Abstract
L-Amino acid oxidase (L-AAO) was purified from the solid state-grown cultures of A. oryzae ASH (JX006239.1) by fractional salting out, followed by ion exchange and gel filtration chromatography, to its molecular homogeneity, displaying 3.38-fold purification in comparison with the crude enzyme. SDS-PAGE revealed the enzyme to be a homo-dimer with ∼55-kDa subunits, with approximate molecular weight on native PAGE of 105–110 kDa. Two absorption maxima, at 280 nm and 341 nm, for the apoproteinic and FMN prosthetic group of the enzyme, respectively, were observed, with no detected surface glycosyl residues. The enzyme had maximum activity at pH 7.8–8.0, with ionic structural stability within pH range 7.2–7.6 and pH precipitation point (pI) 4.1–5.0. L-AAO exhibited the highest activity at 55°C, with plausible thermal stability below 40°C. The enzyme had T 1/2 values of 21.2, 8.3, 3.6, 3.1, 2.6 h at 30, 35, 40, 50, 60°C with Tm 61.3°C. Kinetically, A. oryzae L-AAO displayed a broad oxidative activity for tested amino acids as substrates. However, the enzyme had a higher affinity towards basic amino acid L-lysine (K m 3.3 mM, K cat 0.04 s−1) followed by aromatic amino acids L-tyrosine (K m 5.3 mM, K cat 0.036 s−1) and L-phenylalanine (K m 6.6 mM), with 1ow affinity for the S-amino acid L-methionine (K m 15.6 mM). The higher specificity of A. oryzae L-AAO to L-lysine as substrate seems to be a unique property comparing to this enzyme from other microbes. The enzyme was significantly inhibited by hydroxylamine and SDS, with slight inhibition by EDTA. The enzyme had a little effect on AST and ALT, with no effect on platelet aggregation and blood hemolysis in vivo with an obvious cytotoxic effect towards HepG2 (IC50 832.2 μg/mL) and MCF-7 (IC50, 370.6 μg/mL) tumor cells in vitro.
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El-Sayed, A.S., Shindia, A.A. & Zaher, Y.A. Purification and characterization of L-amino acid oxidase from the solid-state grown cultures of Aspergillus oryzae ASH. Microbiology 82, 762–771 (2013). https://doi.org/10.1134/S0026261713060143
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DOI: https://doi.org/10.1134/S0026261713060143