S-Nitrosylation of mitochondrial caspases.

S-Nitrosylation of mitochondrial caspases.
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DOI:
10.1083/jcb.200104008
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发表时间:
2001-09-17
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Gaston B
Gaston B
中科院分区:
其他
文献类型:
--
作者:
Mannick JB;Schonhoff C;Papeta N;Ghafourifar P;Szibor M;Fang K;Gaston B

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Caspase-3是一种半胱氨酸蛋白酶,位于细胞质和线粒体膜间隙,是许多凋亡途径的中心效应子。在静息细胞中,一部分半胱氨酸蛋白酶-3酶原在活性位点半胱氨酸处发生S-亚硝基化,抑制酶活性。在Fas诱导的细胞凋亡过程中,半胱天冬酶被脱亚硝基化,使催化位点发挥作用。在目前的研究中,我们试图确定由S-亚硝基化调控的半胱天冬酶亚群。我们报告说,大多数线粒体,但不是细胞质,caspase-3酶原含有这种抑制性的修改。此外,大多数线粒体caspase-9是S-亚硝基化的。这些研究表明,S-亚硝基化在调节线粒体caspase功能中起着重要作用,并且给定蛋白质的S-亚硝基化状态取决于其亚细胞定位。
Caspase-3 is a cysteine protease located in both the cytoplasm and mitochondrial intermembrane space that is a central effector of many apoptotic pathways. In resting cells, a subset of caspase-3 zymogens is S-nitrosylated at the active site cysteine, inhibiting enzyme activity. During Fas-induced apoptosis, caspases are denitrosylated, allowing the catalytic site to function. In the current studies, we sought to identify the subpopulation of caspases that is regulated by S-nitrosylation. We report that the majority of mitochondrial, but not cytoplasmic, caspase-3 zymogens contain this inhibitory modification. In addition, the majority of mitochondrial caspase-9 is S-nitrosylated. These studies suggest that S-nitrosylation plays an important role in regulating mitochondrial caspase function and that the S-nitrosylation state of a given protein depends on its subcellular localization.
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