Abstract
S-Sulfoglutathione is reduced by reduced ferredoxin and ferredoxin dependent sulfite reductase (Fd-SiR) from the cyanobacterium Spirulina platensis. The Km value calculated from a Lineweaver-Burk plot of the data was 6.0 × 10-5 m. A plot of ferredoxin concentration versus reduction activity of S-sulfoglutathione (GSSO3H) of Fd-SiR yielded a sigmoidal curve, giving a Hill coefficient (n) of 3.0. Antiserum against Fd-SiR strongly inhibits this reaction. In an experiment using a crude cell extract, the GSS03H reducing activity was only found at the site of Fd-SiR in gel filtration and immunoblotting.
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