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A homodimeric l-amino acid oxidase enzyme (Cv-LAAOI) was isolated from the venom of Cerastes vipera (Egyptian Sand viper) using gel filtration followed by anion exchange chromatography. The molecular mass of Cv-LAAO is 120 kDa in its native form and 60 kDa in its monomeric form. The optimum enzyme activity was achieved on l-Leucine as a substrate in 50 mM buffer pH 7.5 at 50 °C. The Cv-LAAOI activity...
Dolabellanin A (DAA), an antineoplastic protein of an ocean mollusk, was shown to have l-amino acid oxidase (LAAO, EC 1.4.3.2) activity. With the addition of DAA, a cytotoxic concentration of hydrogen peroxide was detected in the culture medium of EL-4 murine lymphoma cells. The cytotoxicity of DAA was suppressed by antioxidants, especially by catalase. The hydrogen peroxide produced by the LAAO activity...
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