5H9Q

Crystal Structure of Human Galectin-7 in Complex with TD139

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.931 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Dual thio-digalactoside-binding modes of human galectins as the structural basis for the design of potent and selective inhibitors

Hsieh, T.J., Lin, H.Y., Tu, Z., Lin, T.C., Wu, S.C., Tseng, Y.Y., Liu, F.T., Danny Hsu, S.T., Lin, C.H.

(2016) Sci Rep 6: 29457-29457

  • DOI: 10.1038/srep29457
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Human galectins are promising targets for cancer immunotherapeutic and fibrotic disease-related drugs. We report herein the binding interactions of three thio-digalactosides (TDGs) including TDG itself, TD139 (3,3'-deoxy-3,3'-bis-(4-[m-fluorophenyl]- ...

    Human galectins are promising targets for cancer immunotherapeutic and fibrotic disease-related drugs. We report herein the binding interactions of three thio-digalactosides (TDGs) including TDG itself, TD139 (3,3'-deoxy-3,3'-bis-(4-[m-fluorophenyl]-1H-1,2,3-triazol-1-yl)-thio-digalactoside, recently approved for the treatment of idiopathic pulmonary fibrosis), and TAZTDG (3-deoxy-3-(4-[m-fluorophenyl]-1H-1,2,3-triazol-1-yl)-thio-digalactoside) with human galectins-1, -3 and -7 as assessed by X-ray crystallography, isothermal titration calorimetry and NMR spectroscopy. Five binding subsites (A-E) make up the carbohydrate-recognition domains of these galectins. We identified novel interactions between an arginine within subsite E of the galectins and an arene group in the ligands. In addition to the interactions contributed by the galactosyl sugar residues bound at subsites C and D, the fluorophenyl group of TAZTDG preferentially bound to subsite B in galectin-3, whereas the same group favored binding at subsite E in galectins-1 and -7. The characterised dual binding modes demonstrate how binding potency, reported as decreased Kd values of the TDG inhibitors from μM to nM, is improved and also offer insights to development of selective inhibitors for individual galectins.

    Organizational Affiliation: 

    Institute of Biological Chemistry, Academia Sinica, Taipei, 11529, Taiwan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Galectin-7
A, B
155Homo sapiensMutation(s): 0 
Gene Names: LGALS7, LGALS7B (PIG1)
Find proteins for P47929 (Homo sapiens)
Go to Gene View: LGALS7 LGALS7B
Go to UniProtKB:  P47929
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TD2
Query on TD2
Download SDF File 
Download CCD File 
B
3-deoxy-3-[4-(3-fluorophenyl)-1H-1,2,3-triazol-1-yl]-beta-D-galactopyranosyl 3-deoxy-3-[4-(3-fluorophenyl)-1H-1,2,3-triazol-1-yl]-1-thio-beta-D-galactopyranoside
C28 H30 F2 N6 O8 S
YGIDGBAHDZEYMT-MQFIMZJJSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.931 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 53.896α = 90.00
b = 64.426β = 90.00
c = 70.616γ = 90.00
Software Package:
Software NamePurpose
PHENIXphasing
PHENIXrefinement
HKL-2000data scaling
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Academia SinicaTaiwan--
Ministry of Science and TechnologyTaiwan102-2113-M-001-001-MY3
Ministry of Science and TechnologyTaiwan102-2923-M-001-001-MY3

Revision History 

  • Version 1.0: 2016-06-29
    Type: Initial release
  • Version 1.1: 2016-07-27
    Type: Database references