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Influence of copper on the interaction between cytochrome c and sulfite in vitro
Author(s) -
Wang Jinsheng,
Guo Dongsheng,
Yuan Xiaoying
Publication year - 2006
Publication title -
journal of biochemical and molecular toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.526
H-Index - 58
eISSN - 1099-0461
pISSN - 1095-6670
DOI - 10.1002/jbt.20143
Subject(s) - sulfite , chemistry , cytochrome c , copper , cytochrome , sulfur dioxide , inorganic chemistry , biochemistry , organic chemistry , enzyme , mitochondrion
The quantitative influence of copper on the interaction between cytochrome c and sulfite, which is a derivate of sulfur dioxide in the human body, has been studied by fluorescence spectrometry and ultraviolet absorption spectrometry in vitro. The results indicate that copper may intensely combine with protein component and ferroporphyrin component in cytochrome c at the concentration of 0.1 mM, and the respective association constants ( K A ) are 3.77 × 10 4 L mol −1 and 9.38 × 10 3 L mol −1 . Sulfite has little interaction with the protein component in cytochrome c ( K A = 0.094 L mol −1 ), at either low concentrations or relatively high concentrations (<0.15 M). However, it can react with the ferroporphyrin component in cytochrome c ( K A = 4.297 L mol −1 ). After copper is added to the sulfite–cytochrome c binary systems, the reaction between sulfite and the protein component in cytochrome c is obviously strengthened at a low concentration ( K A = 7.289 L mol −1 ), while the addition of copper merely has a little effect on the interaction between sulfite and the ferroporphyrin component in cytochrome c. © 2006 Wiley Periodicals, Inc. J Biochem Mol Toxicol 20:255–258, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/jbt.20143