The Giardia lamblia ribosome structure reveals divergence in several biological pathways and the mode of emetine function.
Structure
; 32(4): 400-410.e4, 2024 Apr 04.
Article
in En
| MEDLINE
| ID: mdl-38242118
ABSTRACT
Giardia lamblia is a deeply branching protist and a human pathogen. Its unusual biology presents the opportunity to explore conserved and fundamental molecular mechanisms. We determined the structure of the G. lamblia 80S ribosome bound to tRNA, mRNA, and the antibiotic emetine by cryo-electron microscopy, to an overall resolution of 2.49 Å. The structure reveals rapidly evolving protein and nucleotide regions, differences in the peptide exit tunnel, and likely altered ribosome quality control pathways. Examination of translation initiation factor binding sites suggests these interactions are conserved despite a divergent initiation mechanism. Highlighting the potential of G. lamblia to resolve conserved biological principles; our structure reveals the interactions of the translation inhibitor emetine with the ribosome and mRNA, thus providing insight into the mechanism of action for this widely used antibiotic. Our work defines key questions in G. lamblia and motivates future experiments to explore the diversity of eukaryotic gene regulation.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Giardia lamblia
Limits:
Humans
Language:
En
Journal:
Structure
Journal subject:
BIOLOGIA MOLECULAR
/
BIOQUIMICA
/
BIOTECNOLOGIA
Year:
2024
Document type:
Article
Affiliation country:
Estados Unidos