Synthesis and evaluation of heterocyclic catechol mimics as inhibitors of catechol-O-methyltransferase (COMT): Structure with Cmpd18 (1-(biphenyl-3-yl)-3-hydroxypyridin-4(1H)-one)

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 

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Synthesis and Evaluation of Heterocyclic Catechol Mimics as Inhibitors of Catechol-O-methyltransferase (COMT).

Harrison, S.T.Poslusney, M.S.Mulhearn, J.J.Zhao, Z.Kett, N.R.Schubert, J.W.Melamed, J.Y.Allison, T.J.Patel, S.B.Sanders, J.M.Sharma, S.Smith, R.F.Hall, D.L.Robinson, R.G.Sachs, N.A.Hutson, P.H.Wolkenberg, S.E.Barrow, J.C.

(2015) ACS Med Chem Lett 6: 318-323

  • DOI: https://doi.org/10.1021/ml500502d
  • Primary Citation of Related Structures:  
    4XUC, 4XUD, 4XUE

  • PubMed Abstract: 

    3-Hydroxy-4-pyridinones and 5-hydroxy-4-pyrimidinones were identified as inhibitors of catechol-O-methyltransferase (COMT) in a high-throughput screen. These heterocyclic catechol mimics exhibit potent inhibition of the enzyme and an improved toxicity profile versus the marketed nitrocatechol inhibitors tolcapone and entacapone. Optimization of the series was aided by X-ray cocrystal structures of the novel inhibitors in complex with COMT and cofactors SAM and Mg(2+). The crystal structures suggest a mechanism of inhibition for these heterocyclic inhibitors distinct from previously disclosed COMT inhibitors.

  • Organizational Affiliation

    Department of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of Neuroscience Research, Merck Research Laboratories , Sumneytown Pike, West Point, Pennsylvania 19486, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Catechol O-methyltransferase218Homo sapiensMutation(s): 1 
Gene Names: COMT
UniProt & NIH Common Fund Data Resources
Find proteins for P21964 (Homo sapiens)
Explore P21964 
Go to UniProtKB:  P21964
PHAROS:  P21964
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21964
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
43G Binding MOAD:  4XUC IC50: 1100 (nM) from 1 assay(s)
BindingDB:  4XUC IC50: min: 47, max: 1100 (nM) from 2 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.741α = 90
b = 57.201β = 90
c = 98.182γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data 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: 2015-04-15
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Derived calculations, Refinement description, Source and taxonomy, Structure summary