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Related Concept Videos

Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Translational Regulation01:29

Translational Regulation

Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
Effects of Temperature on Free Energy02:11

Effects of Temperature on Free Energy

The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:

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Updated: Jun 27, 2026

Comparative RNA Structure Analysis of Nascent and Mature Transcripts in Saccharomyces cerevisiae
09:12

Comparative RNA Structure Analysis of Nascent and Mature Transcripts in Saccharomyces cerevisiae

Published on: February 27, 2026

Periodic Temperature Fluctuations as an Energy Source for RNA Evolution.

Christian Mayer1

  • 1Institute of Physical Chemistry, CENIDE, University of Duisburg-Essen, 45141 Essen, Germany.

Life (Basel, Switzerland)
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

Periodic temperature changes drive RNA evolution by influencing reaction kinetics. This creates a non-equilibrium state, favoring molecular selection and evolution, akin to a Carnot engine.

Keywords:
CarnotRNA worlddriving forceenergy sourceheat enginekineticsmolecular evolutionperiodicitytemperature fluctuationsthermodynamics

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Area of Science:

  • Biochemistry
  • Chemical Kinetics
  • Origin of Life Studies

Background:

  • Early RNA evolution involved short, interacting RNA strands with random base-pairing.
  • Understanding molecular interactions under varying conditions is crucial for evolutionary models.

Purpose of the Study:

  • To investigate the impact of periodic temperature variations on interacting RNA duplexes.
  • To model the kinetics of RNA interactions and their role in early molecular evolution.

Main Methods:

  • Simulated molecular interaction kinetics using experimental thermodynamic data.
  • Applied Eyring theory to model reaction rates under temperature fluctuations.
  • Utilized three competing RNA duplex pairs as simplified model systems.

Main Results:

  • Temperature variations induce shifting reaction kinetics and continuous non-equilibrium.
  • Product mixes formed slowly at low temperatures released energy rapidly at high temperatures, and vice versa.
  • The RNA model system functioned as a generalized Carnot engine, storing and releasing energy.

Conclusions:

  • Periodic temperature changes provide a perpetual driving force for selection processes in early RNA evolution.
  • The model system demonstrates conditions ideal for ongoing molecular evolution.
  • Non-equilibrium thermodynamics are key to understanding early life's chemical processes.