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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
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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.
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Amyloid Fibrils03:03

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Protein Organization01:24

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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
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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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Protein and Protein Structure02:15

Protein and Protein Structure

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Updated: Jun 7, 2025

Microfluidic Mixers for Studying Protein Folding
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Microfluidic Mixers for Studying Protein Folding

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Protein folding: Funnel model revised.

Irena Roterman1, Mateusz Slupina1, Leszek Konieczny2

  • 1Department of Bioinformatics and Telemedicine, Jagiellonian University Medical College, Medyczna 7, 30-688 Kraków, Poland.

Computational and Structural Biotechnology Journal
|November 11, 2024
PubMed
Summary
This summary is machine-generated.

Protein structure depends on environmental conditions. The modified Fuzzy Oil Drop (FOD-M) model quanties environmental influences on protein folding, representing the environment as a force field.

Keywords:
ChaperoneChaperoninDown-hillEnzymesExternal force fieldFast-foldingFunnel modelHydrophobicityMembrane proteinsProtein foldingin silico analysis

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Area of Science:

  • Protein structure and folding
  • Biophysics
  • Computational biology

Background:

  • Protein spatial structure is determined by amino acid sequences and environmental conditions.
  • Aqueous environments favor polar residue exposure, while membranes favor hydrophobic residue exposure.
  • The Fuzzy Oil Drop (FOD) model describes protein structure based on hydrophobic core distribution.

Purpose of the Study:

  • To extend the FOD model to include diverse environmental influences on protein folding.
  • To develop a modified FOD model (FOD-M) representing the environment as a continuum force field.
  • To assess the impact of non-aqueous factors on protein structural organization.

Main Methods:

  • Application of the developed modified Fuzzy Oil Drop model (FOD-M).
  • Representation of environmental conditions as a continuum external force field.
  • Modification of the protein folding funnel model incorporating the K scale.

Main Results:

  • The FOD-M model quantifies the influence of various environmental factors on protein structure.
  • Environmental conditions can be represented as a force field influencing the folding energy landscape.
  • The K scale measures the contribution of non-polar water factors in the protein folding process.

Conclusions:

  • The modified FOD model (FOD-M) provides a framework for understanding environmental impacts on protein folding.
  • Protein folding is adaptable to diverse environmental conditions beyond aqueous solutions.
  • The K scale offers a quantitative measure for environmental influence on protein structural dynamics.