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Related Concept Videos

Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

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.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
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

Overview
Protein Organization01:13

Protein Organization

Overview
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.
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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...

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Related Experiment Video

Updated: Jul 5, 2026

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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REACH coarse-grained biomolecular simulation: transferability between different protein structural classes.

Kei Moritsugu1, Jeremy C Smith

  • 1Center for Molecular Biophysics, University of Tennessee/Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

Biophysical Journal
|May 13, 2008
PubMed
Summary
This summary is machine-generated.

The Realistic Extension Algorithm via Covariance Hessian (REACH) method enables coarse-grained protein simulations. A single, transferable REACH force field can now model diverse protein dynamics without system-specific parameterization.

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Area of Science:

  • Computational biology
  • Biophysics
  • Structural biology

Background:

  • Coarse-graining simplifies large biological system simulations.
  • Current methods often require iterative optimization for parameterization.

Purpose of the Study:

  • To assess the transferability of the REACH coarse-graining method across different protein structural classes.
  • To develop a generic REACH force field applicable to various proteins.

Main Methods:

  • Utilized the Realistic Extension Algorithm via Covariance Hessian (REACH) method.
  • Calculated force constants from atomistic molecular dynamics (MD) variance-covariance matrices.
  • Performed coarse-grained MD (CGMD) simulations and compared with atomistic MD.

Main Results:

  • REACH force constants showed high similarity across myoglobin, plastocyanin, and dihydrofolate reductase.
  • CGMD simulations accurately reproduced atomistic MD mean-square fluctuations.
  • Averaged CG interaction functions yielded results consistent with atomistic MD.

Conclusions:

  • The REACH force field demonstrates excellent transferability across diverse protein structures.
  • A single, generic REACH force field can be used for protein studies, eliminating system-specific parameterization.
  • REACH offers a reliable and computationally efficient approach for simulating protein dynamics.