The screening and characterization of 6-aminopurine-based xanthine oxidase inhibitors.
Xanthine oxidase (XO) is a key enzyme which can catalyze xanthine to uric acid causing hyperuricemia in humans. By using the fractionation technique and inhibitory activity assay, an active compound that prevents XO from reacting with xanthine was isolated from wheat leaf. It was identified by the Mass and NMR as 6-aminopurine (adenine). A structure-activity study based on 6-aminopurine was conducted. The inhibition of XO activity by 6-aminopurine (IC(50)=10.89+/-0.13 microM) and its analogues was compared with that by allopurinol (IC(50)=7.82+/-0.12 microM). Among these analogues, 2-chloro-6(methylamino)purine (IC(50)=10.19+/-0.10 microM) and 4-aminopyrazolo[3,4-d] pyrimidine (IC(50)=30.26+/-0.23 microM) were found to be potent inhibitors of XO. Kinetics study showed that 2-chloro-6(methylamino)purine is non-competitive, while 4-aminopyrazolo[3,4-d]pyrimidine is competitive against XO.
Hsieh
Jung-Feng
JF
Institute of Biological Chemistry and the Genomics Research Center, Academia Sinica, Nankang, Taipei 115, Taiwan.
Wu
Shih-Hsiung
SH
Yang
Yu-Liang
YL
Choong
Kee-Fong
KF
Chen
Shui-Tein
ST
D000493:Allopurinol / Q000138:chemical synthesis / Q000494:pharmacology; D002851:Chromatography, High Pressure Liquid; D004353:Drug Evaluation, Preclinical; D004791:Enzyme Inhibitors / Q000138:chemical synthesis* / Q000302:isolation & purification / Q000494:pharmacology*; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D018515:Plant Leaves / Q000737:chemistry; D011687:Purines / Q000138:chemical synthesis* / Q000302:isolation & purification / Q000494:pharmacology*; D013056:Spectrophotometry, Ultraviolet; D013329:Structure-Activity Relationship; D014908:Triticum / Q000737:chemistry; D014969:Xanthine Oxidase / Q000037:antagonists & inhibitors*
D004791:Enzyme Inhibitors; D011687:Purines; D000493:Allopurinol; D014969:Xanthine Oxidase