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Related Concept Videos

Protein Folding01:25

Protein Folding

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.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Folding01:22

Protein Folding

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Protein Folding01:22

Protein Folding

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Protein Organization01:24

Protein 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.
Protein Organization01:13

Protein Organization

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Conserved Binding Sites01:49

Conserved 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...

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Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules
10:58

Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules

Published on: July 25, 2013

Simulating protein folding initiation sites using an alpha-carbon-only knowledge-based force field.

Patrick M Buck1, Christopher Bystroff

  • 1Department of Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA.

Proteins
|January 13, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces the Carbon-alpha force field (CALF) for simulating protein folding. CALF accurately predicts native structures for many peptide sequences, advancing our understanding of hierarchical protein folding.

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Area of Science:

  • Computational Biology
  • Biophysics
  • Structural Biology

Background:

  • Protein folding is a hierarchical process, with local structures forming before global ones.
  • Specific short sequence segments can initiate folding independently of their 3D context.

Purpose of the Study:

  • To develop and validate a knowledge-based force field (CALF) for simulating protein folding.
  • To assess the ability of CALF to predict native structures from local sequence information.

Main Methods:

  • Constructed CALF, a force field using sequence-specific statistical potentials based on database frequencies.
  • Simulated folding of 27 short peptides using Brownian dynamics.
  • Introduced hydrogen bond potentials conditional on local sequence predictions.
  • Assessed simulation convergence and structural accuracy using clustering and RMSD analysis.

Main Results:

  • For 21 out of 27 sequences, the largest structural cluster represented over half the simulation trajectory.
  • 14 of these sequences showed cluster centers within 2.6 Å RMSD of their native structure.
  • Simulations of full-length proteins retained overall topology and compactness, despite deviations from native states.

Conclusions:

  • The CALF force field, incorporating local sequence patterns, shows promise for simulating protein folding initiation.
  • A potential that effectively models local folding and global stabilization could lead to more realistic hierarchical folding pathway simulations.