Crystal structure of human galectin-1 in complex with methyl 2-O-acetyl-3-O-toluoyl-beta-D-talopyranoside

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

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Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


Taloside inhibitors of galectin-1 and galectin-3

Collins, P.M.Oberg, C.T.Leffler, H.Nilsson, U.J.Blanchard, H.

(2012) Chem Biol Drug Des 79: 339-346

  • DOI: https://doi.org/10.1111/j.1747-0285.2011.01283.x
  • Primary Citation of Related Structures:  
    3T1L, 3T1M, 3T2T

  • PubMed Abstract: 

    Galectin-1 and galectin-3 have roles in cancer and inflammation. Galectin-1 has recently emerged as a significant protein produced by tumour cells to promote tumour development, angiogenesis and metastasis and consequently represents an important target to inhibit. The design of inhibitors targeting the carbohydrate recognition domain that is known to recognize galactose is an important approach in the fight against cancer. Based on the analysis of crystal structures, we pursued the concept that if the galactose was replaced with talose (the C2 epimer of galactose) as a scaffold, then O2 substituents would be directed closer to the protein surface and provide opportunity to design inhibitors that are more specific towards particular galectins. Our elucidation of X-ray crystal structures of two of our synthesized talosides in complex with galectin-1 and galectin-3 provides the first atomic information on the interactions of galectins, and indeed any protein, with talosides. These results have enabled a structure-based rationale for the specificity differences shown by galectin-1 and galectin-3 towards these talosides and demonstrate new opportunities for further exploitation as specific inhibitors of galectins.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
135Homo sapiensMutation(s): 0 
Gene Names: LGALS1
UniProt & NIH Common Fund Data Resources
Find proteins for P09382 (Homo sapiens)
Explore P09382 
Go to UniProtKB:  P09382
PHAROS:  P09382
GTEx:  ENSG00000100097 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09382
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MQT

Download Ideal Coordinates CCD File 
C [auth A]methyl 2-O-acetyl-3-O-(4-methylbenzoyl)-beta-D-talopyranoside
C17 H22 O8
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CME
A, B
Binding Affinity Annotations 
IDSourceBinding Affinity
MQT PDBBind:  3T2T Kd: 4.00e+6 (nM) from 1 assay(s)
BindingDB:  3T2T Kd: 4.00e+6 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.687α = 90
b = 58.444β = 90
c = 112.28γ = 90
Software Package:
Software NamePurpose
PROTEUM PLUSdata collection
SAINTdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-28
    Type: Initial release
  • Version 1.1: 2013-07-03
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations