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Related Concept Videos

Protein-protein Interfaces02:04

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 Interfaces02:04

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 Networks02:26

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,...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Ligand Binding Sites02:40

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...

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Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins
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SOFTDOCK application to protein-protein interaction benchmark and CAPRI.

Nan Li1, Zhonghua Sun, Fan Jiang

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.

Proteins
|September 7, 2007
PubMed
Summary

SOFTDOCK, a coarse-grained molecular docking tool, effectively samples complex conformations using a novel Voronoi molecular surface. Its geometry and electrostatic scores enhance accuracy, while increased surface thickness improves results.

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Area of Science:

  • Computational Biology
  • Structural Bioinformatics
  • Drug Discovery

Background:

  • Molecular docking is crucial for understanding protein-ligand interactions.
  • Accurate sampling and scoring of conformations are key to successful molecular docking.
  • SOFTDOCK is an open-source package for coarse-grained molecular docking.

Purpose of the Study:

  • To evaluate the performance of the SOFTDOCK package for molecular docking.
  • To identify key scoring functions for discriminating near-native conformations.
  • To assess the impact of Voronoi surface thickness and clustering on docking accuracy.

Main Methods:

  • SOFTDOCK employs a coarse-grained docking approach with a novel Voronoi molecular surface.
  • Grid-based geometry and electrostatics scores were investigated, alongside an atom-based solvation score.
  • The study utilized a leave-one-out test and the Critical Assessment of PRedicted Interactions (CAPRI) benchmark.

Main Results:

  • Three geometry scores and an FTDOCK-like electrostatics score were most effective for discriminating near-native conformations.
  • An atom-based solvation score showed ineffectiveness.
  • Increased Voronoi surface thickness significantly improved docking accuracy.
  • Clustering improved overall ranking but reduced docking accuracy.

Conclusions:

  • SOFTDOCK, particularly with optimized Voronoi surface thickness, offers a promising approach for molecular docking.
  • The study highlights the importance of specific scoring functions and the limitations of clustering in certain contexts.
  • SOFTDOCK's application in CAPRI demonstrated its potential, with results comparable to established methods.