Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 132, Issue 38, Pages 13170-13171Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja1061399
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Funding
- LANL LDRD
- NIH [R01-GM072686]
- NSF [PHY-0822283]
- [NSF-MCB-0543906]
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Using explicit-solvent simulations of the 70S ribosome, the barrier-crossing attempt frequency was calculated for aminoacyl-tRNA elbow-accommodation. In seven individual trajectories (200-300 ns, each, for an aggregate time of 2.1 mu s), the relaxation time of tRNA structural fluctuations was determined to be similar to 10 ns, and the barrier-crossing attempt frequency of tRNA accommodation is similar to 1-10 mu s(-1). These calculations provide a quantitative relationship between the free-energy barrier and experimentally measured rates of accommodation, which demonstrate that the free-energy barrier of elbow-accommodation is less than 15 k(B) T, in vitro and in vivo.
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