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Related Concept Videos

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.
A protein's shape is critical to its function. For example, an enzyme...
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Disassembly of Intermediate Filaments01:35

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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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Globular and Fibrous Proteins02:21

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Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
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Fibrous Proteins00:55

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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
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Structural Protein Function01:56

Structural Protein Function

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Related Experiment Video

Updated: Apr 12, 2026

Silk Film Culture System for in vitro Analysis and Biomaterial Design
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Silk Film Culture System for in vitro Analysis and Biomaterial Design

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Silk structure and degradation.

Bin Liu1, Yu-wei Song1, Li Jin1

  • 1Key Laboratory of Freshwater Fish Reproduction and Development (Southwest University), Ministry of Education, Chongqing 400715, China; School of Life Science, Southwest University, Chongqing 400715, China.

Colloids and Surfaces. B, Biointerfaces
|May 19, 2015
PubMed
Summary

Silk degradation was studied in vitro and in vivo. Silk showed slow degradation, suggesting fibroin and sericin have similar immunogenicity and in vivo degradation involves cellular activity.

Keywords:
Bombyx mori L.DegradationFibroinSilkStructure

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Microfluidic Dry-spinning and Characterization of Regenerated Silk Fibroin Fibers
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Designing Silk-silk Protein Alloy Materials for Biomedical Applications
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Area of Science:

  • Biomaterials Science
  • Textile Science
  • Regenerative Medicine

Background:

  • Silk, a natural protein fiber, is widely used in biomedical applications due to its biocompatibility.
  • Understanding silk's degradation kinetics and host response is crucial for optimizing its use in tissue engineering and drug delivery.

Purpose of the Study:

  • To investigate the structural integrity and degradation properties of raw and degummed silk in vitro and in vivo.
  • To elucidate the mechanisms underlying silk degradation and its immunogenicity.

Main Methods:

  • Silk samples were subjected to degradation in various solutions (water, PBS, DMEM, F-DMEM) for 156 days.
  • Subcutaneous implantation in rats allowed for in vivo degradation analysis at multiple time points (7-145 days).
  • Structural analysis included scanning electron microscopy, frozen sectioning, and immunofluorescence staining (H.E., DAPI, Beta-actin, Collagen I).

Main Results:

  • In vitro weight loss varied across solutions, with degummed silk showing slightly higher degradation in water and F-DMEM.
  • In vivo, silk degradation initiated by 7 days post-implantation, with some non-degraded silk observed at 145 days.
  • Immunofluorescence staining indicated no significant difference in the immunogenicity between fibroin and sericin.

Conclusions:

  • Enzymatic activity plays a minor role in in vitro silk degradation.
  • In vivo silk degradation is primarily driven by cellular processes, including phagocytosis and fibroblast-mediated collagen secretion.
  • Silk exhibits a favorable degradation profile for biomedical applications, with potential for controlled host tissue integration.