Cited by 211Metal-Catalyzed Oxygenation MechanismsGlutathione Transferases and PolymorphismsProtein Structure and Dynamics

Electrostatic interactions in the reaction mechanism of bovine erythrocyte superoxide dismutase

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Cudd, A, Fridovich, I·1982·Journal of Biological Chemistry

Abstract

The activity of the copper- and zinc-containing superoxide dismutase decreased with increasing ionic strength. Modification of lysine residues by acetylation or succinylation inverted the effect of increasing ionic strength, whereas modification of arginine with phenylglyoxal did not. These results were noted in both photochemical and pulse-radiolysis assays. It appears that interaction of O2- with the anionic enzyme is assisted by the positive charge on lysine residues, presumably those close to the active site. By the criterion of responsiveness to ionic strength, the arginine residue close to the active site does not appear to provide electrostatic facilitation to the catalytic process. Elimination of the charge on epsilon-amino groups by raising the pH suppressed activity to the same extent as did elimination of these charges by acetylation. Activity was similarly suppressed to the same extent by covalent modification or by ionization of arginine residues, indicating that the positive charge on arginine is important for the catalytic process even though its effect is not responsive to changes in the ionic strength of the solution.

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Crossref · 10.1016/s0021-9258(18)33779-7

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  • Several studies have been carried out using pulsed radiolysis to generate HO2•/O2•− and to understand the Cu,Zn-SOD-catalysed reaction of superoxide dismutation.

    “Several studies have been carried out using pulsed radiolysis to generate HO2•/O2•− and to understand the Cu,Zn-SOD-catalysed reaction of superoxide dismutation [74,75,76,77], Figure 32.”

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Authors
Cudd, A., & Fridovich, I.
Affiliations
Duke Medical Center (US)
ORCID
Cudd, A
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1982-10
Volume
257
Issue
19
Pages
11443-11447
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1592323860
Cited by
211
References
28
Citations by year
2024: 1 · 2023: 1 · 2021: 2 · 2020: 4 · 2019: 4 · 2017: 4 · 2016: 2 · 2015: 3 · 2014: 8 · 2013: 1 · 2012: 2
FWCI
9.01
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glutathione Transferases and Polymorphisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
superoxide dismutase, electrostatic interactions, ionic strength, lysine residues, arginine residues, acetylation, succinylation, phenylglyoxal modification, copper-zinc enzyme, superoxide, enzyme mechanism, pH dependence
MeSH terms
Amino Acids, Animals, Cattle, Erythrocytes, Hydrogen-Ion Concentration, Kinetics, Osmolar Concentration, Superoxide Dismutase

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