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Conservation of Protein Domains Over Different Proteins

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...

Protein Folding

Protein Folding

Protein Organization

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 Denaturation

Protein Denaturation

The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...

Conserved Binding Sites

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...

Conservation of Protein Domains

Conservation of Protein Domains

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Related Experiment Video

Updated: May 28, 2025

Differential Scanning Calorimetry — A Method for Assessing the Thermal Stability and Conformation of Protein Antigen

Differential Scanning Calorimetry — A Method for Assessing the Thermal Stability and Conformation of Protein Antigen

Published on: March 4, 2017

Statistical Thermodynamics of the Protein Ensemble: Mediating Function and Evolution.

Vincent J Hilser^1,2, James O Wrabl¹, Charles E F Millard^1,2

¹Department of Biology, Johns Hopkins University, Baltimore, Maryland, USA;

Annual Review of Biophysics

|February 10, 2025

Summary

Nature selects for protein

Keywords:

adaptation conformational change fold recognition local unfolding thermodynamic environment

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Last Updated: May 28, 2025

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Published on: July 16, 2017

Area of Science:

Protein dynamics and evolution
Biophysics
Structural biology

Background:

Proteins function through dynamic conformational fluctuations, not just static structures.
Understanding how these dynamics evolve is crucial for protein adaptation.

Purpose of the Study:

To investigate the role of local unfolding fluctuations in protein evolution.
To determine if conformational equilibria are evolutionarily conserved.
To develop methods for measuring and predicting these conserved energetics.

Main Methods:

Review of studies on local unfolding fluctuations in native protein states.
Analysis of adenylate kinase dynamics.
Elucidation of thermodynamic principles governing protein energetics.
Development of a quantitative probe for evolutionary conservation.
Testing sequence compatibility for multiple protein folds.

Main Results:

Local unfolding fluctuations are functionally important and ubiquitous in proteins.
Thermodynamic principles reveal conserved protein energetics.
These principles predict sequence compatibility across different protein folds.
The locally unfolded ensemble is a key mechanism in protein evolution.

Conclusions:

Protein evolution conserves not only ground states but also conformational equilibria.
Thermodynamic insights provide a new perspective on protein adaptation and metamorphic proteins.
The locally unfolded ensemble represents an emerging mechanism driving protein evolution.