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Related Concept Videos

Ligand Binding and Linkage00:49

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
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...
Conserved Binding Sites01:49

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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...
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.
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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...
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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Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
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Published on: October 26, 2015

Hot-spot residues at the E9/Im9 interface help binding via different mechanisms.

Sergio E Wong1, Riccardo Baron, J Andrew McCammon

  • 1Department of Chemistry and Biochemistry, University of California at San Diego, LA Jolla, CA 92093-0365, USA. swong@mccammon.ucsd.edu

Biopolymers
|June 12, 2008
PubMed
Summary

Identifying protein hot spots is key to understanding binding affinity. This study reveals that specific residues like Im9 Ser50 and Glu41 in the Colicin E9/Im9 complex bind differently, offering insights into protein-protein interactions.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • Protein-protein interactions (PPIs) are crucial for cellular functions.
  • Not all interface residues contribute equally to binding affinity.
  • Hot-spot residues significantly impact PPI stability and specificity.

Purpose of the Study:

  • To investigate the binding mechanisms of hot-spot residues in the Colicin E9/Im9 complex.
  • To understand how individual hot spots contribute to overall protein-protein association.
  • To explore the potential for engineering PPIs through hot-spot manipulation.

Main Methods:

  • Utilized alanine scanning experiments to identify key residues affecting binding affinity.
  • Employed molecular dynamics (MD) simulations to analyze the dynamic behavior of the Colicin E9/Im9 complex.
  • Focused on the roles of Im9 Glu41 and Im9 Ser50 as identified hot spots.

Main Results:

  • Confirmed Im9 Glu41 and Im9 Ser50 as critical hot-spot residues.
  • Revealed distinct binding mechanisms for Im9 Glu41 and Im9 Ser50.
  • Demonstrated that Im9 Ser50 influences the conformation of Im9 Glu41 for salt-bridge formation.

Conclusions:

  • Hot-spot residues employ diverse mechanisms to mediate protein-protein binding.
  • The conformational influence of one hot spot on another is a key interaction feature.
  • Understanding these mechanisms can guide the engineering of targeted PPIs and enhance specificity.