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Related Concept Videos

Protein Networks02:26

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
Protein Networks02:26

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Peptide Bonds02:43

Peptide Bonds

A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
Conserved Binding Sites01:49

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Protein Organization01:24

Protein Organization

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.
The primary structure of a protein is its amino acid sequence.

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Related Experiment Video

Updated: Jun 14, 2026

A Tripeptide-Stabilized Nanoemulsion of Oleic Acid
10:42

A Tripeptide-Stabilized Nanoemulsion of Oleic Acid

Published on: February 27, 2019

Novel DNA-peptide interaction networks.

Jonathan T B Huang1, Yen-Chung Chen, Jung-Cheng Chang

  • 1Department of Chemistry and Life Science Research Center, Tunghai Christian University, Taichung 407, Taiwan, ROC.

Bioorganic & Medicinal Chemistry
|March 27, 2010
PubMed
Summary

New DNA-binding peptides reveal interaction network cooperativity in allostery. These findings suggest a model for allosteric regulation in DNA-peptide interactions, guiding future research.

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Last Updated: Jun 14, 2026

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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

Published on: September 21, 2017

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Allostery, the regulation of protein function by binding at a site distinct from the active site, is crucial in biological systems.
  • Understanding allosteric mechanisms in DNA-peptide interactions is essential for deciphering complex cellular processes.
  • Previous studies suggest interaction network cooperativity plays a significant role in DNA-peptide binding.

Purpose of the Study:

  • To investigate allosteric mechanisms in DNA-peptide interactions using novel synthetic peptides.
  • To explore the role of interaction network cooperativity in DNA-peptide binding.
  • To develop models for understanding allostery in DNA-peptide systems.

Main Methods:

  • Quantitative DNase I footprinting was employed to study the binding of four newly designed peptides to DNA.
  • Peptides containing the XP(Hyp)RK motif and N-methylpyrrole (Py) moieties were synthesized and characterized.
  • Circular dichroism (CD) spectroscopy was used to analyze peptide-oligonucleotide interactions and conformational changes.

Main Results:

  • Apparent binding constants in the micromolar range and Hill coefficients were determined for the synthesized peptides.
  • Results support the hypothesis that interaction network cooperativity is preferred in DNA-peptide interactions with multiple recognition sites.
  • Circular dichroism experiments indicated dimeric binding of some peptides to the DNA minor groove, inducing conformational changes.

Conclusions:

  • DNA allostery is likely mediated by interaction networks, potentially involving interstrand bidentate interactions.
  • The study provides a framework for designing new DNA-binding peptides to investigate allosteric interactions.
  • Insights into DNA-peptide allostery may illuminate fundamental chemical rules governing complex biological processes like DNA-protein interactions.