Back to Search
Start Over
Radiation-induced enhancement of nitrite reducing activity of cytochrome c.
- Source :
-
Journal of agricultural and food chemistry [J Agric Food Chem] 2003 Nov 05; Vol. 51 (23), pp. 6835-43. - Publication Year :
- 2003
-
Abstract
- Commercial cytochrome c (Cyt c) was irradiated with Co-60 gamma-rays in the dose range of up to 3.0 kGy to investigate the enhancement of the nitrite reducing activity of Cyt c. The optimum irradiation dose to induce nitrite reducing activity for 30 muM Cyt c solution was 1.0 kGy under an O(2) atmosphere. The nitrite reducing activity of Cyt c irradiated at this dose was approximately 45-fold that of unirradiated Cyt c and ca. 1.2-fold that of nitrite reductase. The irradiation treatment resulted in unfolding of the peptide chain, exposure of the heme group, oxidation of methionine to methionine sulfoxide, dissociation of the sixth ligand (Met), and occurrence of autoxidation in Cyt c. Sepharose-immobilized irradiated Cyt c had a similar activity to that in solution. The resin retained the activity after five uses even after 1 year of storage. The irradiated Cyt c will be able to be used as a substitute for nitrite reductase.
Details
- Language :
- English
- ISSN :
- 0021-8561
- Volume :
- 51
- Issue :
- 23
- Database :
- MEDLINE
- Journal :
- Journal of agricultural and food chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 14582983
- Full Text :
- https://doi.org/10.1021/jf0345651