Erythrina cristagalli bound to N-linked oligosaccharide and lactose

Experimental Data Snapshot

  • Resolution: 2.13 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 

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This is version 1.3 of the entry. See complete history


Crystal structures of Erythrina cristagalli lectin with bound N-linked oligosaccharide and lactose.

Turton, K.Natesh, R.Thiyagarajan, N.Chaddock, J.A.Acharya, K.R.

(2004) Glycobiology 14: 923-929

  • DOI: https://doi.org/10.1093/glycob/cwh114
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Erythrina cristagalli lectin (ECL) is a galactose-specific legume lectin. Although its biological function in the legume is unknown, ECL exhibits hemagglutinating activity in vitro and is mitogenic for T lymphocytes. In addition, it has been recently shown that ECL forms a novel conjugate when coupled to a catalytically active derivative of the type A neurotoxin from Clostridium botulinum, thus providing a therapeutic potential. ECL is biologically active as a dimer in which each protomer contains a functional carbohydrate-combining site. The crystal structure of native ECL was recently reported in complex with lactose and 2'-fucosyllactose. ECL protomers adopt the legume lectin fold but form non-canonical dimers via the handshake motif as was previously observed for Erythrina corallodendron lectin. Here we report the crystal structures of native and recombinant forms of the lectin in three new crystal forms, both unliganded and in complex with lactose. For the first time, the detailed structure of the glycosylated hexasaccharide for native ECL has been elucidated. The structure also shows that in the crystal lattice the glycosylation site and the carbohydrate binding site are involved in intermolecular contacts through water-mediated interactions.

  • Organizational Affiliation

    Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
242Erythrina crista-galliMutation(s): 0 
Gene Names: ECL
Find proteins for Q6YD91 (Erythrina crista-galli)
Explore Q6YD91 
Go to UniProtKB:  Q6YD91
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6YD91
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 2.13 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.28α = 86.23
b = 55.37β = 75.37
c = 86.93γ = 82.13
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-06-22
    Type: Initial release
  • Version 1.1: 2011-05-07
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-06-20
    Changes: Data collection, Database references, Source and taxonomy, Structure summary