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Rhodanese was isolated and purified from the cytosolic fraction of liver tissue homogenate of the fruit bat, Eidolon helvum, by using ammonium sulphate precipitation and CM-Sephadex C-50 ion exchange chromatography. The specific activity was increased 130-fold with a 53% recovery. The K(m) values for KCN and Na(2)S(2)O(3) as substrates were 13.5 +/- 2.2mM and 19.5 +/- 0.7 mM, respectively. The apparent molecular weight was estimated by gel filtration on a Sephadex G-100 column to be 36,000 Da. The optimal activity was found at a high pH (pH 9.0) and the temperature optimum was 35 degrees C. An Arrhenius plot of the heat stability data consisted of two linear segments with a break occurring at 35 degrees C. The apparent activation energy values from these slopes were 11.5 kcal/mol and 76.6 kcal/mol. Inhibition studies on the enzyme with a number of cations showed that Mg(2+), Mn(2+), Ca(2+), and Co(2+) did not affect the activity of the enzyme, but Hg(2+) and Ba(2+) inhibited the enzyme.

Presence of Rhodanese in the Cytosolic Fraction of the Fruit Bat (Eidolon helvum) Liver