Article ; Online: The multi-factor modulated biogenesis of the mitochondrial multi-span protein Om14.
2022 Volume 221, Issue 4
Abstract: The mitochondrial outer membrane (MOM) harbors proteins that traverse the membrane via several helical segments and are called multi-span proteins. To obtain new insights into the biogenesis of these proteins, we utilized yeast mitochondria and the multi- ...
Abstract | The mitochondrial outer membrane (MOM) harbors proteins that traverse the membrane via several helical segments and are called multi-span proteins. To obtain new insights into the biogenesis of these proteins, we utilized yeast mitochondria and the multi-span protein Om14. Testing different truncation variants, we show that while only the full-length protein contains all the information that assures perfect targeting specificity, shorter variants are targeted to mitochondria with compromised fidelity. Employing a specific insertion assay and various deletion strains, we show that proteins exposed to the cytosol do not contribute significantly to the biogenesis process. We further demonstrate that Mim1 and Porin support optimal membrane integration of Om14 but none of them are absolutely required. Unfolding of newly synthesized Om14, its optimal hydrophobicity, and higher fluidity of the membrane enhanced the import capacity of Om14. Collectively, these findings suggest that MOM multi-span proteins follow different biogenesis pathways in which proteinaceous elements and membrane behavior contribute to a variable extent to the combined efficiency. |
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MeSH term(s) | Mitochondrial Membrane Transport Proteins/metabolism ; Mitochondrial Membranes/metabolism ; Protein Transport ; Saccharomyces cerevisiae/genetics ; Saccharomyces cerevisiae/metabolism ; Saccharomyces cerevisiae Proteins/genetics ; Saccharomyces cerevisiae Proteins/metabolism |
Chemical Substances | MIM1 protein, S cerevisiae ; Mitochondrial Membrane Transport Proteins ; OM14 protein, S cerevisiae ; Saccharomyces cerevisiae Proteins |
Language | English |
Publishing date | 2022-03-09 |
Publishing country | United States |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 218154-x |
ISSN | 1540-8140 ; 0021-9525 |
ISSN (online) | 1540-8140 |
ISSN | 0021-9525 |
DOI | 10.1083/jcb.202112030 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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