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Intrinsically Disordered Proteins02:18

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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.
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Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
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Natural protein sequences are more intrinsically disordered than random sequences.

Jia-Feng Yu1, Zanxia Cao1,2, Yuedong Yang3

  • 1Shandong Provincial Key Laboratory of Biophysics, Institute of Biophysics, Dezhou University, Dezhou, 253023, China.

Cellular and Molecular Life Sciences : CMLS
|January 24, 2016
PubMed
Summary

Natural proteins contain more disordered regions than random sequences, suggesting evolution favors this to prevent aggregation and enhance functional diversity.

Keywords:
Molecular dynamics simulationMolten globuleProtein intrinsic disorderRandom sequenceSecondary structure

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Area of Science:

  • Proteomics
  • Bioinformatics
  • Evolutionary Biology

Background:

  • Understanding the evolutionary principles shaping natural protein sequences is crucial.
  • Previous studies on random proteins were limited by species-specific biases.

Purpose of the Study:

  • To investigate the differences between natural and randomized protein sequences.
  • To understand the role of intrinsic disorder in protein evolution.

Main Methods:

  • Generated 10,000 protein sequences randomized at the amino acid level.
  • Utilized established predictors for protein intrinsic disorder.
  • Employed molecular dynamics simulations to analyze protein structures.

Main Results:

  • Natural sequences exhibit significantly more long intrinsically disordered regions compared to random sequences.
  • Random and natural sequences show similar distributions of predicted secondary structures.
  • Molecular dynamics simulations suggest random sequences may form molten globular states.

Conclusions:

  • Natural protein evolution shows a bias towards intrinsic disorder.
  • This bias likely serves to prevent protein aggregation and expand functional capabilities.
  • Intrinsic disorder plays a key role in the functional repertoire of natural proteins.