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Related Concept Videos

Protein Organization01:13

Protein Organization

Overview
Protein Folding01:22

Protein Folding

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.
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 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.

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

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Published on: July 25, 2013

A new folding paradigm for repeat proteins.

Tommi Kajander1, Aitziber L Cortajarena, Ewan R G Main

  • 1Department of Molecular Biophysics and Biochemistry, Physics and Applied Physics, and Chemistry, Yale University, New Haven, Connecticut 06520, USA.

Journal of the American Chemical Society
|July 21, 2005
PubMed
Summary

A new theoretical model, the Ising model, quantitatively describes protein folding transitions for tetratricopeptide repeat proteins. This model is the first to predict key folding parameters like transition midpoint and width.

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Area of Science:

  • Protein biophysics
  • Computational biology
  • Structural biology

Background:

  • Tetratricopeptide repeat (TPR) proteins are crucial in various biological processes.
  • Understanding the folding/unfolding mechanisms of TPR proteins is essential for protein engineering and drug design.
  • Current models for protein folding may not fully capture the behavior of repeat proteins.

Purpose of the Study:

  • To quantitatively describe the folding/unfolding transitions of designed consensus tetratricopeptide repeat proteins.
  • To introduce and validate a new theoretical folding paradigm for repeat proteins.
  • To establish a predictive model for protein folding transition parameters.

Main Methods:

  • Application of the classical one-dimensional Ising model to analyze protein folding/unfolding.
  • Design and synthesis of a series of consensus tetratricopeptide repeat proteins.
  • Quantitative analysis of folding/unfolding transition thermodynamics.

Main Results:

  • The one-dimensional Ising model successfully describes the folding/unfolding transitions of the studied TPR proteins.
  • This represents a novel folding paradigm for proteins composed of repeating units.
  • The theoretical model accurately predicts the folding/unfolding transition midpoint and transition width for the first time for any protein.

Conclusions:

  • The Ising model provides a powerful framework for understanding the thermodynamics of TPR protein folding.
  • This work establishes a new theoretical approach for predicting protein folding behavior.
  • The findings have implications for the rational design of proteins with desired stability and folding characteristics.