An Extremely Potent Inhibitor of Xanthine Oxidoreductase
Open accessAbstract
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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Some interplay between COX-2 and other ROS/RNS-generating proteins such as iNOS and XO has been described.
“Interestingly, some interplay between COX-2 and other ROS/RNS-generating proteins such as iNOS (52) and XO (701) have been described.”
From Sources of Vascular Nitric Oxide and Reactive Oxygen Species and Their Regulation (2019) · cites this paper as [701]
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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
- hybrid
- doi.org
- Licence
- 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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