(2-3)betaGal(1-3)[alphaNeuAc(2-6)]alphaG alNAc) ...

    Seeds from the legume tree Maackia amurensis contain two lectins that can agglutinate different blood cell types. Their specificity toward sialylated oligosaccharides is unique among legume lectins; the leukoagglutinin preferentially binds to sialyllactosamine (alphaNeuAc(2-3)betaGal(1-4)betaGlcNAc), whereas the hemagglutinin displays higher affinity for a disialylated tetrasaccharide (alphaNeuAc(2-3)betaGal(1-3)[alphaNeuAc(2-6)]alphaG alNAc). The three-dimensional structure of the complex between M. amurensis leukoagglutinin and sialyllactose has been determined at 2.75-A resolution using x-ray crystallography. The carbohydrate binding site consists of a deep cleft that accommodates the three carbohydrate residues of the sialyllactose. The central galactose sits in the primary binding site in an orientation that has not been observed previously in other legume lectins. The carboxyl group of sialic acid establishes a salt bridge with a lysine side chain. The glucose residue is very efficiently docked between two tyrosine aromatic rings. The complex between M. amurensis hemagglutinin and a disialylated tetrasaccharide could be modeled from the leukoagglutinin/sialyllactose crystal structure. The substitution of one tyrosine by an alanine residue is responsible for the difference in fine specificity between the two isolectins. Comparison with other legume lectins indicates that oligosaccharide specificity within this family is achieved by the recycling of structural loops in different combinations.


    Related Citations: 
    • Sialic Acid-binding Motif of Maackia Amurensis Lectins
      Yamamoto, K., Konami, Y., Irimura, T.
      (1997) J Biochem 121: 756
    • Studies on Hemagglutinins from Maackia Amurensis Seeds
      Kawaguchi, T., Matsumoto, I., Osawa, T.
      (1974) J Biol Chem 249: 2786

    Organizational Affiliation

    Centre de Recherches sur les Macromolécules Végétales, CNRS (affiliated with Université Joseph Fourier), BP 53, F-38041 Grenoble cedex 09, France. anne.imberty@cermav.cnrs.fr



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (LEUKOAGGLUTININ)A, B239Maackia amurensisMutation(s): 0 
Gene Names: MAL
UniProt
Find proteins for P93248 (Maackia amurensis)
Explore P93248 
Go to UniProtKB:  P93248
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
N-acetyl-alpha-neuraminic acid-(2-3)-beta-D-galactopyranose-(1-4)-beta-D-glucopyranoseC, D3 N/A Oligosaccharides Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.224 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.742α = 90
b = 88.45β = 90
c = 84.496γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-06-14
    Type: Initial release
  • Version 1.1: 2008-04-27
    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: Atomic model, Data collection, Derived calculations, Structure summary