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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Capturing coacervate formation and protein partition by molecular dynamics simulation.

Yang Liu1,2, Xinyan Wang2, Zhili Wan3

  • 1College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University Chengdu 610065 China.

Chemical Science
|February 9, 2023
PubMed
Summary

Complex coacervates, mimicking cellular environments, were simulated to understand biomolecule behavior. Actin protein was observed to spontaneously partition to coacervate peripheries, aiding biological function understanding.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Cell Biology

Background:

  • Biomolecules function within regulated microenvironments.
  • Cellular mimics and artificial bioreactors are used to study membraneless organelles and early life conditions.

Purpose of the Study:

  • To reproduce experimental salt concentration and pH dependencies of complex coacervates using molecular dynamics simulations.
  • To investigate the behavior of coacervates within vesicles and the partitioning of actin.
  • To enhance understanding of coacervate platforms for biomolecule organization.

Main Methods:

  • Molecular dynamics simulations utilizing the Martini 3.0 model.
  • Analysis of coacervate shape changes within vesicles.
  • Exploration of actin partitioning within coacervate systems.

Main Results:

  • Simulations successfully reproduced experimental salt and pH dependencies of complex coacervates.
  • Coacervates confined within vesicles exhibited shape-changing capabilities.
  • The cytoskeletal protein actin demonstrated spontaneous partitioning to the peripheries of all tested coacervates.

Conclusions:

  • The study provides insights into the versatile nature of coacervate platforms.
  • Understanding biomolecule partitioning in coacervates is crucial for their biological roles.
  • This research contributes to the study of cellular microenvironments and biomolecular organization.