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      • Characterization of Thioltransferase from Kale

        Jae-Hoon Sa,Mi-Young Yang,Byung-Lim Song,Chang-Jin Lem 강원대학교 기초과학연구소 1997 기초과학연구 Vol.8 No.-

        Thioltransferase, also known as glutaredoxin, is an enzyme that catalyzes the reduction of a variety of disulfides, including protein disulfides, in the presence of reduced glutathione. Thioltransferase was purified from kale through ammonium sulfate fractionation, DE-52 ion-exchange chromatography, Sephadex G-75 gel filtration, and Q-Sepharose ion-exchange chromatography. Its molecular size was estimated to be about 13,000 daltons on SDS- PAGE. The purified enzyme has an optimum pH of about 8.0 with 2-hydroxyethyl disulfide as a substrate. The enzyme also utilizes L-sulfocysteine, L-cystine, bovine serum albumin, and insulin as substrates in the presence of GSH. The enzyme has Km values of 0.24-0.67 mM against these substrates. The enzyme was partly inactivated after heating at 80℃ or higher temperature. The enzyme was greatly activated by various thiol compounds such as reduced glutathione, dithiothreitol, L-cysteine and β-mercaptoethanol. This is a second example of plant thioltransferase, which was purified and characteried

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