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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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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Protein Folding01:25

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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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Bacterial Protein Maturation01:26

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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...

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How to Stabilize Protein: Stability Screens for Thermal Shift Assays and Nano Differential Scanning Fluorimetry in the Virus-X Project
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Published on: February 11, 2019

Macromolecular crowding and protein stability.

Yaqiang Wang1, Mohona Sarkar, Austin E Smith

  • 1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, USA.

Journal of the American Chemical Society
|September 8, 2012
PubMed
Summary
This summary is machine-generated.

Cellular chemistry is influenced by protein crowding. Chemical interactions, not just hard-core repulsions, significantly impact protein stability in crowded environments.

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Area of Science:

  • Biochemistry
  • Chemical Physics
  • Molecular Biology

Background:

  • Cellular environments are crowded, affecting protein stability and function.
  • Protein stability is influenced by excluded volume (hard-core) and chemical interactions.
  • Previous studies often emphasized hard-core repulsions as the primary driver of crowding effects.

Purpose of the Study:

  • To investigate the contributions of both hard-core repulsions and chemical interactions to protein stability under crowded conditions.
  • To quantify the entropic and enthalpic components of crowding effects on protein stability.
  • To elucidate the mechanisms behind protein behavior in cellular environments.

Main Methods:

  • Utilized Nuclear Magnetic Resonance (NMR)-detected amide proton exchange to measure temperature dependence.
  • Analyzed temperature-dependent data to extract entropic and enthalpic contributions.
  • Focused on ubiquitin as a model protein to assess crowding effects.

Main Results:

  • Chemical interactions contribute significantly to protein stability in crowded environments.
  • The influence of chemical interactions often outweighs that of hard-core repulsions.
  • Crowding effects on protein stability are a complex interplay of entropic and enthalpic factors.

Conclusions:

  • Both chemical interactions and hard-core repulsions are crucial for understanding protein stability in crowded biological systems.
  • The findings challenge the predominant focus on hard-core repulsions in previous crowding studies.
  • This work provides a more comprehensive explanation for protein stability and dynamics observed within cells.