Immucillins in custom catalytic-site cavities

Andrew S. Murkin, Keith Clinch, Jennifer M. Mason, Peter C. Tyler, Vern L. Schramm

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Neighboring-group participation in the reaction catalyzed by purine nucleoside phosphorylase involves a compression mode between the 5′- and 4′-ribosyl oxygens, facilitated by His257. The His257Gly mutant opens a space in the catalytic site. Hydrophobic 5′-substituted Immucillins are transition-state analogue inhibitors of this mutant enzyme. Dissociation constants as low as 2 pM are achieved, with Km/Kd as high as 400,000,000.

Original languageEnglish (US)
Pages (from-to)5900-5903
Number of pages4
JournalBioorganic and Medicinal Chemistry Letters
Issue number22
StatePublished - Nov 15 2008


  • Binding
  • ImmH
  • Immucillin
  • Mutant
  • PNP
  • Transition-state analogue

ASJC Scopus subject areas

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


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