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- W2090972452 abstract "This study describes the characterization of 80 kDa protease showing gelationlytic property among three proteases in the excretory/secretory proteins (ESP) from Toxoplasma gondii. The protease activity was detected in the ESP but not in the somatic extract of RH tachyzoites. This protease was active only in the presence of calcium ion but not other divalent cationic ions such as Cu2+, Zn2+, Mg2+, and Mn2+, implying that Ca2+ is critical factor for the activation of the protease. The 80 kDa protease was optimally active at pH 7.5. Its gelatinolytic activity was maximal at 37â, and significant level of enzyme activity of the protease remained after heat treatment at 56â for 30 min or 100â for 10 min. This thermostable enzyme was strongly inhibited by metal chelators, i.e., EDTA, EGTA, and 1,10-phenanthroline. Thus, the 80 kDa protease n the ESP secreted by T. gondii was classified as a calcium dependent neutral metalloprotease. Key words: Toxoplasma gondii, excretory/secretory proteins, gelatinolytic activity, thermostable, metalloprotease" @default.
- W2090972452 created "2016-06-24" @default.
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- W2090972452 date "2003-01-01" @default.
- W2090972452 modified "2023-10-06" @default.
- W2090972452 title "Protease activity of 80 kDa protein secreted from the apicomplexan parasite Toxoplasma gondii" @default.
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- W2090972452 doi "https://doi.org/10.3347/kjp.2003.41.3.165" @default.
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