Cited by 434Biochemical and Molecular ResearchEnzyme Structure and FunctionGout, Hyperuricemia, Uric Acid

An Extremely Potent Inhibitor of Xanthine Oxidoreductase

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Okamoto, Ken, Eger, Bryan T., Nishino, Tomoko, Kondo, Shiro, Pai, Emil F., Nishino, Takeshi·2003·Journal of Biological Chemistry

Abstract

TEI-6720 (2-(3-cyano-4-isobutoxyphenyl)-4-methyl-5-thiazolecarboxylic acid) is an extremely potent inhibitor of xanthine oxidoreductase. Steady state kinetics measurements exhibit mixed type inhibition with K(i) and K(i)' values of 1.2 +/- 0.05 x 10(-10) m and 9 +/- 0.05 x 10(-10) m, respectively. Fluorescence-monitored titration experiments showed that TEI-6720 bound very tightly to both the active and the inactive desulfo-form of the enzyme. The dissociation constant determined for the desulfo-form was 2 +/- 0.03 x 10(-9) m; for the active form, the corresponding number was too low to allow accurate measurements. The crystal structure of the active sulfo-form of milk xanthine dehydrogenase complexed with TEI-6720 and determined at 2.8-A resolution revealed the inhibitor molecule bound in a long, narrow channel leading to the molybdenum-pterin active site of the enzyme. It filled up most of the channel and the immediate environment of the cofactor, very effectively inhibiting the activity of the enzyme through the prevention of substrate binding. Although the inhibitor did not directly coordinate to the molybdenum ion, numerous hydrogen bonds as well as hydrophobic interactions with the protein matrix were observed, most of which are also used in substrate recognition.

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Crossref · 10.1074/jbc.m208307200

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Authors
Okamoto, K., Eger, B. T., Nishino, T., Kondo, S., Pai, E. F., & Nishino, T.
Affiliations
  • Nippon Medical School (JP)
  • University of Toronto (CA)
  • Teijin (Japan) (JP)
  • University Health Network (CA)
Corresponding author
  • Pai, Emil F.
  • Nishino, Takeshi
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2003-01
Volume
278
Issue
3
Pages
1848-1855
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2073496185
Cited by
434
References
45
Citations by year
2026: 11 · 2025: 28 · 2024: 20 · 2023: 24 · 2022: 31 · 2021: 18 · 2020: 18 · 2019: 21 · 2018: 27 · 2017: 23 · 2016: 22 · 2015: 18 · 2014: 30 · 2013: 13 · 2012: 17
FWCI
3.22
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Molecular Research
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
  • Health Sciences › Medicine › Nephrology › Gout, Hyperuricemia, Uric Acid
Keywords
xanthine oxidoreductase, xanthine dehydrogenase, enzyme inhibition, mixed-type inhibition, inhibitor binding, crystal structure, substrate binding, hydrogen bonding, hydrophobic interactions, milk enzymes
MeSH terms
Febuxostat, Animals, Cattle, Enzyme Inhibitors, Kinetics, Milk, Models, Molecular, Spectrometry, Fluorescence, Thiazoles, Xanthine Dehydrogenase, Molecular Structure, Crystallography, X-Ray

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