Abstract
L-lysine-α-oxidase (LO) synthesized by the fungus Trichoderma cf. aureoviride Rifai VKM F-4268D under salt stress conditions was isolated and characterized. The newly developed method for the isolation and purification of the enzyme was based on its precipitation from the culture liquid by copper sulfate. The subsequent LO purification by the methods of hydrophobic (Octyl Sepharose) and ion exchange (DEAE ToyoPearl) chromatography yielded a homogeneous enzyme preparation with a high degree of purification (310-fold) and high specific activity (90 U/mg protein). The molecular mass of the enzyme determined by gel filtration and native electrophoresis was 115–116 kDa. According to the data of SDS electrophoresis, LO was a dimer with identical subunits (57–58 kDa). The optical absorption spectrum of LO corresponded to the flavoprotein spectrum with maximums at 278, 390, and 465 (a shoulder at 490) nm. LO is a stereospecific enzyme oxidizing almost exclusively L-lysine (pH optimum 7.8–8.2). Insignificant activity was observed against L-ornithine and L-arginine. LO was shown to be stable at temperatures up to 50°C.
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Original Russian Text © A.Yu. Arinbasarova, V.V. Ashin, K.V. Makrushin, A.G. Medentsev, E.V. Lukasheva, T.T. Berezov, 2012, published in Mikrobiologiya, 2012, Vol. 81, No. 5, pp. 594–599.
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Arinbasarova, A.Y., Ashin, V.V., Makrushin, K.V. et al. Isolation and properties of L-lysine-α-oxidase from the fungus Trichoderma cf. aureoviride RIFAI VKM F-4268D. Microbiology 81, 549–554 (2012). https://doi.org/10.1134/S0026261712050037
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DOI: https://doi.org/10.1134/S0026261712050037