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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 Organization01:13

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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.
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...

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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

Design of stable alpha-helices using global sequence optimization.

Michael Petukhov1, Yoshiro Tatsu, Kazuyo Tamaki

  • 1Petersburg Institute of Nuclear Physics, the Russian Academy of Sciences, 188300, Gatchina, Russia. michael.petukhov@gmail.com

Journal of Peptide Science : an Official Publication of the European Peptide Society
|February 18, 2009
PubMed
Summary
This summary is machine-generated.

Designing stable alpha-helices in peptides is now possible using a new computational method. This approach optimizes amino acid sequences for predictable helical content, aiding protein engineering.

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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues

Published on: July 14, 2015

Area of Science:

  • Biochemistry
  • Computational Biology
  • Protein Engineering

Background:

  • Understanding protein folding and stability is crucial for protein engineering.
  • Helix-coil transition models have advanced, enabling better predictions of peptide and protein helix stability.
  • Accurate prediction of helix stability facilitates rational protein design.

Purpose of the Study:

  • To introduce a novel computational method for designing alpha-helices in peptides and proteins.
  • To optimize amino acid sequences for enhanced helix stability and predictable helical content.
  • To explore the potential of short peptides in forming stable alpha-helical structures.

Main Methods:

  • Utilized the AGADIR statistical mechanical theory for helix-coil transitions in monomeric peptides.
  • Employed a tunneling algorithm for global optimization of multidimensional functions to select optimal amino acid sequences.
  • Performed Circular Dichroism (CD) measurements to experimentally determine the helical content of designed peptides.

Main Results:

  • The developed method successfully designs peptides with stable alpha-helical structures.
  • Optimized sequences allow for the formation of stable alpha-helices in peptides as short as 10 residues.
  • Maximum achievable helix content (HC) for fully optimized short peptides at 5°C is approximately 70-75%.

Conclusions:

  • The new computational method offers a powerful tool for protein engineering by enabling the design of stable alpha-helices.
  • This approach systematically optimizes sequences, unlike traditional methods that focus on limited structural modifications.
  • The findings demonstrate that amino acid sequences can be rationally designed to achieve significant helical content in short peptides.