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Related Concept Videos

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 Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Localizing frustration in native proteins and protein assemblies.

Diego U Ferreiro1, Joseph A Hegler, Elizabeth A Komives

  • 1Center for Theoretical Biological Physics and Department of Chemistry and Biochemistry, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0365, USA.

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|December 14, 2007
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Summary

We developed a new method to quantify frustration in protein interactions. Natural proteins minimize frustration locally, while binding sites show reduced frustration upon complex formation.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Computational Biology

Background:

  • Protein energy landscapes guide folding to native states, often described by global funneling criteria.
  • The principle of minimal frustration suggests proteins evolve to avoid energetically unfavorable configurations.
  • Understanding local interactions is crucial for predicting protein behavior and function.

Purpose of the Study:

  • To introduce a novel method for quantifying spatially local frustration in protein biomolecules.
  • To generalize existing global criteria for protein energy landscapes to a local level.
  • To investigate the distribution and characteristics of frustrated interactions in natural proteins.

Main Methods:

  • Development of a localization-based method to quantify frustration in protein interactions.
  • Application of the method to analyze a structural database of natural proteins.
  • Comparison of frustration levels in free proteins versus protein complexes.

Main Results:

  • Natural proteins exhibit a complex network of minimally frustrated local interactions.
  • Highly frustrated interactions are predominantly located on protein surfaces, often near binding sites.
  • Protein complex formation leads to a significant decrease in frustration at binding sites.

Conclusions:

  • The proposed method effectively quantifies local frustration, complementing global energy landscape principles.
  • Natural proteins are optimized through a balance of minimally frustrated local interactions.
  • Binding sites undergo significant frustration reduction upon complex formation, facilitating molecular recognition.