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Updated: Jun 8, 2026
16:41
A Protocol for Computer-Based Protein Structure and Function Prediction
Published on: November 3, 2011
Self-organizing fuzzy graphs for structure-based comparison of protein pockets
Felix Reisen1, Martin Weisel, Jan M Kriegl
1Computer-Assisted Drug Design, Eidgenössische Technische Hochschule, Zürich, Zürich, Switzerland.
Journal of Proteome Research
|October 2, 2010
Summary
We developed PoLiMorph, a novel algorithm for comparing protein ligand-binding pockets based on their 3D structure. This tool aids in identifying functionally similar proteins and predicting drug interactions, even without sequence similarity.
Area of Science:
- Structural bioinformatics
- Computational drug discovery
- Protein structure analysis
Background:
- Receptor-ligand interactions can be conserved across proteins lacking sequence homology.
- Structural comparison of ligand-binding pockets is crucial for characterizing orphan proteins and predicting ligand promiscuity.
Purpose of the Study:
- To present PoLiMorph, an algorithm for rapid comparison of protein ligand-binding pockets.
- To enable functional characterization of orphan proteins and prediction of ligand promiscuity using structural data.
Main Methods:
- Representing protein pockets as self-organizing graphs with fuzzy property labels.
- Employing a fast heuristic based on the maximum dispersion problem for framework matching.
- Utilizing a scoring function incorporating property distributions and interaction patterns.
Main Results:
- PoLiMorph correctly assigned 81% of 69 distinct structural classes in a virtual screening experiment.
- The algorithm demonstrated sustained ability to group pockets accommodating similar ligand chemotypes.
- A reliable score threshold for "true" pocket similarity was determined.
Conclusions:
- PoLiMorph facilitates structure-based drug design by enabling reliable pocket similarity assessment.
- The algorithm supports sequence-independent studies of protein function and ligand interactions.
- This approach advances the understanding of conserved binding site properties across diverse proteins.
Related Concept Videos
01:24Protein 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.
The primary structure of a protein is its amino acid sequence.
01:13Protein Organization
Overview
02:04Protein-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...
02:04Protein-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...
01:49Conserved 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...
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...
02:26Protein 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,...
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,...