Discovering amino acid patterns on binding sites in protein complexes
Bioinformation
|April 6, 2011
Summary
This study reveals amino acid patterns on protein binding sites using a novel circular grid and association rule mining. These patterns improve protein-protein interaction prediction accuracy, identifying frequent residues like arginine.
Area of Science:
- Bioinformatics
- Computational Biology
- Structural Biology
Background:
- Identifying amino acid (AA) patterns on protein binding sites is crucial for understanding protein-protein interactions.
- Existing methods may not fully capture the spatial relationships of AAs within binding sites.
- Predicting protein-protein interactions is vital in numerous biological processes.
Purpose of the Study:
- To develop a method for discovering association rules among amino acids on protein binding sites.
- To improve the accuracy of predicting protein-protein interactions by analyzing binding site characteristics.
- To provide novel insights into the spatial arrangements of amino acids in protein recognition complexes.
Main Methods:
- Association rule mining applied to geographically partitioned amino acids on protein binding sites.
- Projection of 3D binding site structures to 2D and placement onto a circular grid with 10 rings and variable sectors.
- Data mining of 463 records derived from the circular grid to identify frequent amino acid patterns.
Main Results:
- Arginine (arg) was found to be the most frequent amino acid on binding sites, while cysteine (cys) was the least frequent.
- Specific AA patterns on concave binding sites ({arg, glu, asp}, {arg, ser, asp}) frequently interact with convex sites ({lys}, {arg}) with 78% confidence.
- Patterns like {val, gly, lys} on convex sites interact with concave {asp} sites with over 81% confidence.
Conclusions:
- The proposed method effectively discovers significant amino acid patterns on protein binding sites.
- These discovered patterns enhance the prediction accuracy of protein-protein recognition.
- Data mining offers a powerful approach to uncover complex biological relationships not easily observed directly.
Related Concept Videos
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...
02:04Protein-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...
02:40Ligand 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-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...
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,...
00:49Ligand 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...
01:22Protein-Drug Binding: Determination Methods
Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...