Translational and rotational diffusion of short ribonucleic acids

Area of Science:

• Molecular Biology
• Biophysics

Background:

• Diffusion is essential for ribonucleic acids (RNAs) to regulate gene expression and perform gene editing.
• Understanding RNA diffusion dynamics is key to elucidating their biological functions.

Purpose of the Study:

• To develop empirical models for predicting the translational and rotational diffusion coefficients of short ribonucleic acids.
• To establish a relationship between polymer size (N) and diffusion rates.

Main Methods:

• Utilized an empirical model to predict translational diffusion (D) based on RNA length (N).
• Derived a new empirical model (Dr) for rotational diffusion using atom-level shell-modeling of electron density maps.

Main Results:

• The translational diffusion model, D = 4.58 x 10^-10 * N^-0.39 m^2s^-1, accurately predicts diffusion for RNAs up to 200 nucleotides.
• The derived rotational diffusion model, Dr = 1.62 x 10^9 * N^-1.20 s^-1, predicts rotational diffusion coefficients based on polymer size.

Conclusions:

• Accurate prediction of RNA diffusion is achievable using empirical models based on polymer size.
• These models provide valuable insights into RNA dynamics, impacting gene regulation and editing research.