Cited by 589Redox biology and oxidative stressMitochondrial Function and PathologyNitric Oxide and Endothelin Effects

Aconitase is readily inactivated by peroxynitrite, but not by its precursor, nitric oxide.

Open access
Castro, L, Rodriguez, M, Radi, R·1994·Journal of Biological Chemistry

Abstract

Mitochondrial and cytosolic aconitases have been indicated as major targets of .NO- and O2-.-mediated toxicity in cells due to the oxidant-mediated disruption of the [4Fe-4S] prosthetic group. However, under circumstances in which both .NO and O2-. are generated, their almost diffusion-controlled combination reaction (k = 6.7 x 10(9) M-1 s-1), leading to the formation of peroxynitrite anion (ONOO-), can out-compete the direct reactions of .NO and O2-. with aconitase and even the enzymatic dismutation of O2-. by superoxide dismutase. In this work, we report that ONOO- reacts with isolated pig heart mitochondrial aconitase at 1.4 x 10(5) M-1 s-1, resulting in a significant loss of enzymatic activity. Aconitase activity was totally recovered after postincubation with thiols and ferrous iron, indicating that ONOO- reactions with the enzyme involve the perturbation of the labile Fe alpha to yield the inactive [3Fe-4S] cluster, which is also evident by spectral changes. On the other hand, anaerobic exposure of isolated aconitase to high concentrations of .NO (> 100 microM) led to a moderate inhibition of the enzyme, which could be fully overcome by .NO displacement under an argon-saturated atmosphere, in agreement with the formation of a reversible inhibitory complex between .NO and the active site of aconitase. Superoxide inactivated mitochondrial aconitase at (3.5 +/- 2) x 10(6) M-1 s-1, a reaction rate 3 orders of magnitude slower than its reaction rate with .NO. O2-. could represent the main mechanism of inactivation of the enzyme in systems in which it is formed without significant concomitant production of .NO. Our results imply that the mechanisms by which .NO and O2-. inactivate aconitase in cell systems may not be simple due to their direct reactions with the iron-sulfur cluster, but may rely on the formation of ONOO-.

Integrity signals

Registry

Crossref · 10.1016/s0021-9258(18)43894-x

Cites

61 of 61 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Peroxynitrite reacts rapidly with Fe/S clusters leading to the inactivation of critical enzymes such as mitochondrial aconitase.

    “Additionally, peroxynitrite reacts rapidly with Fe/S clusters leading to the inactivation of critical enzymes such as mitochondrial aconitase (155, 401).”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Castro, L., Rodriguez, M., & Radi, R.
Affiliations
Universidad de la República de Uruguay (UY)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1994-11
Volume
269
Issue
47
Pages
29409-29415
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1505685265
Cited by
589
References
61
Citations by year
2026: 2 · 2025: 4 · 2024: 9 · 2023: 5 · 2022: 4 · 2021: 7 · 2020: 5 · 2019: 11 · 2018: 7 · 2017: 9 · 2016: 6 · 2015: 10 · 2014: 15 · 2013: 14 · 2012: 18
FWCI
15.05
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 › Redox biology and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
Keywords
aconitase, peroxynitrite, nitric oxide, superoxide, iron-sulfur clusters, [4Fe-4S] cluster, enzyme inactivation, mitochondrial aconitase, ferrous iron, oxidative stress
MeSH terms
Aconitate Hydratase, Animals, Iron-Sulfur Proteins, Kinetics, Mitochondria, Heart, Nitrates, Nitric Oxide, Nitroso Compounds, Sulfhydryl Compounds, Swine

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review