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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.
The primary structure of a protein is its amino acid sequence.
Conservation of Protein Domains02:26

Conservation of Protein Domains

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...

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A perturbative view of protein structural variation.

Julián Echave1, Francisco M Fernández

  • 1Instituto Nacional de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Consejo Nacional de Investigación Científica y Técnicas & Universidad Nacional de La Plata, La Plata, Argentina. jechave@inifta.unlp.edu.ar

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Summary

Protein structural changes are primarily driven by physical responses to mutations, not just natural selection. A linearly forced elastic network model (LFENM) explains these conserved patterns across various protein types and perturbations.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Computational Biology

Background:

  • Lowest-energy collective normal modes were found to dominate protein structure evolution.
  • This dominance was previously attributed to functional importance and natural selection.
  • An alternative hypothesis proposed physical response to random mutations as the driver.

Purpose of the Study:

  • To test the hypothesis that protein structural divergence is a physical response to mutations.
  • To validate the linearly forced elastic network model (LFENM) in explaining these patterns.
  • To investigate if the LFENM applies to diverse perturbations beyond evolutionary divergence.

Main Methods:

  • Analysis of structural differences in homologous proteins (globin-like).
  • Examination of experimentally engineered myoglobin mutants (unselected).
  • Modeling using the linearly forced elastic network model (LFENM).
  • Assessment of structural changes under perturbations like ligand-binding and pH changes.

Main Results:

  • Lowest normal modes consistently dominate structural changes across all analyzed cases.
  • The LFENM quantitatively reproduces the observed structural divergence patterns.
  • Global conformational changes are driven by collective normal modes, independent of perturbation specifics.
  • Evolutionarily conserved protein cores show higher robustness to mutations.

Conclusions:

  • Protein structural variation patterns are a natural physical response to perturbations.
  • The LFENM provides a unified framework to model these responses.
  • Natural selection may not be the sole driver of evolutionary divergence in protein structures.
  • The model explains conserved structural cores and their robustness to mutations.