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TitleApicomplexan mitoribosome from highly fragmented rRNAs to a functional machine.
Journal, issue, pagesNat Commun, Vol. 15, Issue 1, Page 10689, Year 2024
Publish dateDec 17, 2024
AuthorsChaoyue Wang / Sari Kassem / Rafael Eduardo Oliveira Rocha / Pei Sun / Tan-Trung Nguyen / Joachim Kloehn / Xianyong Liu / Lorenzo Brusini / Alessandro Bonavoglia / Sramona Barua / Fanny Boissier / Mayara Lucia Del Cistia / Hongjuan Peng / Xinming Tang / Fujie Xie / Zixuan Wang / Oscar Vadas / Xun Suo / Yaser Hashem / Dominique Soldati-Favre / Yonggen Jia /
PubMed AbstractThe phylum Apicomplexa comprises eukaryotic parasites that cause fatal diseases affecting millions of people and animals worldwide. Their mitochondrial genomes have been significantly reduced, ...The phylum Apicomplexa comprises eukaryotic parasites that cause fatal diseases affecting millions of people and animals worldwide. Their mitochondrial genomes have been significantly reduced, leaving only three protein-coding genes and highly fragmented mitoribosomal rRNAs, raising challenging questions about mitoribosome composition, assembly and structure. Our study reveals how Toxoplasma gondii assembles over 40 mt-rRNA fragments using exclusively nuclear-encoded mitoribosomal proteins and three lineage-specific families of RNA-binding proteins. Among these are four proteins from the Apetala2/Ethylene Response Factor (AP2/ERF) family, originally known as transcription factors in plants and Apicomplexa, now repurposed as essential mitoribosome components. Cryo-EM analysis of the mitoribosome structure demonstrates how these AP2 proteins function as RNA binders to maintain mitoribosome integrity. The mitoribosome is also decorated with members of lineage-specific RNA-binding proteins belonging to RAP (RNA-binding domain abundant in Apicomplexa) proteins and HPR (heptatricopeptide repeat) families, highlighting the unique adaptations of these parasites. Solving the molecular puzzle of apicomplexan mitoribosome could inform the development of therapeutic strategies targeting organellar translation.
External linksNat Commun / PubMed:39690155 / PubMed Central
MethodsEM (single particle)
Resolution2.89 - 3.6 Å
Structure data

50448

9fi8

EMDB-50448, PDB-9fi8:
SSU(head) structure derived from the SSU sample of the mitoribosome from T. gondii.
Method: EM (single particle) / Resolution: 3.6 Å

50470

9fia

EMDB-50470, PDB-9fia:
SSU(body) structure derived from the SSU sample of the mitoribosome from T. gondii.
Method: EM (single particle) / Resolution: 3.29 Å

EMDB-50493: LSU structure derived from the monosome sample of the mitoribosome from T. gondii.
Method: EM (single particle) / Resolution: 3.11 Å

51104

9g6k

EMDB-51104, PDB-9g6k:
LSU structure derived from the LSU sample of the mitoribosome from T. gondii.
Method: EM (single particle) / Resolution: 2.89 Å

Source
  • toxoplasma gondii (eukaryote)
KeywordsRIBOSOME / Complex / translation / rRNA

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