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Ligand Binding Sites

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...

Ligand Binding Sites

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...

Protein Organization

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.

Ligand Binding and Linkage

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...

The Equilibrium Binding Constant and Binding Strength

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:

Conserved Binding Sites

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...

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Related Experiment Video

Updated: May 27, 2026

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

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

Published on: October 15, 2018

PSCDB: a database for protein structural change upon ligand binding.

Takayuki Amemiya¹, Ryotaro Koike, Akinori Kidera

¹Graduate School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.

Nucleic Acids Research

|November 15, 2011

Summary

This summary is machine-generated.

Researchers created the Protein Structural Change DataBase (PSCDB) to classify protein structural changes related to ligand binding. This database categorizes motions, aiding the study of protein flexibility and function.

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Last Updated: May 27, 2026

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

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

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

Published on: July 25, 2013

Area of Science:

Biochemistry
Structural Biology
Bioinformatics

Background:

Proteins are dynamic molecules essential for biological functions, exhibiting flexibility and undergoing conformational changes.
The Protein Data Bank (PDB) offers structural data for proteins under various conditions, including ligand-bound and ligand-free states, crucial for understanding functional mechanisms.

Purpose of the Study:

To construct a comprehensive database (PSCDB) cataloging protein structural changes.
To classify and analyze protein structural motions in relation to ligand binding events.
To provide a resource for visualizing and studying protein conformational dynamics.

Main Methods:

Collected 839 protein structural pairs comparing ligand-free and ligand-bound states from monomeric or homo-dimeric proteins.
Developed classification schemes to categorize observed protein structural changes based on motion coupling with ligand binding.
Implemented a database structure to store and present detailed information on protein motions, including animations.

Main Results:

Established the Protein Structural Change DataBase (PSCDB) with 839 structural pairs.
Classified protein structural changes into seven distinct categories: coupled domain motion, independent domain motion, coupled local motion, independent local motion, burying ligand motion, no significant motion, and other type motion.
Detailed counts for each motion class were provided, highlighting the prevalence of different types of structural rearrangements.

Conclusions:

The PSCDB facilitates the study of structure-function relationships by providing a categorized resource of protein conformational changes.
Understanding the coupling between ligand binding and protein motion is key to deciphering protein function.
The database serves as a valuable tool for researchers investigating protein dynamics and molecular recognition.