Cited by 77Nitric Oxide and Endothelin EffectsMetal-Catalyzed Oxygenation MechanismsMetalloenzymes and iron-sulfur proteins

Tetrahydrobiopterin in nitric oxide synthase

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Tejero, Jesús, Stuehr, Dennis·2013·IUBMB Life

Abstract

Summary: Nitric oxide synthase (NOS) is a critical enzyme for the production of the messenger molecule nitric oxide (NO) from L‐arginine. NOS enzymes require tetrahydrobiopterin as a cofactor for NO synthesis. Besides being one of the few enzymes to use this cofactor, the role of tetrahydrobiopterin in NOS catalytic mechanism is different from other enzymes: during the catalytic cycle of NOS, tetrahydrobiopterin forms a radical species that is again reduced, thus effectively regenerating after each NO synthesis cycle. In this review, we summarize our current knowledge about the role of tetrahydrobiopterin in the structure, function, and catalytic mechanism of NOS enzymes. © 2013 IUBMB Life 65(4):358–365, 2013.

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  • Competing reactions, namely NO scavenging by ferrous heme and NO dioxygenation, greatly decrease the amount of bioavailable NO generated by reactions of nitrite with heme proteins.

    “It should be noted that competing reactions, namely the scavenging of NO by the ferrous heme [rate constants in the order of 1.7 × 107 to 1.5 × 108 M−1s−1 (180, 967), Eq. 6] and the rate of NO dioxygenation [rate constants in the order of 3.4 × 107 to 8.9 × 107 M−1s−1 for mammalian Hb/Mb (264, 341), Eq. 8] greatly decrease the amount of bioavailable NO generated by the reactions of nitrite with he”

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Authors
Tejero, J., & Stuehr, D.
Affiliations
  • University of Pittsburgh (US)
  • Cleveland Clinic (US)
Corresponding author
Stuehr, Dennis
Venue
IUBMB Life
Publisher
Wiley
Published
2013-02-26
Volume
65
Issue
4
Pages
358-365
ISSN
  • 1521-6543 (ISSN-L)
  • 1521-6551
OpenAlex
W2021740616
Cited by
75
References
54
Citations by year
2026: 2 · 2025: 2 · 2024: 3 · 2023: 1 · 2022: 7 · 2021: 2 · 2020: 5 · 2019: 5 · 2018: 13 · 2017: 6 · 2016: 11 · 2015: 7 · 2014: 6 · 2013: 5
FWCI
1.14
Type
journal article
Language
en
Open access
Locations
  • IUBMB Life (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Metalloenzymes and iron-sulfur proteins
Keywords
tetrahydrobiopterin, nitric oxide synthase, nitric oxide, L-arginine, cofactors, catalytic mechanism, radical formation, enzyme structure, enzyme function
MeSH terms
Amino Acid Oxidoreductases, Arginine, Biopterins, Catalysis, Heme, Nitric Oxide, Nitric Oxide Synthase

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