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Protein-protein Interfaces

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 Interfaces

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 Networks

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...

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...

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...

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.

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InterProSurf: a web server for predicting interacting sites on protein surfaces.

Surendra S Negi¹, Catherine H Schein, Numan Oezguen

¹Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555-0857, USA.

Bioinformatics (Oxford, England)

|October 16, 2007

Summary

InterProSurf predicts protein-protein interaction sites using 3D structures. This computational method accurately identifies key amino acid residues involved in binding, aiding in understanding protein complex functions.

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Area of Science:

Computational biology
Structural biology
Bioinformatics

Background:

Protein-protein interactions are crucial for cellular functions.
Identifying interaction sites is key to understanding protein complex mechanisms.
The InterProSurf web server provides a novel tool for predicting these sites.

Purpose of the Study:

To introduce InterProSurf, a web server for predicting protein-protein interaction sites.
To demonstrate the utility of InterProSurf in analyzing known protein-receptor interactions.

Main Methods:

Utilizes solvent accessible surface area of residues in isolated protein subunits.
Employs a propensity scale for interface residues.
Applies a clustering algorithm to identify surface regions with high interface propensities.

Main Results:

InterProSurf successfully predicted interacting residues for Bacillus anthracis toxins and measles virus hemagglutinin.
The predicted interface regions showed significant overlap with experimentally determined regions.
This validates the computational approach for identifying protein interaction sites.

Conclusions:

InterProSurf is an effective tool for predicting protein-protein interaction sites.
The server aids in understanding the molecular basis of protein complex formation and function.
It offers a valuable resource for researchers in structural biology and drug discovery.