関西光科学研究所　|　第45回KPSIセミナー Resolution-exchanged structural modeling and simulations jointly unravel that subunit rolling underlies the mechanism of programmed ribosomal frameshifting

関西光科学研究所 >> KPSIセミナー >> Resolution-exchanged structural modeling and simulations jointly unravel that subunit rolling underlies the mechanism of programmed ribosomal frameshifting

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第45回KPSIセミナー

Resolution-exchanged structural modeling and simulations jointly unravel that subunit rolling underlies the mechanism of programmed ribosomal frameshifting

Resolution-exchanged structural modeling and simulations jointly unravel that subunit rolling underlies the mechanism of programmed ribosomal frameshifting

Prof. Lee-Wei Yang
（台湾国立清華大学 生命情報科学 構造生物学研究所）

概要

Biological regulation is a manifestation of binding-triggered force controls at the molecular levels. Existing theoretical tools can hardly describe such a control at atomistic details for huge molecular machineries that orchestrate a repertoire of functional motions over long time periods. Here, we leverage linear response theories and resolution-exchanged simulations to study the pseudoknot (PK)-induced force control over programmed ribosomal frameshifting (PRF). Connecting and rationalizing existing structural, single-molecule and mutagenesis data by first principles, we demonstrated how steric hindrance of a stable mRNA structure transiently modifies the conformational dynamics of the ribosome, and subsequently allows tRNA to shift one nucleotide backwards during -1 PRF. Our study provides a temporal and spatial description of PRF with unprecedented mechanistic details to conclude that 30S subunit rolling is the motion that mediates the delicate force control of cis-element unwinding over -1 PRF. The introduced method is also instrumental in studying force-induced controls over other supramolecular machineries.

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