...
首页> 外文期刊>Biochemistry >Peroxtdative Modification of a Membrane Protein. Conformation-Dependent Chemical Modification of Adenine Nucleotide Translocase in Cu~(2+)/tert-Butyl Hydroperoxide Treated Mitochondria
【24h】

Peroxtdative Modification of a Membrane Protein. Conformation-Dependent Chemical Modification of Adenine Nucleotide Translocase in Cu~(2+)/tert-Butyl Hydroperoxide Treated Mitochondria

机译:膜蛋白的过氧化修饰。 Cu〜(2 +)/叔丁基过氧化氢处理线粒体中腺嘌呤核苷酸转位酶的构象依赖性化学修饰

获取原文
获取原文并翻译 | 示例
           

摘要

Peroxidative treatment of rat heart mitochondria results in a gradual increase of the apparent molecular weight of the adenine nucleotide translocase (ANT) by up to 1.2 kDa. ANT isolated from mitochondria treated with 1 mM ter-/-butyl hydroperoxide and 5-40 μM Cu~(2+) for l h at 37 °C exhibited a progressive loss of lysine, cysteine, arginine, and valine residues compared to native ANT. N-Ethylmaleimide, dithiothreitol, and the specific inhibitor of ANT, carboxyatractyloside (CAT), inhibited the peroxidation4nduced molecular weight shift without inhibiting lipid peroxidation, which is believed to be the primary cause of the observed ANT modification Bongkrekic acid, which stabilizes ANT in a conformation different from that brought about by CAT, did not inhibit the ANT molecular weight shift. Dithiothreitol, as well as CAT, was found to protect ANT against most of the losses of amino acid residues, indicating that alteration of sulfhydryl residues is required for chemical modification of, not only cysteine, but also lysine, arginine, and valine. We conclude that the peroxidative modification of ANT is conformation-dependent and involves chemical modification of cysteine as a critical step.
机译:大鼠心脏线粒体的过氧化处理导致腺嘌呤核苷酸转位酶(ANT)的表观分子量逐渐增加高达1.2 kDa。与天然ANT相比,在37°C下用1 mM叔丁基氢过氧化物和5-40μMCu〜(2+)处理的线粒体中分离的ANT表现出赖氨酸,半胱氨酸,精氨酸和缬氨酸残基的逐步损失。 N-乙基马来酰亚胺,二硫苏糖醇和ANT的特异抑制剂羧基白术苷(CAT)抑制过氧化作用引起的分子量变化,而又不抑制脂质过氧化作用,这被认为是观察到的ANT修饰的Bongkrekic酸的主要原因,它使ANT稳定在不同于CAT所产生的构象,并没有抑制ANT分子量的变化。已发现二硫苏糖醇以及CAT可以保护ANT免受大多数氨基酸残基的损失,这表明巯基残基的改变不仅需要对半胱氨酸进行化学修饰,而且还需要对赖氨酸,精氨酸和缬氨酸进行化学修饰。我们得出的结论是,ANT的过氧化修饰是构象依赖性的,涉及半胱氨酸的化学修饰是关键步骤。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号