Abstract
Structural Biology Ribosomes are two-subunit ribonucleoprotein assemblies that catalyze the translation of messenger RNA into protein. Ribosomal RNAs (rRNAs) play key structural and functional roles. Ramrath et al. report the high-resolution structure of mitochondrial ribosomes from the unicellular parasite Trypanosoma brucei that contain the smallest known rRNAs. The trypanosomal mitoribosome is the most complex ribosomal assembly characterized, with two rRNAs and 126 proteins. The increased protein subunits have substituted for rRNA as an architectural scaffold. The structure also reveals the minimal core needed for ribosome function. Science , this issue p. [eaau7735][1] [1]: /lookup/doi/10.1126/science.aau7735
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