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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
Published on: July 14, 2015
Dissection, residue conservation, and structural classification of protein-DNA interfaces
Sumit Biswas1, Mainak Guharoy, Pinak Chakrabarti
1Department of Biochemistry, Bose Institute, Kolkata 700 054, India.
Proteins
|August 16, 2008
Summary
This study analyzes 128 protein-DNA interfaces, revealing conserved core residues crucial for binding energy, similar to protein-protein interactions. A new classification framework may unify the understanding of both interaction types.
Area of Science:
- Biochemistry
- Structural Biology
- Bioinformatics
Background:
- Protein-DNA interactions are fundamental to cellular processes.
- Understanding these interactions is key to deciphering biological mechanisms.
- Existing classifications of DNA-binding proteins may not fully capture interface characteristics.
Purpose of the Study:
- To analyze the structural features of protein-DNA interfaces.
- To compare protein-DNA interfaces with protein-protein interfaces.
- To develop a new classification scheme for DNA-binding proteins.
Main Methods:
- Analysis of 128 protein-DNA interfaces.
- Dissection of interfaces into core and rim regions.
- Sequence entropy analysis of interface residues.
- Comparison with existing classification systems.
Main Results:
- Protein-DNA interfaces, like protein-protein interfaces, have core and rim regions.
- Core residues exhibit lower sequence entropy, suggesting higher conservation and binding energy contribution.
- A new classification based on secondary structural elements was proposed.
- Differences in residue propensities for core and rim regions were observed.
Conclusions:
- A common framework for understanding both protein-protein and protein-DNA interactions may be feasible.
- Conserved core residues play a significant role in the binding free energy of protein-DNA complexes.
- The proposed classification scheme offers a novel perspective on DNA-binding proteins.
Related Concept Videos
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...
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...
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