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High-resolution imaging reveals compartmentalization of mitochondrial protein synthesis in cultured human cells
Human mitochondria contain their own genome, mitochondrial DNA, that is expressed in the mitochondrial matrix. This genome encodes 13 vital polypeptides that are components of the multisubunit complexes that couple oxidative phosphorylation (OXPHOS). The inner mitochondrial membrane that houses thes...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
National Academy of Sciences
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8017971/ https://www.ncbi.nlm.nih.gov/pubmed/33526660 http://dx.doi.org/10.1073/pnas.2008778118 |
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author | Zorkau, Matthew Albus, Christin A. Berlinguer-Palmini, Rolando Chrzanowska-Lightowlers, Zofia M. A. Lightowlers, Robert N. |
author_facet | Zorkau, Matthew Albus, Christin A. Berlinguer-Palmini, Rolando Chrzanowska-Lightowlers, Zofia M. A. Lightowlers, Robert N. |
author_sort | Zorkau, Matthew |
collection | PubMed |
description | Human mitochondria contain their own genome, mitochondrial DNA, that is expressed in the mitochondrial matrix. This genome encodes 13 vital polypeptides that are components of the multisubunit complexes that couple oxidative phosphorylation (OXPHOS). The inner mitochondrial membrane that houses these complexes comprises the inner boundary membrane that runs parallel to the outer membrane, infoldings that form the cristae membranes, and the cristae junctions that separate the two. It is in these cristae membranes that the OXPHOS complexes have been shown to reside in various species. The majority of the OXPHOS subunits are nuclear-encoded and must therefore be imported from the cytosol through the outer membrane at contact sites with the inner boundary membrane. As the mitochondrially encoded components are also integral members of these complexes, where does protein synthesis occur? As transcription, mRNA processing, maturation, and at least part of the mitoribosome assembly process occur at the nucleoid and the spatially juxtaposed mitochondrial RNA granules, is protein synthesis also performed at the RNA granules close to these entities, or does it occur distal to these sites? We have adapted a click chemistry-based method coupled with stimulated emission depletion nanoscopy to address these questions. We report that, in human cells in culture, within the limits of our methodology, the majority of mitochondrial protein synthesis is detected at the cristae membranes and is spatially separated from the sites of RNA processing and maturation. |
format | Online Article Text |
id | pubmed-8017971 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | National Academy of Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-80179712021-04-12 High-resolution imaging reveals compartmentalization of mitochondrial protein synthesis in cultured human cells Zorkau, Matthew Albus, Christin A. Berlinguer-Palmini, Rolando Chrzanowska-Lightowlers, Zofia M. A. Lightowlers, Robert N. Proc Natl Acad Sci U S A Biological Sciences Human mitochondria contain their own genome, mitochondrial DNA, that is expressed in the mitochondrial matrix. This genome encodes 13 vital polypeptides that are components of the multisubunit complexes that couple oxidative phosphorylation (OXPHOS). The inner mitochondrial membrane that houses these complexes comprises the inner boundary membrane that runs parallel to the outer membrane, infoldings that form the cristae membranes, and the cristae junctions that separate the two. It is in these cristae membranes that the OXPHOS complexes have been shown to reside in various species. The majority of the OXPHOS subunits are nuclear-encoded and must therefore be imported from the cytosol through the outer membrane at contact sites with the inner boundary membrane. As the mitochondrially encoded components are also integral members of these complexes, where does protein synthesis occur? As transcription, mRNA processing, maturation, and at least part of the mitoribosome assembly process occur at the nucleoid and the spatially juxtaposed mitochondrial RNA granules, is protein synthesis also performed at the RNA granules close to these entities, or does it occur distal to these sites? We have adapted a click chemistry-based method coupled with stimulated emission depletion nanoscopy to address these questions. We report that, in human cells in culture, within the limits of our methodology, the majority of mitochondrial protein synthesis is detected at the cristae membranes and is spatially separated from the sites of RNA processing and maturation. National Academy of Sciences 2021-02-09 2021-02-01 /pmc/articles/PMC8017971/ /pubmed/33526660 http://dx.doi.org/10.1073/pnas.2008778118 Text en Copyright © 2021 the Author(s). Published by PNAS. http://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY) (http://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Biological Sciences Zorkau, Matthew Albus, Christin A. Berlinguer-Palmini, Rolando Chrzanowska-Lightowlers, Zofia M. A. Lightowlers, Robert N. High-resolution imaging reveals compartmentalization of mitochondrial protein synthesis in cultured human cells |
title | High-resolution imaging reveals compartmentalization of mitochondrial protein synthesis in cultured human cells |
title_full | High-resolution imaging reveals compartmentalization of mitochondrial protein synthesis in cultured human cells |
title_fullStr | High-resolution imaging reveals compartmentalization of mitochondrial protein synthesis in cultured human cells |
title_full_unstemmed | High-resolution imaging reveals compartmentalization of mitochondrial protein synthesis in cultured human cells |
title_short | High-resolution imaging reveals compartmentalization of mitochondrial protein synthesis in cultured human cells |
title_sort | high-resolution imaging reveals compartmentalization of mitochondrial protein synthesis in cultured human cells |
topic | Biological Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8017971/ https://www.ncbi.nlm.nih.gov/pubmed/33526660 http://dx.doi.org/10.1073/pnas.2008778118 |
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