The mitochondrial fission adaptors Caf4 and Mdv1 are not functionally equivalent.

The mitochondrial fission adaptors Caf4 and Mdv1 are not functionally equivalent.
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DOI:
10.1371/journal.pone.0053523
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Shaw JM
Shaw JM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Guo Q;Koirala S;Perkins EM;McCaffery JM;Shaw JM

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真核生物的线粒体裂变是由包围和分裂线粒体小管的蛋白质复合物介导的。在出芽酵母中,分裂需要膜锚定蛋白Fis1和动力蛋白相关的GTPase Dnm1。Dnm1通过与直接与Fis1结合的衔接蛋白Caf4和Mdv1的相互作用被招募到线粒体。与Mdv1不同,Caf4在线粒体膜断裂中的功能尚未确定。在这项研究中,我们证明了Caf4是一个真正的裂变接头,组装在线粒体分裂的位置。我们还表明,裂变复合体可以单独含有Caf4或同时含有Caf4和Mdv1,而不影响裂变功能。虽然Caf4和Mdv1表达水平与其对裂变的贡献之间存在对应关系,但这两种接头蛋白并不等同。相反,我们的功能和系统发育分析表明,Caf4线粒体分裂活动与Mdv1不同。
Mitochondrial fission in eukaryotes is mediated by protein complexes that encircle and divide mitochondrial tubules. In budding yeast, fission requires the membrane-anchored protein Fis1 and the dynamin-related GTPase Dnm1. Dnm1 is recruited to mitochondria via interactions with the adaptor proteins Caf4 and Mdv1, which bind directly to Fis1. Unlike Mdv1, a function for Caf4 in mitochondrial membrane scission has not been established. In this study, we demonstrate that Caf4 is a bona fide fission adaptor that assembles at sites of mitochondrial division. We also show that fission complexes may contain Caf4 alone or both Caf4 and Mdv1 without compromising fission function. Although there is a correspondence between Caf4 and Mdv1 expression levels and their contribution to fission, the two adaptor proteins are not equivalent. Rather, our functional and phylogenetic analyses indicate that Caf4 mitochondrial fission activity has diverged from that of Mdv1.
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