6QGE

Galectin-3C in complex with a pair of enantiomeric ligands: S enantiomer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.16 Å
  • R-Value Free: 0.156 
  • R-Value Work: 0.126 
  • R-Value Observed: 0.127 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Interplay between Conformational Entropy and Solvation Entropy in Protein-Ligand Binding.

Verteramo, M.L.Stenstrom, O.Ignjatovic, M.M.Caldararu, O.Olsson, M.A.Manzoni, F.Leffler, H.Oksanen, E.Logan, D.T.Nilsson, U.J.Ryde, U.Akke, M.

(2019) J Am Chem Soc 141: 2012-2026

  • DOI: https://doi.org/10.1021/jacs.8b11099
  • Primary Citation of Related Structures:  
    6QGE, 6QGF

  • PubMed Abstract: 

    Understanding the driving forces underlying molecular recognition is of fundamental importance in chemistry and biology. The challenge is to unravel the binding thermodynamics into separate contributions and to interpret these in molecular terms. Entropic contributions to the free energy of binding are particularly difficult to assess in this regard. Here we pinpoint the molecular determinants underlying differences in ligand affinity to the carbohydrate recognition domain of galectin-3, using a combination of isothermal titration calorimetry, X-ray crystallography, NMR relaxation, and molecular dynamics simulations followed by conformational entropy and grid inhomogeneous solvation theory (GIST) analyses. Using a pair of diastereomeric ligands that have essentially identical chemical potential in the unbound state, we reduced the problem of dissecting the thermodynamics to a comparison of the two protein-ligand complexes. While the free energies of binding are nearly equal for the R and S diastereomers, greater differences are observed for the enthalpy and entropy, which consequently exhibit compensatory behavior, ΔΔ H°(R - S) = -5 ± 1 kJ/mol and - TΔΔ S°(R - S) = 3 ± 1 kJ/mol. NMR relaxation experiments and molecular dynamics simulations indicate that the protein in complex with the S-stereoisomer has greater conformational entropy than in the R-complex. GIST calculations reveal additional, but smaller, contributions from solvation entropy, again in favor of the S-complex. Thus, conformational entropy apparently dominates over solvation entropy in dictating the difference in the overall entropy of binding. This case highlights an interplay between conformational entropy and solvation entropy, pointing to both opportunities and challenges in drug design.


  • Organizational Affiliation

    Centre for Analysis and Synthesis, Department of Chemistry , Lund University , 221 00 Lund , Sweden.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Galectin-3138Homo sapiensMutation(s): 0 
Gene Names: LGALS3MAC2
UniProt & NIH Common Fund Data Resources
Find proteins for P17931 (Homo sapiens)
Explore P17931 
Go to UniProtKB:  P17931
PHAROS:  P17931
GTEx:  ENSG00000131981 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP17931
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
J1E (Subject of Investigation/LOI)
Query on J1E

Download Ideal Coordinates CCD File 
B [auth A](2~{S},3~{R},4~{S},5~{R},6~{R})-4-[4-(3-fluorophenyl)-1,2,3-triazol-1-yl]-2-[(2~{S})-3-[4-(3-fluorophenyl)-1,2,3-triazol-1-yl]-2-oxidanyl-propyl]sulfanyl-6-(hydroxymethyl)oxane-3,5-diol
C25 H26 F2 N6 O5 S
QSKQHLBUOMOHKU-BFBBIWCXSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.16 Å
  • R-Value Free: 0.156 
  • R-Value Work: 0.126 
  • R-Value Observed: 0.127 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.388α = 90
b = 57.814β = 90
c = 62.586γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Knut and Alice Wallenberg FoundationSwedenKAW 2013.022
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Revision History  (Full details and data files)

  • Version 1.0: 2019-01-23
    Type: Initial release
  • Version 1.1: 2019-02-13
    Changes: Data collection, Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Refinement description