ADENOSINE-5'-TRIPHOSPHATE / FLAVIN-ADENINE DINUCLEOTIDE / GUANOSINE-5'-DIPHOSPHATE / PHOSPHATE ION / URIDINE 5'-TRIPHOSPHATE / : / RNA / RNA (> 10) / RNA (> 100) / A-kinase anchor protein 7-like phosphoesterase domain-containing protein ...ADENOSINE-5'-TRIPHOSPHATE / FLAVIN-ADENINE DINUCLEOTIDE / GUANOSINE-5'-DIPHOSPHATE / PHOSPHATE ION / URIDINE 5'-TRIPHOSPHATE / : / RNA / RNA (> 10) / RNA (> 100) / A-kinase anchor protein 7-like phosphoesterase domain-containing protein / DNA photolyase, putative / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / Enoyl-CoA hydratase/isomerase domain-containing protein / Uncharacterized protein / Uncharacterized protein / Mitochondrial SSU ribosomal protein / Mitochondrial SSU ribosomal protein / Uncharacterized protein / Probable Zinc-ribbon domain-containing protein / 30S ribosomal protein S8, putative / Uncharacterized protein / Small ribosomal subunit protein mS41 / Uncharacterized protein / Uncharacterized protein / Mitochondrial ribosomal protein S18 / Small ribosomal subunit protein uS5 C-terminal domain-containing protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / Trans-sialidase / [acyl-carrier-protein] S-malonyltransferase / Uncharacterized protein / 30S Ribosomal protein S17, putative / Uncharacterized protein / Target SNARE / Uncharacterized protein / Opioid growth factor receptor (OGFr) conserved domain-containing protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / Pentacotripeptide-repeat region of PRORP domain-containing protein / Uncharacterized protein / Uncharacterized protein / Ribosomal protein S9 / Translation initiation factor IF-2, chloroplastic / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / Trichohyalin / Uncharacterized protein / LysM domain-containing protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / Pentacotripeptide-repeat region of PRORP domain-containing protein / Ubiquitin-like domain-containing protein / Uncharacterized protein / Manganese/iron superoxide dismutase C-terminal domain-containing protein / Superoxide dismutase, putative / Rhodanese domain-containing protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein Similarity search - Component
Biological species
Trypanosoma brucei brucei (eukaryote)
Method
ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å
Journal: Proc Natl Acad Sci U S A / Year: 2022 Title: Mitoribosomal small subunit maturation involves formation of initiation-like complexes. Authors: Tea Lenarčič / Moritz Niemann / David J F Ramrath / Salvatore Calderaro / Timo Flügel / Martin Saurer / Marc Leibundgut / Daniel Boehringer / Céline Prange / Elke K Horn / André Schneider / Nenad Ban / Abstract: Mitochondrial ribosomes (mitoribosomes) play a central role in synthesizing mitochondrial inner membrane proteins responsible for oxidative phosphorylation. Although mitoribosomes from different ...Mitochondrial ribosomes (mitoribosomes) play a central role in synthesizing mitochondrial inner membrane proteins responsible for oxidative phosphorylation. Although mitoribosomes from different organisms exhibit considerable structural variations, recent insights into mitoribosome assembly suggest that mitoribosome maturation follows common principles and involves a number of conserved assembly factors. To investigate the steps involved in the assembly of the mitoribosomal small subunit (mt-SSU) we determined the cryoelectron microscopy structures of middle and late assembly intermediates of the mitochondrial small subunit (mt-SSU) at 3.6- and 3.7-Å resolution, respectively. We identified five additional assembly factors that together with the mitochondrial initiation factor 2 (mt-IF-2) specifically interact with functionally important regions of the rRNA, including the decoding center, thereby preventing premature mRNA or large subunit binding. Structural comparison of assembly intermediates with mature mt-SSU combined with RNAi experiments suggests a noncanonical role of mt-IF-2 and a stepwise assembly process, where modular exchange of ribosomal proteins and assembly factors together with mt-IF-2 ensure proper 9S rRNA folding and protein maturation during the final steps of assembly.
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