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학술저널
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충북대학교 동물의학연구소 Journal of Biomedical and Translational Research Journal of Biomedical and Translational Research 제21권 제1호
발행연도
2020.1
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17 - 23 (7page)

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Lysyl oxidase-variant 2 (LOX-v2) is a novel variant of lysyl oxidase (LOX) that functions as an amine oxidase for the formation of lysine-mediated crosslinks found in collagen and elastin fibrils. In addition to the amine oxidase activity in the extracellular matrix, several novel functions, such as tumor suppression, tumor progression, chemotaxis, cellular senescence, and modification of histones, have been assigned to LOX. In recent years, it has been reported that LOX is also present in nuclear locations, suggesting a novel functional role of LOX in the nucleus. To test the amine oxidase activity of LOX and LOX-v2 to nuclear histone proteins, we expressed and purified LOX and LOX-v2 as recombinant forms and then assessed the amine oxidase activity toward histone H2A in in vitro peroxidase-coupled fluorometric assays. Both LOX and LOX-v2 proteins showed significant levels of amine oxidase activity toward histone H2A in a β-aminopropionitrile-inhibitable manner. In immunofluorescence staining after ectopic expression in cultured cells, LOX was observed in the perinuclear, cytoplasmic, and extracellular areas, whereas LOX-v2 was predominantly detected in the nucleoplasm with a punctuate pattern. These findings suggest that LOX-v2 may play a novel functional role in the nucleus through the amine oxidase activity to the nuclear histone proteins. Elucidation of the specific functional roles of LOX-v2, such as substrate specificity toward different types of nuclear proteins and detailed analysis on subnuclear localization, will provide a significant clue in understanding the diverse functional roles currently assigned to a single enzyme, LOX.

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