Evolution of the ribosome at atomic resolution

Significance Ribosomes exist in every cell and are responsible for translation from mRNA to protein. The structure of the ribosomal common core is highly conserved in all living species, while the outer regions of the ribosome are variable. Ribosomal RNA of eukaryotes contains expansion segments accreted onto the surface of the core, which is nearly identical in structure to that in prokaryotic ribosomes. Comparing eukaryotic and prokaryotic ribosomes allows us to identify 3D insertion fingerprints of the expansion segments. Similar fingerprints allow us to analyze the common core and detect ancestral expansion segments within it. We construct a molecular model of ribosomal evolution starting from primordial biological systems near the dawn of life, culminating with relatively recent changes specific to metazoans. The origins and evolution of the ribosome, 3–4 billion years ago, remain imprinted in the biochemistry of extant life and in the structure of the ribosome. Processes of ribosomal RNA (rRNA) expansion can be “observed” by comparing 3D rRNA structures of bacteria (small), yeast (medium), and metazoans (large). rRNA size correlates well with species complexity. Differences in ribosomes across species reveal that rRNA expansion segments have been added to rRNAs without perturbing the preexisting core. Here we show that rRNA growth occurs by a limited number of processes that include inserting a branch helix onto a preexisting trunk helix and elongation of a helix. rRNA expansions can leave distinctive atomic resolution fingerprints, which we call “insertion fingerprints.” Observation of insertion fingerprints in the ribosomal common core allows identification of probable ancestral expansion segments. Conceptually reversing these expansions allows extrapolation backward in time to generate models of primordial ribosomes. The approach presented here provides insight to the structure of pre-last universal common ancestor rRNAs and the subsequent expansions that shaped the peptidyl transferase center and the conserved core. We infer distinct phases of ribosomal evolution through which ribosomal particles evolve, acquiring coding and translocation, and extending and elaborating the exit tunnel.

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