Crystal Structure of Macrophage Migration Inhibitory Factor complexed with (S,R)-3-(4-hydroxyphenyl)-4,5-dihydro-5-isoxazole-acetic acid methyl ester (ISO-1)

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.237 

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The Tautomerase Active Site of Macrophage Migration Inhibitory factor is a Potential Target for Discovery of Novel Anti-inflammatory Agents

Lubetsky, J.B.Dios, A.Han, J.Aljabari, B.Ruzsicska, B.Mitchell, R.Lolis, E.Al-Abed, Y.

(2002) J Biol Chem 277: 24976-24982

  • DOI: https://doi.org/10.1074/jbc.M203220200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Macrophage migration inhibitory factor (MIF) is an immunoregulatory protein that is a potential therapeutic target for a number of inflammatory diseases. Evidence exists that an unexpected catalytic active site of MIF may have a biological function. To gain further insight into the role of the catalytic active site, a series of mutational, structural, and biological activity studies were performed. The insertion of an alanine between Pro-1 and Met-2 (PAM) abolishes a non-physiological catalytic activity, and this mutant is defective in the in vitro glucocorticoid counter-regulatory activity of MIF. The crystal structure of MIF complexed to (S,R)-3-(4-hydroxyphenyl)-4,5-dihydro-5-isoxazole acetic acid methyl ester (ISO-1), an inhibitor of MIF d-dopachrome tautomerase activity, reveals that ISO-1 binds to the same position of the active site as p-hydroxyphenylpyruvic acid, a substrate of MIF. ISO-1 inhibits several MIF biological activities, further establishing a role for the catalytic active site of MIF.

  • Organizational Affiliation

    Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut 06510, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Macrophage migration inhibitory factor
A, B, C
114Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P14174 (Homo sapiens)
Explore P14174 
Go to UniProtKB:  P14174
PHAROS:  P14174
GTEx:  ENSG00000240972 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14174
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
HDI BindingDB:  1LJT Ki: min: 2.10e+4, max: 4.40e+4 (nM) from 2 assay(s)
Kd: 4.70e+4 (nM) from 1 assay(s)
IC50: min: 7000, max: 1.00e+5 (nM) from 10 assay(s)
PDBBind:  1LJT IC50: 7000 (nM) from 1 assay(s)
Binding MOAD:  1LJT IC50: 7000 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.237 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.8α = 90
b = 95.8β = 90
c = 104.12γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORmodel building

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-11-27
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations