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- W2000476043 abstract "Arginase (l-arginine amidinohydrolase, EC 3.5.3.1) can efficiently catalyze conversion of arginine to ornithine. Therefore, this enzyme can be used to produce l-ornithine from l-arginine. In this article, the l-arginase gene encoding the Geobacillus thermodenitrificans NG80-2 was cloned and overexpressed in Escherichia coli. The specific activity of the purified enzyme was 138.3 U/mg. The molecular mass of the l-arginase was approximately 33.0 kDa as estimated by SDS-PAGE and 192.0 kDa as determined by gel-filtration chromatography. Manganese ions were the optimum metal cofactor for activity, whereas the enzyme was slightly inhibited by Mg(2+) , Cu(2+) , Ba(2+) , Ca(2+) , and Zn(2+) . Activity was optimal at pH 9.0 and 80 °C, and the protein was stable at 40 and 50 °C. The recombinant enzyme was a uricotelic arginase. Using arginine as the substrate, the Michaelis-Menten constant (Km ) and catalytic efficiency (kcat /Km ) were measured to be 171.9 mM and 3.8 mM(-1) s(-1) , respectively. Trp and His residues were directly involved in the l-arginase activity evaluated by inactivation agents. The biosynthesis yield of l-ornithine by the purified enzyme was 36.9 g/L, and the molar yield was 97.2%." @default.
- W2000476043 created "2016-06-24" @default.
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- W2000476043 date "2015-06-24" @default.
- W2000476043 modified "2023-09-27" @default.
- W2000476043 title "Cloning, expression, and characterization of a thermostable<scp>l</scp>-arginase from<i>Geobacillus thermodenitrificans</i>NG80-2 for<scp>l</scp>-ornithine production" @default.
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- W2000476043 doi "https://doi.org/10.1002/bab.1385" @default.
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