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首页> 外文期刊>Journal of biochemical and molecular toxicology >Methylglyoxal inhibition of cytosolic ascorbate peroxidase from Nicotiana tabacum
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Methylglyoxal inhibition of cytosolic ascorbate peroxidase from Nicotiana tabacum

机译:甲基乙二醛对烟草中胞质抗坏血酸过氧化物酶的抑制作用

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摘要

Methylglyoxal (MG) is one of the aldehydes accumulated in plants under environmental stress. Cytosolic ascorbate peroxidase (cAPX) plays a key role in the protection of cells from oxidative damage by scavenging reactive oxygen species in higher plants. A cDNA encoding cAPX, named NtcAPX, was isolated from Nicotiana tabacum. We characterized recombinant NtcAPX (rNtcAPX) as a fusion protein with glutathione S-transferase to investigate the effects of MG on APX. NtcAPX consists of 250 amino acids and has a deduced molecular mass of 27.5 kDa. The rNtcAPX showed a higher APX activity. MG treatments resulted in a reduction of APX activity and modifications of amino groups in rNtcAPX with increasing K m for ascorbate. On the contrary, neither NaCl nor cadmium reduced the activity of APX. The present study suggests that inhibition of APX is in part due to the modification of amino acids by MG.
机译:甲基乙二醛(MG)是环境胁迫下植物体内积累的醛类之一。胞质抗坏血酸过氧化物酶(cAPX)通过清除高等植物中的活性氧,在保护细胞免受氧化损伤中起关键作用。从烟草(Nicotiana tabacum)分离出编码cAPX的cDNA,命名为NtcAPX。我们将重组NtcAPX(rNtcAPX)表征为与谷胱甘肽S-转移酶的融合蛋白,以研究MG对APX的影响。 NtcAPX由250个氨基酸组成,推定分子量为27.5 kDa。 rNtcAPX显示较高的APX活性。 MG处理导致抗坏血酸的K m增加,导致APX活性降低和rNtcAPX中的氨基修饰。相反,NaCl和镉都不会降低APX的活性。本研究表明抑制APX部分是由于MG对氨基酸的修饰。

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