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J Cell Sci. 2018 May 16;131(10). pii: jcs211110. doi: 10.1242/jcs.211110.

The GET pathway can increase the risk of mitochondrial outer membrane proteins to be mistargeted to the ER.

Author information

1
Interfaculty Institute of Biochemistry, University of Tübingen, 72076 Tübingen, Germany.
2
Centre for Plant Molecular Biology, Developmental Genetics, University of Tübingen, Tübingen 72076, Germany.
3
Consiglio Nazionale delle Ricerche Institute of Neuroscience, Milan 20100, Italy.
4
Department of Molecular Biology, Universitätsmedizin Göttingen, Göttingen 37073, Germany.
5
Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel.
6
Interfaculty Institute of Biochemistry, University of Tübingen, 72076 Tübingen, Germany doron.rapaport@uni-tuebingen.de.

Abstract

Tail-anchored (TA) proteins are anchored to their corresponding membrane via a single transmembrane segment (TMS) at their C-terminus. In yeast, the targeting of TA proteins to the endoplasmic reticulum (ER) can be mediated by the guided entry of TA proteins (GET) pathway, whereas it is not yet clear how mitochondrial TA proteins are targeted to their destination. It has been widely observed that some mitochondrial outer membrane (MOM) proteins are mistargeted to the ER when overexpressed or when their targeting signal is masked. However, the mechanism of this erroneous sorting is currently unknown. In this study, we demonstrate the involvement of the GET machinery in the mistargeting of suboptimal MOM proteins to the ER. These findings suggest that the GET machinery can, in principle, recognize and guide mitochondrial and non-canonical TA proteins. Hence, under normal conditions, an active mitochondrial targeting pathway must exist that dominates the kinetic competition against other pathways.

KEYWORDS:

ER; GET; Mitochondria; Outer membrane; Protein sorting; Tail-anchor

PMID:
29661846
DOI:
10.1242/jcs.211110

Conflict of interest statement

Competing interestsThe authors declare no competing or financial interests.

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