Cited by 233Hemoglobin structure and functionNitric Oxide and Endothelin EffectsHeme Oxygenase-1 and Carbon Monoxide

An S -nitrosothiol (SNO) synthase function of hemoglobin that utilizes nitrite as a substrate

Angelo, Michael, Singel, David J., Stamler, Jonathan S.·2006·Proceedings of the National Academy of Sciences

Abstract

Red blood cells (RBCs) act as O(2)-responsive transducers of vasodilator and vasoconstrictor activity in lungs and tissues by regulating the availability of nitric oxide (NO). Vasodilation by RBCs is impaired in diseases characterized by hypoxemia. We have proposed that the extent to which RBCs constrict vs. dilate vessels is, at least partly, controlled by a partitioning between NO bound to heme iron and to Cysbeta93 thiol of hemoglobin (Hb). Hemes sequester NO, whereas thiols deploy NO bioactivity. In recent work, we have suggested that specific micropopulations of NO-liganded Hb could support the chemistry of S-nitrosohemoglobin (SNO-Hb) formation. Here, by using nitrite as the source of NO, we demonstrate that a (T state) micropopulation of a heme-NO species, with spectral and chemical properties of Fe(III)NO, acts as a precursor to SNO-Hb formation, accompanying the allosteric transition of Hb to the R state. We also show that at physiological concentrations of nitrite and deoxyHb, a S-nitrosothiol precursor is formed within seconds and produces SNO-Hb in high yield upon its prompt exposure to O(2) or CO. Deoxygenation/reoxygenation cycling of oxyHb in the presence of physiological amounts of nitrite also efficiently produces SNO-Hb. In contrast, high amounts of nitrite or delays in reoxygenation inhibit the production of SNO-Hb. Collectively, our data provide evidence for a physiological S-nitrosothiol synthase activity of tetrameric Hb that depends on NO-Hb micropopulations and suggest that dysfunction of this activity may contribute to the pathophysiology of cardiopulmonary and blood disorders.

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Crossref · 10.1073/pnas.0600942103

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  • Several proposed mechanisms explain how nitrite-derived bioactivity can be exported from the red blood cell, generally involving either a compartment model with submembrane localization or formation of another nitrogen oxide such as a nitrosothiol or N2O3.

    “Several proposed mechanisms have been constructed to explain how nitrite-derived bioactivity can be exported from the red blood cell and these generally involve either a compartment model with submembrane localization of the reaction allowing for inefficient free NO escape, or the formation of another nitrogen oxide such as a nitrosothiol or N2O3 that can get out of the red blood cell and carry NO”

    From Mechanisms of nitrite bioactivation (2014) · cites this paper as [50]

  • Exogenous administration of nitrite correlates with increased levels of S-nitrosothiols in red blood cells and other tissues both in vivo and in vitro.

    “exogenous administration of nitrite correlates with increased levels of S-nitrosothiols in red blood cells and other tissues both in vivo and in vitro [25, 43, 46-53].”
  • Nitrite supplementation to intact organisms is associated with a widespread increase in the concentration of nitrite and production of NO-derived species such as S-nitrosothiols or nitrosylhemes in several tissues.

    “Many reports show that nitrite supplementation to intact organisms is associated with a widespread increase in the concentration of this anion and production of NO-derived species such as S-nitrosothiols or nitrosylhemes in several tissues[25, 43, 46, 48, 49, 96].”
  • A potential mechanism by which nitrite could induce cGMP-independent effects is S-nitrosation of cysteine residues, a potential nitrite-induced post-translational modification that can alter protein function.

    “A potential mechanism by which nitrite could induce cGMP-independent effects is S-nitrosation of cysteine residues, which is being increasingly recognized as a potential nitrite-induced post-translational modification that can alter protein function[17, 43, 46, 47, 51, 96].”

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  1. [28]Fago, A., Crumbliss, A. L., Peterson, J., Pearce, L. L. & Bonaventura, C. (2003) Proc. Natl. Acad. Sci. USA 100, 12087-12092.

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Authors
Angelo, M., Singel, D. J., & Stamler, J. S.
Affiliations
  • Duke Medical Center (US)
  • Montana State University (US)
  • Duke University (US)
Venue
Proceedings of the National Academy of Sciences
Published
2006-05-30
Volume
103
Issue
22
Pages
8366-8371
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1989100763
Cited by
233
References
38
Citations by year
2026: 2 · 2025: 7 · 2024: 5 · 2023: 6 · 2022: 4 · 2021: 4 · 2020: 6 · 2019: 7 · 2018: 10 · 2017: 10 · 2016: 4 · 2015: 5 · 2014: 9 · 2013: 10 · 2012: 19
FWCI
12.15
Type
journal article
Language
en
Open access
closed
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation
  • National Heart, Lung, and Blood Institute (P01HL042444, R01 HL42444)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heme Oxygenase-1 and Carbon Monoxide
Keywords
hemoglobin, S-nitrosohemoglobin, nitrite, nitric oxide, T state, allosteric transition, R state, erythrocytes, vasodilation, hypoxemia
MeSH terms
Hemoglobins, Humans, Iron, Nitrites, Oxygen, Spectrum Analysis, Substrate Specificity, S-Nitrosothiols

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