Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 106.30 kDa 
• Atom Count: 7277 
• Modelled Residue Count: 946 
• Deposited Residue Count: 968 
• Unique protein chains: 1

1QOO

lectin UEA-II complexed with NAG

• DOI: 10.2210/pdb1QOO/pdb

• Classification: LECTIN
• Organism(s): Ulex europaeus
• Mutation(s): No 


• Deposited: 1999-11-15 Released: 1999-11-23 
• Deposition Author(s): Loris, R., De Greve, H., Dao-Thi, M.-H., Messens, J., Imberty, A., Wyns, L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.75 Å
• R-Value Free: 0.208 
• R-Value Work: 0.174 
• R-Value Observed: 0.174 

Literature

Structural Basis of Carbohydrate Recognition by Lectin II from Ulex Europaeus, a Protein with a Promiscuous Carbohydrate Binding Site

Loris, R., De Greve, H., Dao-Thi, M.-H., Messens, J., Imberty, A., Wyns, L.

(2000) J Mol Biol 301: 987

• PubMed: 10966800 
• DOI: 10.1006/jmbi.2000.4016
• Primary Citation of Related Structures:  
  1QNW, 1QOT, 1QOS, 1QOO, 1DZQ


• PubMed Abstract: 
  

Protein-carbohydrate interactions are the language of choice for inter- cellular communication. The legume lectins form a large family of homologous proteins that exhibit a wide variety of carbohydrate specificities. The legume lectin family is therefore highly suitable as a model system to study the structural principles of protein-carbohydrate recognition. Until now, structural data are only available for two specificity families: Man/Glc and Gal/GalNAc. No structural data are available for any of the fucose or chitobiose specific lectins. The crystal structure of Ulex europaeus (UEA-II) is the first of a legume lectin belonging to the chitobiose specificity group. The complexes with N-acetylglucosamine, galactose and fucosylgalactose show a promiscuous primary binding site capable of accommodating both N-acetylglucos amine or galactose in the primary binding site. The hydrogen bonding network in these complexes can be considered suboptimal, in agreement with the low affinities of these sugars. In the complexes with chitobiose, lactose and fucosyllactose this suboptimal hydrogen bonding network is compensated by extensive hydrophobic interactions in a Glc/GlcNAc binding subsite. UEA-II thus forms the first example of a legume lectin with a promiscuous binding site and illustrates the importance of hydrophobic interactions in protein-carbohydrate complexes. Together with other known legume lectin crystal structures, it shows how different specificities can be grafted upon a conserved structural framework.

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Related Citations: 

• Novel Structures of Plant Lectins and Their Complexes with Carbohydrates
  Bouckaert, J., Hamelryck, T.W., Wyns, L., Loris, R., Hamelryck, T.W.
  (1999) Curr Opin Struct Biol 9: 572

• The Quaternary Structure of Uea-II, the Chitobiose Specific Lectin from Gorse
  Dao-Thi, M.-H., Rizkallah, P., Wyns, L., Poortmans, F., Loris, R.
  (1998) Acta Crystallogr D Biol Crystallogr 54: 844

• Legume Lectin Structure
  Loris, R., Hamelryck, T.W., Bouckaert, J., Wyns, L.
  (1998) Biochim Biophys Acta 1383: 9

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Organizational Affiliation: 

Laboratorium voor Ultrastruktuur, Vlaams Interuniversitair Instituut voor Biotechnologie, Vrije Universiteit Brussel, Paardenstraat 65, Sint-Genesius-Rode, B-1640, Belgium. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CHITIN BINDING LECTIN, UEA-II	A, B, C, D	242	Ulex europaeus	Mutation(s): 0
Find proteins for Q9FVF8 (Ulex europaeus) Explore Q9FVF8  Go to UniProtKB:  Q9FVF8

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	A, B, C, D	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
MN	A, B, C, D	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N
CA	A, B, C, D	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.75 Å
• R-Value Free: 0.208 
• R-Value Work: 0.174 
• R-Value Observed: 0.174 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 104.48	α = 90
b = 104.48	β = 90
c = 175.35	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-11-15 
• Released Date: 1999-11-23 
Deposition Author(s): Loris, R., De Greve, H., Dao-Thi, M.-H., Messens, J., Imberty, A., Wyns, L.

Revision History  

• Version 1.0: 1999-11-23
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2019-07-24
  Changes: Data collection, Derived calculations
• Version 1.4: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Other, Structure summary