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Profiling Thiol Redox Proteome Using Isotope Tagging Mass Spectrometry
Published on: March 24, 2012
Characterization of a ferredoxin:NADP+ oxidoreductase from a nonphotosynthetic plant tissue
M Hirasawa1, K T Chang, D B Knaff
1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock 79409-1061.
Abstract:
A flavoprotein with properties similar to those of ferredoxin:NADP+ oxidoreductases found in the leaves of higher plants has been purified to apparent homogeneity from bean sprouts, a nonphotosynthetic plant tissue. The absorbance and circular dichroism spectra of the bean sprout protein are similar to those of spinach leaf ferredoxin:NADP+ oxidoreductase and an antibody raised against the spinach enzyme recognized the bean sprout enzyme. The bean sprout enzyme catalyzed ferredoxin-dependent electron transfer from NADPH to equine cytochrome c at a high rate but, unlike the spinach enzyme, exhibited little NADPH to 2,6-dichlorophenol indophenol diaphorase activity. The bean sprout enzyme forms a 1:1 electrostatically stabilized complex with ferredoxins isolated from either bean sprouts or spinach leaves.
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