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Collagens are the Major Structural Proteins of ECM01:13

Collagens are the Major Structural Proteins of ECM

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Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
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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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Peptide Bonds

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Stereoisomerism of Cyclic Compounds02:33

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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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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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A thermodynamic system with zero heat exchange and work is an isolated system. For these systems, the internal energy remains constant.
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Structural optimization of cyclic peptides that efficiently detect denatured collagen.

Koh K Takita1, Kazunori K Fujii, Kento Ishii

  • 1Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Japan.

Organic & Biomolecular Chemistry
|July 26, 2019
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Summary

Researchers developed cyclic collagen-mimetic peptides (cCMPs) that detect denatured collagen without pre-treatment. These optimized cCMPs enable facile detection of various collagen types and visualization of denatured collagen fibrils.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Biotechnology

Background:

  • Collagen denaturation is a key indicator in various biological processes and diseases.
  • Existing methods for detecting denatured collagen often require complex pre-treatments, such as peptide disassembly.
  • Cyclic collagen-mimetic peptides (cCMPs) show promise but typically require disassembly before use.

Purpose of the Study:

  • To develop a facile and efficient method for detecting denatured collagen.
  • To engineer cCMPs that do not require pre-treatment for disassembly.
  • To investigate the structure-activity relationship of cCMPs for improved denatured collagen detection.

Main Methods:

  • Investigated structure-activity relationships of cyclic collagen-mimetic peptides (cCMPs).
  • Engineered cCMPs with charge repulsion and backbone deformation to prevent self-assembly.
  • Utilized optimized cCMPs for western blotting detection of collagen types I-V.
  • Visualized denatured collagen fibrils in cell culture systems.

Main Results:

  • Developed novel cCMPs that detect denatured collagen without disassembly.
  • Introduced charge repulsion and backbone deformation to enhance peptide stability and function.
  • Successfully detected collagen types I-V using western blotting.
  • Visualized denatured collagen fibrils in a cellular context, demonstrating practical application.

Conclusions:

  • Optimized cCMPs offer a simplified and effective approach for denatured collagen detection.
  • The engineered cCMPs overcome limitations of previous prototypes by eliminating the need for pre-treatment.
  • This method holds potential for diagnostics and research involving collagen denaturation.