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Proteasomal degradation induced by DPP9‐mediated processing competes with mitochondrial protein import
Author(s) -
Finger Yannik,
Habich Markus,
Gerlich Sarah,
Urbanczyk Sophia,
Logt Erik,
Koch Julian,
Schu Laura,
Lapacz Kim Jasmin,
Ali Muna,
Petrungaro Carmelina,
Salscheider Silja Lucia,
Pichlo Christian,
Baumann Ulrich,
Mielenz Dirk,
Dengjel Joern,
Brachvogel Bent,
Hofmann Kay,
Riemer Jan
Publication year - 2020
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.15252/embj.2019103889
Subject(s) - biology , degradation (telecommunications) , microbiology and biotechnology , mitochondrion , protein degradation , biochemistry , telecommunications , computer science
Plasticity of the proteome is critical to adapt to varying conditions. Control of mitochondrial protein import contributes to this plasticity. Here, we identified a pathway that regulates mitochondrial protein import by regulated N‐terminal processing. We demonstrate that dipeptidyl peptidases 8/9 (DPP8/9) mediate the N‐terminal processing of adenylate kinase 2 (AK2) en route to mitochondria. We show that AK2 is a substrate of the mitochondrial disulfide relay, thus lacking an N‐terminal mitochondrial targeting sequence and undergoing comparatively slow import. DPP9‐mediated processing of AK2 induces its rapid proteasomal degradation and prevents cytosolic accumulation of enzymatically active AK2. Besides AK2, we identify more than 100 mitochondrial proteins with putative DPP8/9 recognition sites and demonstrate that DPP8/9 influence the cellular levels of a number of these proteins. Collectively, we provide in this study a conceptual framework on how regulated cytosolic processing controls levels of mitochondrial proteins as well as their dual localization to mitochondria and other compartments.