Trade-Offs between Speed, Accuracy, and Dissipation in tRNA^Ile Aminoacylation.

ABSTRACT: Living systems maintain a high fidelity in information processing through kinetic proofreading, a mechanism for preferentially removing incorrect substrates at the cost of energy dissipation and slower speed. Proofreading mechanisms must balance their demand for higher speed, fewer errors, and lower dissipation, but it is unclear how rates of individual reaction steps are evolutionarily tuned to balance these needs, especially when multiple proofreading mechanisms are present. Here, using a discrete-state stochastic model, we analyze the optimization strategies in Escherichia coli isoleucyl-tRNA synthetase. Surprisingly, this enzyme adopts an economic proofreading strategy and improves speed and dissipation as long as the error is tolerable. Through global parameter sampling, we rev

SUBMITTER: Yu Q 

PROVIDER: S-EPMC7890467 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature