Publication Date:
2013-12-24
Description:
Mitochondrial ribosomes synthesize a number of highly hydrophobic proteins encoded on the genome of mitochondria, the organelles in eukaryotic cells that are responsible for energy conversion by oxidative phosphorylation. The ribosomes in mammalian mitochondria have undergone massive structural changes throughout their evolution, including ribosomal RNA shortening and acquisition of mitochondria-specific ribosomal proteins. Here we present the three-dimensional structure of the 39S large subunit of the porcine mitochondrial ribosome determined by cryo-electron microscopy at 4.9 A resolution. The structure, combined with data from chemical crosslinking and mass spectrometry experiments, reveals the unique features of the 39S subunit at near-atomic resolution and provides detailed insight into the architecture of the polypeptide exit site. This region of the mitochondrial ribosome has been considerably remodelled compared to its bacterial counterpart, providing a specialized platform for the synthesis and membrane insertion of the highly hydrophobic protein components of the respiratory chain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Greber, Basil J -- Boehringer, Daniel -- Leitner, Alexander -- Bieri, Philipp -- Voigts-Hoffmann, Felix -- Erzberger, Jan P -- Leibundgut, Marc -- Aebersold, Ruedi -- Ban, Nenad -- England -- Nature. 2014 Jan 23;505(7484):515-9. doi: 10.1038/nature12890. Epub 2013 Dec 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Department of Biology, Institute of Molecular Biology and Biophysics, Schafmattstrasse 20, ETH Zurich, CH-8093 Zurich, Switzerland [2]. ; Department of Biology, Institute of Molecular Systems Biology, Wolfgang-Pauli-Strasse 16, ETH Zurich, CH-8093 Zurich, Switzerland. ; Department of Biology, Institute of Molecular Biology and Biophysics, Schafmattstrasse 20, ETH Zurich, CH-8093 Zurich, Switzerland. ; 1] Department of Biology, Institute of Molecular Systems Biology, Wolfgang-Pauli-Strasse 16, ETH Zurich, CH-8093 Zurich, Switzerland [2] Faculty of Science, University of Zurich, CH-8057 Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24362565" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Cattle
;
Cryoelectron Microscopy
;
Hydrophobic and Hydrophilic Interactions
;
Mass Spectrometry
;
Mitochondria/*chemistry/ultrastructure
;
Mitochondrial Proteins/chemistry/ultrastructure
;
Models, Molecular
;
Nucleic Acid Conformation
;
Protein Conformation
;
RNA, Ribosomal, 16S/chemistry/ultrastructure
;
Ribosomal Proteins/chemistry/ultrastructure
;
Ribosome Subunits/*chemistry/ultrastructure
;
Swine
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
