Superoxide dismutase as a novel macromolecular nitric oxide carrier: Preparation and characterization

Ssu Han Chen, Shih Jiuan Chiu, Teh Min Hu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Nitric oxide (NO) is an important molecule that exerts multiple functions in biological systems. Because of the short-lived nature of NO, S-nitrosothiols (RSNOs) are believed to act as stable NO carriers. Recently, sulfhydryl (SH) containing macromolecules have been shown to be promising NO carriers. In the present study, we aimed to synthesize and characterize a potential NO carrier based on bovine Cu,Zn-superoxide dismutase (bSOD). To prepare S-nitrosated bSOD, the protein was incubated with S-nitrosoglutathione (GSNO) under varied experimental conditions. The results show that significant S-nitrosation of bSOD occurred only at high temperature (50 °C) for prolonged incubation time (>2 h). S-nitrosation efficiency increased with reaction time and reached a plateau at ~4 h. The maximum amount of NO loaded was determined to be about 0.6 mol SNO/mol protein (~30% loading efficiency). The enzymatic activity of bSOD, however, decreased with reaction time. Our data further indicate that NO functionality can only be measured in the presence of extremely high concentrations of Hg2+ or when the protein was denatured by guanidine. Moreover, mildly acidic pH was shown to favor S-nitrosation of bSOD. A model based on unfolding and refolding of bSOD during preparation was proposed to possibly explain our observation.

Original languageEnglish
Pages (from-to)13985-14001
Number of pages17
JournalInternational Journal of Molecular Sciences
Volume13
Issue number11
DOIs
Publication statusPublished - 2012

Fingerprint

inorganic peroxides
Nitric oxide
nitric oxide
Superoxide Dismutase
Nitric Oxide
preparation
Nitrosation
proteins
Proteins
reaction time
S-Nitrosothiols
S-Nitrosoglutathione
guanidines
Guanidine
Biological systems
Macromolecules
macromolecules
Superoxide Dismutase-1
plateaus
Observation

Keywords

  • Nitric oxide
  • S-nitrosation
  • S-nitrosoglutathione
  • S-nitrosothiols
  • Superoxide dismutase

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Spectroscopy
  • Inorganic Chemistry
  • Catalysis
  • Molecular Biology
  • Computer Science Applications
  • Medicine(all)

Cite this

Superoxide dismutase as a novel macromolecular nitric oxide carrier : Preparation and characterization. / Chen, Ssu Han; Chiu, Shih Jiuan; Hu, Teh Min.

In: International Journal of Molecular Sciences, Vol. 13, No. 11, 2012, p. 13985-14001.

Research output: Contribution to journalArticle

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