Crystal structure of human monoamine oxidase B (MAO B) in complex with pioglitazone

Experimental Data Snapshot

  • Resolution: 1.89 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 

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Molecular Insights Into Human Monoamine Oxidase B Inhibition by the Glitazone Anti-Diabetes Drugs

Binda, C.Aldeco, M.Geldenhuys, W.J.Tortorici, M.Mattevi, A.Edmondson, D.E.

(2012) ACS Med Chem Lett 3: 39-42

  • DOI: https://doi.org/10.1021/ml200196p
  • Primary Citation of Related Structures:  
    4A79, 4A7A

  • PubMed Abstract: 

    The widely employed anti-diabetic drug pioglitazone (Actos) is shown to be a specific and reversible inhibitor of human monoamine oxidase B (MAO B). The crystal structure of the enzyme-inhibitor complex shows the R-enantiomer is bound with the thiazolidinedione ring near the flavin. The molecule occupies both substrate and entrance cavities of the active site establishing non-covalent interactions with the surrounding amino acids. These binding properties differentiate pioglitazone from the clinically used MAO inhibitors, which act through covalent inhibition mechanisms and do not exhibit a high degree of MAO A versus B selectivity. Rosiglitazone (Avandia) and troglitazone, other members of the glitazone class, are less selective in that they are weaker inhibitors of both MAO A and MAO B These results suggest that pioglitazone may have utility as a "re-purposed" neuro-protectant drug in retarding the progression of disease in Parkinson's patients. They also provide new insights for the development of reversible isoenzyme-specific MAO inhibitors.

  • Organizational Affiliation

    Department of Genetics and Microbiology, University of Pavia, 27100 Pavia, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
520Homo sapiensMutation(s): 0 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P27338 (Homo sapiens)
Explore P27338 
Go to UniProtKB:  P27338
PHAROS:  P27338
GTEx:  ENSG00000069535 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27338
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
P1B Binding MOAD:  4A79 Ki: 500 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.89 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 
  • Space Group: C 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.92α = 90
b = 223.67β = 90
c = 86.78γ = 90
Software Package:
Software NamePurpose
MOSFLMdata 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: 2012-04-25
    Type: Initial release
  • Version 1.1: 2012-05-30
    Changes: Other
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description