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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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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 Denaturation01:28

Protein Denaturation

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The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
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The Unfolded Protein Response01:37

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The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
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Fibril-associated Collagen01:11

Fibril-associated Collagen

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Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
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Proteins: From Genes to Degradation02:11

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Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick.  Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
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Related Experiment Video

Updated: May 15, 2025

Imaging Denatured Collagen Strands In vivo and Ex vivo via Photo-triggered Hybridization of Caged Collagen Mimetic Peptides
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Imaging Denatured Collagen Strands In vivo and Ex vivo via Photo-triggered Hybridization of Caged Collagen Mimetic Peptides

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Decoding collagen's thermally induced unfolding and refolding pathways.

Alaa Al-Shaer1, Nancy R Forde1,2

  • 1Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.

Proceedings of the National Academy of Sciences of the United States of America
|May 13, 2025
PubMed
Summary
This summary is machine-generated.

Collagen type IV proteins destabilize at body temperature, but disulfide bonds and a conserved cystine knot aid refolding and stability. This study reveals key mechanisms for collagen structure and mechanics.

Keywords:
atomic force microscopy (AFM)collagen foldingcystine knotsingle-moleculethermal stability

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Imaging Denatured Collagen Strands In vivo and Ex vivo via Photo-triggered Hybridization of Caged Collagen Mimetic Peptides
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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Collagen is crucial for extracellular structures, but its large size hinders high-resolution studies.
  • Understanding collagen stability at body temperature is vital for tissue mechanics.

Purpose of the Study:

  • To investigate the thermal response and refolding pathways of full-length collagen type IV.
  • To analyze the influence of sequence and disulfide bonds on collagen IV stability and mechanics.

Main Methods:

  • Atomic Force Microscopy (AFM) imaging to study thermal response.
  • Analysis of contour length, bending stiffness, and unfolding initiation sites.
  • In vitro refolding experiments and multiple sequence alignment.

Main Results:

  • Collagen type IV shows time-dependent structural destabilization at body temperature.
  • Disulfide bonds enhance thermal stability and act as refolding nucleation sites.
  • A conserved interchain cystine knot facilitates C-to-N-terminal folding, crucial for early structure stabilization.

Conclusions:

  • Mechanistic insights into collagen IV unfolding and refolding pathways.
  • Heterogeneous sequences and specific structural motifs significantly influence collagen stability and mechanics.
  • Findings highlight the evolutionary significance of the cystine knot in collagen IV structure.