Kinetic modeling predicts a stimulatory role for ribosome collisions at elongation stall sites in bacteria

ELife
Michael A Ferrin, Arvind R Subramaniam

Abstract

Ribosome stalling on mRNAs can decrease protein expression. To decipher ribosome kinetics at stall sites, we induced ribosome stalling at specific codons by starving the bacteriumEscherichia colifor the cognate amino acid. We measured protein synthesis rates from a reporter library of over 100 variants that encoded systematic perturbations of translation initiation rate, the number of stall sites, and the distance between stall sites. Our measurements are quantitatively inconsistent with two widely-used kinetic models for stalled ribosomes: ribosome traffic jams that block initiation, and abortive (premature) termination of stalled ribosomes. Rather, our measurements support a model in which collision with a trailing ribosome causes abortive termination of the stalled ribosome. In our computational analysis, ribosome collisions selectively stimulate abortive termination without fine-tuning of kinetic rate parameters at ribosome stall sites. We propose that ribosome collisions serve as a robust timer for translational quality control pathways to recognize stalled ribosomes.

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Citations

Jul 25, 2018·Cold Spring Harbor Perspectives in Biology·Nicholas T IngoliaJonathan S Weissman
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Methods Mentioned

BETA
protein folding
PCR
fluorescence imager
aminoacylation

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