期刊
MOLECULAR CELL
卷 56, 期 5, 页码 641-652出版社
CELL PRESS
DOI: 10.1016/j.molcel.2014.10.010
关键词
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资金
- Deutsche Forschungsgemeinschaft [PF 202/8-1]
- Excellence Initiative of the German federal government [EXC 294 BIOSS, GSC-4]
- Excellence Initiative of the German state government [EXC 294 BIOSS, GSC-4]
- EMBO long-term fellowship
- [Sonderforschungsbereich 746]
The majority of preproteins destined for mitochondria carry N-terminal presequences. The presequence translocase of the inner mitochondrial membrane (TIM23 complex) plays a central role in protein sorting. Preproteins are either translocated through the TIM23 complex into the matrix or are laterally released into the inner membrane. We report that the small hydrophobic protein Mgr2 controls the lateral release of preproteins. Mgr2 interacts with preproteins in transit through the TIM23 complex. Overexpression of Mgr2 delays preprotein release, whereas a lack of Mgr2 promotes preprotein sorting into the inner membrane. Preproteins with a defective inner membrane sorting signal are translocated into the matrix in wild-type mitochondria but are released into the inner membrane in Mgr2-deficient mitochondria. We conclude that Mgr2 functions as a lateral gatekeeper of the mitochondrial presequence translocase, providing quality control for the membrane sorting of preproteins.
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