Hydrophilic ester-bearing chlorogenic acid binds to a novel domain to inhibit xanthine oxidase

Shwu Huey Wang, Chien Shu Chen, Shih Hao Huang, Szu Hsu Yu, Zhi Yang Lai, Sheng Tung Huang, Chun Mao Lin

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Caffeic acid is a xanthine oxidase (XO) inhibitor that binds to the molybdopterin region of its active site. Caffeic acid phenethyl ester (CAPE) has higher hydrophobicity and exhibits stronger inhibition potency toward XO. Chlorogenic acid is a quinyl ester of caffeic acid that has increased hydrophilicity and also shows stronger XO inhibitory activity compared with caffeic acid. Caffeic acid and CAPE showed competitive inhibition against XO, whereas chlorogenic acid displayed mixed-type inhibition, implying that it binds to sites other than the active site. Structure-based molecular modeling was performed to account for the different binding characteristics of the hydrophobic and hydrophilic esters of caffeic acid. Chlorogenic acid showed weak binding to the molybdopterin region of XO, while it more strongly bound the flavin adenine dinucleotide region than it did the molybdopterin region. These results provide the basis for interactions of caffeic acid analogues with XO via various binding domains.

Original languageEnglish
Pages (from-to)1237-1240
Number of pages4
JournalPlanta Medica
Issue number11
Publication statusPublished - 2009


  • Caffeic acid
  • Chlorogenic acid
  • FAD
  • Molecular modeling
  • Olybdopterin
  • Xanthine oxidase

ASJC Scopus subject areas

  • Drug Discovery
  • Analytical Chemistry
  • Molecular Medicine
  • Complementary and alternative medicine
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry


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