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Related Concept Videos

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...
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,...
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,...
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.
The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:

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Related Experiment Video

Updated: Jun 3, 2026

Determination of the Gas-phase Acidities of Oligopeptides
11:00

Determination of the Gas-phase Acidities of Oligopeptides

Published on: June 24, 2013

Protein-cation interactions: structural and thermodynamic aspects.

X Arias-Moreno1, O Abian, S Vega

  • 1Institute of Biocomputation and Physics of Complex Systems, Universidad de Zaragoza, Zaragoza, Spain.

Current Protein & Peptide Science
|March 16, 2011
PubMed
Summary
This summary is machine-generated.

Cations act as allosteric effectors, significantly altering protein structure and function. Proteins can specifically bind and differentiate between cations like calcium and magnesium, modulating their biological interactions.

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Last Updated: Jun 3, 2026

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Published on: June 24, 2013

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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
07:33

Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry

Published on: October 15, 2018

Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Cations are crucial for protein structure and function, acting as stabilizers or activators.
  • Cation binding induces significant conformational changes, influencing protein folding and oligomerization.
  • Proteins exhibit remarkable specificity in discriminating between similar cations, such as calcium and magnesium.

Purpose of the Study:

  • To summarize recent findings on the structural and energetic impact of cation binding to proteins.
  • To explore the role of cations as allosteric effectors modulating protein function.
  • To highlight the mechanisms by which proteins recognize and respond to different cations.

Main Methods:

  • Review of recent structural and biophysical studies on cation-protein interactions.
  • Analysis of conformational changes and energetic effects induced by cation binding.
  • Comparative analysis of cation-binding specificity and affinity.

Main Results:

  • Cation binding can induce substantial protein conformational changes, including complete folding.
  • Proteins differentiate between cations like calcium and magnesium, leading to distinct binding affinities and functional outcomes.
  • Cations act as allosteric effectors, altering protein conformational equilibrium and target interaction capabilities.

Conclusions:

  • Cations are versatile allosteric effectors that significantly modulate protein properties.
  • The specific recognition and differential binding of cations are key to their functional roles.
  • Understanding cation-protein interactions provides insights into protein regulation and function.