Phenyl substituted 3-hydroxypyridin-2(1H)-ones: Inhibitors of influenza A endonuclease

Ajit K. Parhi, Amy Xiang, Joseph D. Bauman, Disha Patel, R. S.K. Vijayan, Kalyan Das, Eddy Arnold, Edmond J. Lavoie

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Inhibition of the endonuclease activity of influenza RNA-dependent RNA polymerase is recognized as an attractive target for the development of new agents for the treatment of influenza infection. Our earlier study employing small molecule fragment screening using a high-resolution crystal form of pandemic 2009 H1N1 influenza A endonuclease domain (PAN) resulted in the identification of 5-chloro-3-hydroxypyridin-2(1H)-one as a bimetal chelating ligand at the active site of the enzyme. In the present study, several phenyl substituted 3-hydroxypyridin-2(1H)-one compounds were synthesized and evaluated for their ability to inhibit the endonuclease activity as measured by a high-throughput fluorescence assay. Two of the more potent compounds in this series, 16 and 18, had IC50 values of 11 and 23 nM in the enzymatic assay, respectively. Crystal structures revealed that these compounds had distinct binding modes that chelate the two active site metal ions (M1 and M2) using only two chelating groups. The SAR and the binding mode of these 3-hydroxypyridin-2-ones provide a basis for developing a new class of anti-influenza drugs.

Original languageEnglish (US)
Pages (from-to)6435-6446
Number of pages12
JournalBioorganic and Medicinal Chemistry
Issue number21
StatePublished - Nov 1 2013

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry


  • Antiviral
  • Endonuclease
  • Influenza A Pyridinones 3-Hydroxypyridin-2-ones


Dive into the research topics of 'Phenyl substituted 3-hydroxypyridin-2(1H)-ones: Inhibitors of influenza A endonuclease'. Together they form a unique fingerprint.

Cite this