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Protein-protein Interfaces

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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...
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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.
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Conservation of Protein Domains Over Different Proteins02:26

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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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.
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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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Advances in computational protein design.

Sheldon Park1, Xi Yang, Jeffery G Saven

  • 1Makineni Theoretical Laboratories and Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA.

Current Opinion in Structural Biology
|August 18, 2004
PubMed
Summary
This summary is machine-generated.

Computational protein design methods are advancing, enabling the creation of new proteins. These strategies, including dead-end elimination and simulated annealing, successfully design novel proteins over 100 residues.

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Area of Science:

  • Computational biology
  • Protein engineering
  • Biophysics

Background:

  • Methodological advancements are crucial for computational protein design.
  • Objective functions for sequence/structure compatibility require continuous improvement.

Purpose of the Study:

  • To highlight recent successes in computational protein design.
  • To showcase the application of advanced design strategies for novel protein creation.

Main Methods:

  • Utilizing disparate design strategies: dead-end elimination, simulated annealing, and statistical design.
  • Focusing on objective functions for quantifying sequence/structure compatibility.

Main Results:

  • Striking successes achieved with de novo designed proteins.
  • Demonstrated feasibility of designing proteins with sizes of 100 residues or greater.

Conclusions:

  • Advanced computational methods enable the design of novel proteins.
  • These techniques can also be applied to redesign natural proteins for research purposes.