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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
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A living cell's primary tasks of obtaining, transforming, and using energy to do work may seem simple. However, the second law of thermodynamics explains why these tasks are harder than they appear. None of the energy transfers in the universe are completely efficient. In every energy transfer, some amount of energy is lost in a form that is unusable. In most cases, this form is heat energy. Thermodynamically, heat energy is defined as the energy transferred from one system to another that...
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Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
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Entropy, Fluctuations, and Disordered Proteins.

Eshel Faraggi1,2, A Keith Dunker3, Robert L Jernigan4

  • 1Department of Physics, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA.

Entropy (Basel, Switzerland)
|April 28, 2020
PubMed
Summary
This summary is machine-generated.

Protein disorder is linked to sequence and structure fluctuations. Disordered sites show variability, suggesting their role in protein function and interaction dynamics.

Keywords:
entropyfluctuationsmutationsprotein disorderprotein structure

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Area of Science:

  • Computational Biology
  • Protein Science
  • Bioinformatics

Background:

  • Protein disorder is a key factor influencing protein function and dynamics.
  • Understanding the relationship between protein sequence, structure, and disorder is crucial.

Purpose of the Study:

  • To investigate the correlation between protein disorder, sequence, and structural fluctuations.
  • To explore the characteristics of disordered residues and their functional implications.

Main Methods:

  • Clustering of structurally related proteins.
  • Analysis of multiple-sequence alignments (MSA) to derive sequence and structure entropy.
  • Development of parameters to measure fluctuations at MSA sites.

Main Results:

  • Negative correlation found between protein disorder and structure; positive correlation with system fluctuations.
  • Disordered residues are conserved in proximate sites and occur in exposed regions (positive correlation with accessible surface area).
  • Fluctuations in dihedral angles at disordered sites are positively correlated with disorder, while proximal sites show negative correlation.

Conclusions:

  • Disordered protein sites exhibit permissible variability, while interacting regions show increased rigidity.
  • These findings support the involvement of intrinsically disordered regions in protein function and regulation.