Next Article in Journal
Bacterial Exopolysaccharides: Functionality and Prospects
Next Article in Special Issue
Protection against Ischemia-Induced Oxidative Stress Conferred by Vagal Stimulation in the Rat Heart: Involvement of the AMPK-PKC Pathway
Previous Article in Journal
Novel High-Viscosity Polyacrylamidated Chitosan for Neural Tissue Engineering: Fabrication of Anisotropic Neurodurable Scaffold via Molecular Disposition of Persulfate-Mediated Polymer Slicing and Complexation
Previous Article in Special Issue
High Mitochondrial DNA Copy Number and Bioenergetic Function Are Associated with Tumor Invasion of Esophageal Squamous Cell Carcinoma Cell Lines
Int. J. Mol. Sci. 2012, 13(11), 13985-14001; doi:10.3390/ijms131113985
Article

Superoxide Dismutase as a Novel Macromolecular Nitric Oxide Carrier: Preparation and Characterization

1
, 2
 and 1,*
Received: 28 September 2012; in revised form: 24 October 2012 / Accepted: 25 October 2012 / Published: 29 October 2012
(This article belongs to the Special Issue Advances in Free Radicals in Biology and Medicine)
View Full-Text   |   Download PDF [608 KB, uploaded 19 June 2014]   |   Browse Figures
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.
Keywords: superoxide dismutase; nitric oxide; S-nitrosation; S-nitrosothiols; S-nitrosoglutathione superoxide dismutase; nitric oxide; S-nitrosation; S-nitrosothiols; S-nitrosoglutathione
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Chen, S.-H.; Chiu, S.-J.; Hu, T.-M. Superoxide Dismutase as a Novel Macromolecular Nitric Oxide Carrier: Preparation and Characterization. Int. J. Mol. Sci. 2012, 13, 13985-14001.

AMA Style

Chen S-H, Chiu S-J, Hu T-M. Superoxide Dismutase as a Novel Macromolecular Nitric Oxide Carrier: Preparation and Characterization. International Journal of Molecular Sciences. 2012; 13(11):13985-14001.

Chicago/Turabian Style

Chen, Ssu-Han; Chiu, Shih-Jiuan; Hu, Teh-Min. 2012. "Superoxide Dismutase as a Novel Macromolecular Nitric Oxide Carrier: Preparation and Characterization." Int. J. Mol. Sci. 13, no. 11: 13985-14001.


Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert