Synthesis and evaluation of 3-phenylpyrazolo[3,4-d]pyrimidine-peptide conjugates as Src kinase inhibitors

Anil Kumar, Yuehao Wang, Xiaofeng Lin, Gongqin Sun, Keykavous Parang

Research output: Contribution to journalArticlepeer-review


3-Phenylpyrazolo[3,4-d]pyrimidine (PhPP) derivatives substituted with an alkyl or aryl carboxylic acid at the N1-endocyclic amine, such as PhPP-CH 2COOH (IC50=250 μm), and peptides Ac-CIYKYY (IC 50=400 μm) and Ac-YIYGSFK (IC50=570 μm) were weak inhibitors of polyE4Y phosphorylation by active c-Src. A series of PhPP-peptide conjugates were synthesized using PhPP as an ATP mimic and CIYKYY or YIYGSFK as a peptide substrate to improve the inhibitory potency against active c-Src kinase. PhPP derivatives were attached to the Nterminus or the side chain of amino acids in the peptide template. Two N-terminal substituted conjugates, PhPP-CH2CO-CIYKYY (IC50=0.38 μm) and PhPP-CH2CO-YIYGSFK (IC50=2.7 μm), inhibited the polyE4Y phosphorylation by active c-Src significantly higher than that of the parent compounds. The conjugation of PhPP with the peptides produced a synergistic inhibition effect possibly through creation of favorable interactions between the conjugate and the kinase domain as shown by molecular modeling studies.

Original languageEnglish (US)
Pages (from-to)1346-1360
Number of pages15
Issue number9
StatePublished - Sep 10 2007
Externally publishedYes


  • Peptides
  • Pyrazolopyrimidine
  • Solid-phase synthesis
  • Src kinase
  • Structure-activity relationships

ASJC Scopus subject areas

  • Pharmacology, Toxicology and Pharmaceutics(all)
  • Organic Chemistry
  • Molecular Medicine


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