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Related Concept Videos

Protein Folding01:25

Protein Folding

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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.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Protein Folding01:22

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Molecular Chaperones and Protein Folding03:00

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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.
The...
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Protein Folding Quality Check in the RER01:29

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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
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Exploring the Levinthal limit in protein folding.

Leonor Cruzeiro1, Léo Degrève2

  • 1CCMAR and FCT, Universidade do Algarve, Campus de Gambelas, Faro, 8005-139, Portugal. lhansson@ualg.pt.

Journal of Biological Physics
|October 16, 2016
PubMed
Summary
This summary is machine-generated.

Protein folding may be a kinetic process, not solely dictated by thermodynamics. Simulations show native and non-native protein states share similar stabilizing interactions, challenging unique native state determination.

Keywords:
Kinetic mechanismMolecular dynamicsProtein folding

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Area of Science:

  • Biophysics
  • Computational Biology
  • Protein Folding Dynamics

Background:

  • The thermodynamic hypothesis posits that a protein's amino acid sequence uniquely determines its native structure.
  • Levinthal's paradox suggests the native state is a free energy minimum, allowing multiple stable conformations.
  • The Levinthal limit explores the conformational space and stability of protein structures.

Purpose of the Study:

  • To investigate the energetic landscape of protein folding beyond the native state.
  • To compare stabilizing interactions in native versus non-native protein conformations.
  • To evaluate Levinthal's hypothesis regarding protein folding as a kinetic, non-equilibrium process.

Main Methods:

  • Utilized computer simulations to analyze protein structures.
  • Compared stabilizing interactions in native states of four proteins against three non-native states each.
  • Assessed the degree of fluctuation in non-native conformers.

Main Results:

  • Identified highly similar interaction profiles stabilizing both native and non-native protein conformers (16 total).
  • Observed enhanced fluctuations in non-native states, attributable to incomplete relaxation to local free energy minima.
  • Found no unique interaction signature distinguishing native from non-native states.

Conclusions:

  • Results support Levinthal's hypothesis, suggesting protein folding is a kinetic, non-equilibrium process.
  • Challenges the notion of a single, thermodynamically defined native protein state.
  • Highlights the role of kinetics and relaxation in achieving protein structure.