Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 

wwPDB Validation   3D Report Full Report

This is version 2.1 of the entry. See complete history


Structural analysis and unique molecular recognition properties of a Bauhinia forficata lectin that inhibits cancer cell growth.

Lubkowski, J.Durbin, S.V.Silva, M.C.Farnsworth, D.Gildersleeve, J.C.Oliva, M.L.Wlodawer, A.

(2017) FEBS J 284: 429-450

  • DOI: https://doi.org/10.1111/febs.13989
  • Primary Citation of Related Structures:  
    5T50, 5T52, 5T54, 5T55, 5T5J, 5T5L, 5T5O, 5T5P

  • PubMed Abstract: 

    Lectins have been used at length for basic research and clinical applications. New insights into the molecular recognition properties enhance our basic understanding of carbohydrate-protein interactions and aid in the design/development of new lectins. In this study, we used a combination of cell-based assays, glycan microarrays, and X-ray crystallography to evaluate the structure and function of the recombinant Bauhinia forficata lectin (BfL). The lectin was shown to be cytostatic for several cancer cell lines included in the NCI-60 panel; in particular, it inhibited growth of melanoma cancer cells (LOX IMVI) by over 95%. BfL is dimeric in solution and highly specific for binding of oligosaccharides and glycopeptides with terminal N-acetylgalactosamine (GalNAc). BfL was found to have especially strong binding (apparent K d  = 0.5-1.0 nm) to the tumor-associated Tn antigen. High-resolution crystal structures were determined for the ligand-free lectin, as well as for its complexes with three Tn glycopeptides, globotetraose, and the blood group A antigen. Extensive analysis of the eight crystal structures and comparison to structures of related lectins revealed several unique features of GalNAc recognition. Of special note, the carboxylate group of Glu126, lining the glycan-binding pocket, forms H-bonds with both the N-acetyl of GalNAc and the peptide amido group of Tn antigens. Stabilization provided by Glu126 is described here for the first time for any GalNAc-specific lectin. Taken together, the results provide new insights into the molecular recognition of carbohydrates and provide a structural understanding that will enable rational engineering of BfL for a variety of applications. Structural data are available in the PDB under the accession numbers 5T50, 5T52, 5T55, 5T54, 5T5L, 5T5J, 5T5P, and 5T5O.

  • Organizational Affiliation

    Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
242Bauhinia forficataMutation(s): 0 
Find proteins for P86993 (Bauhinia forficata)
Explore P86993 
Go to UniProtKB:  P86993
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP86993
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
C, D
Glycosylation Resources
GlyTouCan:  G15611BA
GlyCosmos:  G15611BA
GlyGen:  G15611BA
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.829α = 90
b = 44.82β = 100.05
c = 65.771γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
HKL-3000data scaling
PDB_EXTRACTdata extraction
HKL-3000data reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-12-28
    Type: Initial release
  • Version 1.1: 2017-02-08
    Changes: Database references
  • Version 1.2: 2017-02-15
    Changes: Database references
  • Version 1.3: 2017-11-01
    Changes: Author supporting evidence
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Refinement description, Structure summary
  • Version 2.1: 2024-03-06
    Changes: Data collection, Database references, Derived calculations, Structure summary