Cited by 28Hemoglobin structure and functionMetal-Catalyzed Oxygenation MechanismsPorphyrin and Phthalocyanine Chemistry

Reactivity of glass-embedded met hemoglobin derivatives toward external NO: implications for nitrite-mediated production of bioactive NO

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Navati, Mahantesh S., Friedman, Joel M.·2009·Journal of the American Chemical Society

Abstract

Many protein reactions are exceedingly difficult to dissect under standard conditions due to low concentrations of reactants and intermediates. A case in point are several proposed reactions of hemoglobin with both nitrite and nitric oxide. In the present work, glassy matrices are used to dynamically control the rate at which externally introduced gaseous NO accesses and reacts with several different met Hb derivatives including the nitrite, nitrate, and aquomet forms. This novel yet general approach reveals a clear difference between nitrite and other ligands including nitrate, water, and an internal imidazole. For nitrate, water, and the internal distal imidazole, the observed spectral changes indicate that NO entering the distal heme pocket is effective in displacing these ligands from the ferric heme iron. In contrast, when the ligand is nitrite, the resulting initial spectra indicate the formation of an intermediate that has distinctly ferrous-like properties. The spectrum and the response of DAF fluorescence to the presence of the intermediate are consistent with a recently proposed nitrite anhydrase reaction. This proposed intermediate is especially significant in that it represents a pathway for a nitrite-dependent catalytic process whereby Hb generates relatively long-lived bioactive forms of NO such as S-nitrosoglutathione. The failure to form this intermediate either at low pH or when the glass is extensively dried is consistent with the requirement for a specific conformation of reactants and residue side chains within the distal heme pocket.

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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 [51]

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  1. [1]Kim-Shapiro DB Schechter AN Gladwin MT Arterioscler Thromb Vasc Biol 2006 26 697 705 16424350

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Authors
Navati, M. S., & Friedman, J. M.
Affiliations
Albert Einstein College of Medicine (US)
Corresponding author
Friedman, Joel M.
Venue
Journal of the American Chemical Society
Published
2009-08-10
Volume
131
Issue
34
Pages
12273-12279
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2013015333
Cited by
28
References
32
Citations by year
2024: 1 · 2018: 2 · 2017: 1 · 2016: 2 · 2015: 3 · 2014: 3 · 2013: 5 · 2012: 2
FWCI
1.48
Type
journal article
Language
en
Open access
Locations
  • Journal of the American Chemical Society (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (5p01hl071064-05)
  • National Heart, Lung, and Blood Institute (P01HL-071064)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
  • Physical Sciences › Materials Science › Materials Chemistry › Porphyrin and Phthalocyanine Chemistry
Keywords
methemoglobin, nitric oxide, nitrite, nitrate, distal heme pocket, glass matrix, S-nitrosoglutathione, heme conformation
MeSH terms
Desiccation, Gases, Glass, Hydrogen-Ion Concentration, Methemoglobin, Metmyoglobin, Nitrates, Nitric Oxide, Nitrites, Oxidation-Reduction, Spectrometry, Fluorescence, Fluorescein

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