Cleavage of Mcd1 by caspase-like protease Esp1 promotes apoptosis in budding yeast.

Cleavage of Mcd1 by caspase-like protease Esp1 promotes apoptosis in budding yeast.
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半胱天冬酶样蛋白酶 Esp1 对 Mcd1 的裂解可促进芽殖酵母细胞凋亡。

DOI:
10.1091/mbc.e07-11-1113
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发表时间:
2008
影响因子:
3.3
通讯作者:
Zhang,Zhaojie
Zhang,Zhaojie
中科院分区:
生物学3区
文献类型:
--
作者:
Yang,Hui;Ren,Qun;Zhang,Zhaojie

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在过去的十年中,酵母已被成功地用作研究凋亡细胞死亡的分子机制的模型系统。在这里,我们报告,Mcd 1,酵母同源性的人cohesin Rad 21,在过氧化氢诱导的酵母细胞凋亡中起着重要作用。在诱导细胞死亡时,Mcd 1被切割,C-末端片段从细胞核易位到线粒体中,导致线粒体膜电位降低,并以细胞色素依赖性方式放大细胞死亡。我们进一步证明,半胱天冬酶样蛋白酶Esp 1具有双重功能,它是负责过氧化氢诱导的细胞凋亡过程中的Mcd 1的切割。当细胞凋亡被诱导时,Esp 1从后期抑制剂Pds 1释放。激活的Esp 1作为半胱天冬酶样蛋白酶切割Mcd 1,其通过从细胞核易位到线粒体而促进细胞死亡。
Over the last decade, yeast has been used successfully as a model system for studying the molecular mechanism of apoptotic cell death. Here, we report that Mcd1, the yeast homology of human cohesin Rad21, plays an important role in hydrogen peroxide-induced apoptosis in yeast. On induction of cell death, Mcd1 is cleaved and the C-terminal fragment is translocated from nucleus into mitochondria, causing the decrease of mitochondrial membrane potential and the amplification of cell death in a cytochromec-dependent manner. We further demonstrate that the caspase-like protease Esp1 has dual functions and that it is responsible for the cleavage of Mcd1 during the hydrogen peroxide-induced apoptosis. When apoptosis is induced, Esp1 is released from the anaphase inhibitor Pds1. The activated Esp1 acts as caspase-like protease for the cleavage of Mcd1, which enhances the cell death via its translocation from nucleus to mitochondria.
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