Mmm2p, a mitochondrial outer membrane protein required for yeast mitochondrial shape and maintenance of mtDNA nucleoids.

Mmm2p, a mitochondrial outer membrane protein required for yeast mitochondrial shape and maintenance of mtDNA nucleoids.
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DOI:
10.1083/jcb.200308012
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发表时间:
2004-03-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Jensen RE
Jensen RE
中科院分区:
其他
文献类型:
--
作者:
Youngman MJ;Hobbs AE;Burgess SM;Srinivasan M;Jensen RE

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线粒体外膜蛋白Mmm1p是酵母正常线粒体形状所必需的。为了鉴定新的形态蛋白,我们分离了与mmm1-1突变体不相容的突变。其中一种突变体mmm2-1在一种新的外膜蛋白中存在缺陷。缺乏Mmm2p会导致线粒体形状缺陷和线粒体DNA (mtDNA)类核的丢失。比如mm1蛋白(Aiken Hobbs, a.e., M. Srinivasan, J.M. McCaffery, R.E. Jensen, 2001)。Mmm2p位于线粒体表面的点状颗粒中,其中许多位于mtDNA类核附近。虽然一些含有Mmm2p的斑点与含有Mmm1p的斑点共定位,但至少有一些Mmm2p与Mmm1p是分开的。此外,虽然Mmm2p和Mmm1p似乎都是大型复合物的一部分,但我们发现Mmm2p和Mmm1p不稳定地相互作用,似乎是两种不同结构的成员。我们推测Mmm2p和Mmm1p是独立机制的组成部分,它们的动态相互作用是维持线粒体形状和mtDNA结构所必需的。
The mitochondrial outer membrane protein, Mmm1p, is required for normal mitochondrial shape in yeast. To identify new morphology proteins, we isolated mutations incompatible with the mmm1-1 mutant. One of these mutants, mmm2-1, is defective in a novel outer membrane protein. Lack of Mmm2p causes a defect in mitochondrial shape and loss of mitochondrial DNA (mtDNA) nucleoids. Like the Mmm1 protein (Aiken Hobbs, A.E., M. Srinivasan, J.M. McCaffery, and R.E. Jensen. 2001. J. Cell Biol. 152:401–410.), Mmm2p is located in dot-like particles on the mitochondrial surface, many of which are adjacent to mtDNA nucleoids. While some of the Mmm2p-containing spots colocalize with those containing Mmm1p, at least some of Mmm2p is separate from Mmm1p. Moreover, while Mmm2p and Mmm1p both appear to be part of large complexes, we find that Mmm2p and Mmm1p do not stably interact and appear to be members of two different structures. We speculate that Mmm2p and Mmm1p are components of independent machinery, whose dynamic interactions are required to maintain mitochondrial shape and mtDNA structure.
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