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A new l-amino acid oxidase (designated as DRS-LAAO) was purified from Daboia russellii siamensis venom by ion-exchange, gel filtration and affinity chromatographies. DRS-LAAO is a homodimeric enzyme with a molecular weight of 120.0kDa as measured by size exclusion chromatography and the monomeric molecular weight of 58.0kDa as measured by SDS-PAGE under both non-reducing and reducing conditions. The...
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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