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Yeast ribosomal protein L10 (E. coli L16) is located at the center of a topological nexus that connects many functional regions of the large subunit. This essential protein has previously been implicated in processes as diverse as ribosome biogenesis, translational fidelity and mRNA stability. Here, the inability to maintain the yeast Killer virus was used as a proxy for large subunit defects to identify a series of L10 mutants. These mapped to roughly four discrete regions of the protein. A detailed analysis of mutants located in the N-terminal 'hook' of L10, which inserts into the bulge of 25S rRNA helix 89, revealed strong effects on rRNA structure corresponding to the entire path taken by the tRNA 3' end as it moves through the large subunit during the elongation cycle. The mutant-induced structural changes are wide-ranging, affecting ribosome biogenesis, elongation factor binding, drug resistance/hypersensitivity, translational fidelity and virus maintenance. The importance of L10 as a potential transducer of information through the ribosome, and of a possible role of its N-terminal domain in switching between the pre- and post-translocational states are discussed.

Yeast ribosomal protein L10 helps coordinate tRNA movement through the large subunit