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Characterization of a new enzyme oxidizing ω-amino group of aminocarboxyric acid, aminoalcohols and amines from Phialemonium sp. AIU 274

Isobe, Kimiyasu, Sasaki, Tomoko, Aigami, Yuusuke, Yamada, Miwa, Kishino, Shigenobu, Ogawa, Jun
Journal of Molecular Catalysis. B, Enzymatic 2013 v.96 pp. 89-95
amino acids, amino alcohols, aromatic amines, carbon, catalytic activity, copper, deamination, diamines, enzyme activity, fungi, isoniazid, monoamines, substrate specificity
A new enzyme exhibiting oxidase activity for ω-aminocarboxylic acids, ω-aminoalcohols, monoamines and diamines was found from a newly isolated fungal strain, Phialemonium sp. AIU 274. The enzyme also oxidized aromatic amines, but not l- and d-amino acids. The Vmax/Km value for hexylamine was higher than those for 6-aminoalcohol and 6-aminhexanoic acid in the aliphatic C6 substrates. In the aliphatic amines, the higher Vmax/Km values were obtained by the longer carbon chain amines. Thus, the enzyme catalyzed oxidative deamination of the ω-amino group in a wide variety of the ω-amino compounds and preferred medium- and long-chain substrates. The oxidase with such broad substrate specificity was first reported here. The enzyme contained copper, and the enzyme activity was strongly inhibited by isoniazid, iproniazid and semicarbazide, but not by clorgyline and pargyline. The enzyme was composed of two identical subunits of 75kDa.