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Related Concept Videos

RNA Structure01:19

RNA Structure

The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
Transcriptional Regulation: Riboswitches01:23

Transcriptional Regulation: Riboswitches

Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Folding01:22

Protein Folding

Overview

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Nanomanipulation of Single RNA Molecules by Optical Tweezers
06:59

Nanomanipulation of Single RNA Molecules by Optical Tweezers

Published on: August 20, 2014

Folding kinetics for the conformational switch between alternative RNA structures.

Song Cao1, Boris Fürtig, Harald Schwalbe

  • 1Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA.

The Journal of Physical Chemistry. B
|October 5, 2010
PubMed
Summary
This summary is machine-generated.

RNA conformational switching is key to its function. This study uses master equation and kinetic cluster methods to reveal factors governing RNA folding kinetics, including heat capacity and tertiary interactions.

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Area of Science:

  • Biochemistry
  • Chemical Physics
  • Molecular Biology

Background:

  • Conformational switching is fundamental to RNA's catalytic and regulatory roles.
  • These transitions often occur on observable timescales (seconds).
  • Real-time Nuclear Magnetic Resonance (NMR) experiments provide insights into bistable RNA conformation transitions.

Purpose of the Study:

  • To investigate the detailed kinetic mechanism of RNA conformational switching.
  • To identify factors governing RNA folding kinetics.
  • To compare theoretical predictions with experimental data.

Main Methods:

  • Master equation method
  • Kinetic cluster method
  • Theory-experiment comparisons using real-time NMR data.

Main Results:

  • Heat capacity change (ΔC(p)) upon RNA folding is proposed as a significant factor in folding kinetics.
  • Noncanonical tertiary intraloop interactions are crucial for determining folding kinetics in tetraloop hairpins.
  • Different rate models for fundamental steps (base pair/stack formation/disruption) yield contrasting theoretical predictions.

Conclusions:

  • The study elucidates key factors influencing RNA folding kinetics.
  • Understanding these factors is critical for predicting RNA conformational dynamics.
  • Accurate modeling requires careful consideration of fundamental step rate models and tertiary interactions.