6B8K

Crystal structure of Human galectin-3 CRD in complex with Lactulose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.28 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.165 

wwPDB Validation   3D Report Full Report


This is version 2.2 of the entry. See complete history


Literature

Lactulose as a novel template for anticancer drug development targeting galectins.

Kishor, C.Ross, R.L.Blanchard, H.

(2018) Chem Biol Drug Des 92: 1801-1808

  • DOI: https://doi.org/10.1111/cbdd.13348
  • Primary Citation of Related Structures:  
    6B8K, 6B94

  • PubMed Abstract: 

    Galectins are carbohydrate binding proteins (lectins), which characteristically bind β-galactosides. Galectins play a role in tumour progression through involvement in proliferation, metastasis, angiogenesis, immune evasion and drug resistance. There is need for inhibitors (antagonists) that are specific for distinct galectins and that can interfere with galectin-carbohydrate interactions during cancer progression. Here, we propose that lactulose, a non-digestible galactose-fructose disaccharide, presents a novel inhibitor scaffold for design of inhibitors against galectins. Thermodynamic evaluation displays binding affinity of lactulose against the galectin-1 and galectin-3 carbohydrate recognition domain (CRD). Crystal structures of galectin-1 and galectin-3 in complex with lactulose reveal for the first time the molecular basis of the galectin-lactulose interactions. Molecular modelling was implemented to propose novel lactulose derivatives as potent anti-cancer agents.


  • Organizational Affiliation

    Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Galectin-3139Homo sapiensMutation(s): 0 
Gene Names: LGALS3MAC2
UniProt & NIH Common Fund Data Resources
Find proteins for P17931 (Homo sapiens)
Go to UniProtKB:  P17931
PHAROS:  P17931
GTEx:  ENSG00000131981 
Sequence Annotations
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-galactopyranose-(1-4)-beta-D-fructofuranose
B
2N/A
Glycosylation Resources
GlyTouCan:  G57229GY
GlyCosmos:  G57229GY
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChains NameType/Class2D Diagram3D Interactions
PRD_900038
Query on PRD_900038
B
lactuloseOligosaccharide / Water retention
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.28 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.165 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.17α = 90
b = 57.87β = 90
c = 62.6γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2022-07-20
    Changes: Database references, Structure summary
  • Version 2.2: 2024-05-22
    Changes: Data collection