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Related Concept Videos

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

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...
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:
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:
Constraints and Statical Determinacy01:26

Constraints and Statical Determinacy

In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
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...

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Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules
10:58

Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules

Published on: July 25, 2013

Limiting assumptions in structure-based design: binding entropy.

Garland R Marshall1

  • 1Department of Biochemistry and Molecular Biophysics, Washington University, St. Louis, MO, USA. garlandm@gmail.com

Journal of Computer-Aided Molecular Design
|January 4, 2012
PubMed
Summary
This summary is machine-generated.

Ligand binding entropy in biological systems is complex. New data on HIV-1 protease shows that different ligands can significantly influence binding entropy, challenging previous assumptions in macromolecular studies.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Biological systems' complexity at the atomic level often necessitates simplifying assumptions.
  • A common assumption is that macromolecule binding entropy is ligand-independent.
  • This assumption simplifies thermodynamic analyses of molecular interactions.

Purpose of the Study:

  • To investigate the validity of the assumption that ligand binding entropy is independent of the ligand.
  • To analyze recent experimental data concerning ligands binding to HIV-1 protease.
  • To challenge the conventional understanding of macromolecular binding thermodynamics.

Main Methods:

  • Analysis of experimental data on ligand interactions with HIV-1 protease.
  • Thermodynamic analysis of binding events.
  • Comparison of binding entropy contributions across different ligands.

Main Results:

  • Experimental data on HIV-1 protease demonstrates significant variation in binding entropy based on the specific ligand.
  • The entropy of binding is demonstrably influenced by the chemical and structural properties of the interacting ligands.
  • This finding contradicts the widely held assumption of ligand-independent binding entropy.

Conclusions:

  • The assumption of ligand-independent binding entropy is not universally applicable, particularly in complex systems like HIV-1 protease.
  • Accurate modeling of biological systems requires considering ligand-specific contributions to binding thermodynamics.
  • Future research should incorporate these ligand-dependent entropic effects for more precise molecular interaction studies.