The minimal twister sister (TS)-like self-cleaving ribozymes, revealed by deep mutational scanning, represent some of the very few human/primate ribozymes.
A high-throughput analysis of several self-cleaving ribozymes reveals the effect of every possible mutation, and every possible pair of mutations, and how patterns in the relative activity data can be mapped to canonical and non-canonical structural elements.
James Attwater, Aditya Raguram ... Philipp Holliger
Adopting RNA trinucleotides as substrates, ribozymes can catalyse the copying of structured RNA sequences, allowing self-synthesis by part of a newly evolved symbiotic ribozyme pair.
High-resolution maps and models of the bacterial ribosome provide new chemical insights into protein synthesis, and should enable the development of robust tools for cryo-EM structure modeling and refinement.
Xiao-chen Bai, Israel S Fernandez ... Sjors HW Scheres
A combination of direct-electron detectors and statistical movie processing allows ribosome cryo-EM structures to be determined to resolutions that were previously only attainable by X-ray crystallography.
The size of the mRNA fragment protected by a ribosome depends on the ribosome's conformation, which enables studies of the distinct steps of decoding and translocation at single-codon resolution.
Cryo-electron microscopy has been used to provide a structural interpretation of the complete action cycle of release factor 3 during translation termination, which includes a coordinated sequence of interactions with a class-I release factor and the ribosome.
Blake W Tye, Nicoletta Commins ... L Stirling Churchman
Rapidly proliferating cells are at risk of compromised cell fitness due to proteostasis collapse from perturbations that interfere with ribosome biogenesis.
Benjamin Albert, Isabelle C Kos-Braun ... David Shore
Ribosome assembly is monitored to promote proteostatis through a system whereby unassembled ribosomal proteins lead to activation of heat shock factor 1 and inactivation of the RP gene activator Ifh1.