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Related Concept Videos

Protein Organization01:13

Protein Organization

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Protein and Protein Structure02:15

Protein and Protein Structure

Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
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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.
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Related Experiment Video

Updated: Jul 21, 2026

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
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Published on: April 2, 2015

Stability of G,A triple helices.

A Debin1, C Laboulais, M Ouali

  • 1CNRS UMR 8532, Institut Gustave-Roussy, 94805 Villejuif, France.

Nucleic Acids Research
|June 22, 1999
PubMed
Summary

Researchers identified DNA sequences that form stable triplexes with purine oligonucleotides. These sequences are rich in guanine and form more stable structures when guanines are in stretches, influenced by magnesium ion interactions.

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In Vitro Chemical Mapping of G-Quadruplex DNA Structures by Bis-3-Chloropiperidines
05:32

In Vitro Chemical Mapping of G-Quadruplex DNA Structures by Bis-3-Chloropiperidines

Published on: May 12, 2023

Area of Science:

  • Molecular Biology
  • Biophysics
  • Computational Chemistry

Background:

  • DNA triplexes are crucial for various biological processes and therapeutic applications.
  • Understanding the sequence-stability relationship in DNA triplexes is essential for their design and utilization.
  • Previous studies have explored factors influencing DNA triplex stability, but sequence selection and ion effects require further investigation.

Purpose of the Study:

  • To select double-stranded DNA sequences that form stable triplexes with purine oligonucleotides at different temperatures.
  • To elucidate the sequence rules governing triplex stability.
  • To computationally investigate the role of metal ions in stabilizing DNA triplexes.

Main Methods:

  • A double aptamer selection approach was employed to identify DNA sequences capable of forming stable triplexes.
  • Cold exchange method was used to confirm the stability of selected triplexes.
  • Density scaled Monte Carlo simulations were performed to analyze the ion environment around DNA triplexes.

Main Results:

  • Selected DNA sequences exhibit high guanine (G) content.
  • Triplex stability increases when G residues are arranged in stretches.
  • Computer simulations revealed that magnesium ions (Mg2+) preferentially associate with G residues, forming a stabilizing 'spine', and are repelled by adenine (A) residues.

Conclusions:

  • The study identified specific DNA sequence characteristics that promote stable triplex formation.
  • Guanine-rich sequences, particularly with G-stretches, are favorable for triplex stability.
  • Magnesium ion coordination plays a critical role in stabilizing DNA triplexes, with a specific binding pattern around guanine residues.