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Related Concept Videos

Ligand Binding Sites02:40

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Amino acids03:42

Amino acids

Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...

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Related Experiment Video

Updated: Jun 5, 2026

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

Structural selection of ionic-complementary peptides with electrostatic interactions.

Zhiqiang Yan1, Jun Wang, Jian Zhang

  • 1National Laboratory of Solid State Microstructure and Department of Physics, Nanjing University, Nanjing 210093, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Environmental factors significantly alter peptide structures and assembly. This study reveals key principles governing peptide structural changes, aiding in future peptide design and applications.

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Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions

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Related Experiment Videos

Last Updated: Jun 5, 2026

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

A Tripeptide-Stabilized Nanoemulsion of Oleic Acid
10:42

A Tripeptide-Stabilized Nanoemulsion of Oleic Acid

Published on: February 27, 2019

Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions
06:50

Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions

Published on: January 26, 2024

Area of Science:

  • Biophysics
  • Computational Chemistry
  • Materials Science

Background:

  • Peptide structure and assembly are highly sensitive to environmental conditions.
  • Understanding these environmental modulations is crucial for diverse applications.

Purpose of the Study:

  • To investigate the physical principles behind environmental influences on peptide structures.
  • To explore the thermodynamics and phase behavior of EAK16-family peptides under varying conditions.

Main Methods:

  • Simulations using an intermediate-resolution model.
  • Explicit consideration of backbone hydrogen bonds and electrostatic interactions.
  • Thermodynamic analysis including free energy and heat capacity.

Main Results:

  • Phase diagrams were constructed based on temperature and electrostatic interaction strength.
  • Differences in aggregation behavior were linked to monomeric structural features.
  • Charge pattern identified as the primary determinant of peptide response to environmental changes.

Conclusions:

  • Environmental factors, particularly electrostatic interactions, dictate peptide structure and aggregation.
  • Charge patterns are fundamental to the differential responses observed in EAK16-family peptides.
  • Findings offer insights for peptide system design and analysis.