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Related Concept Videos

Defense Mechanism Against Infection01:26

Defense Mechanism Against Infection

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Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
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Exon Recombination02:32

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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Antimicrobial Proteins01:23

Antimicrobial Proteins

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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Protein Denaturation01:28

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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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Defenses Against Pathogens and Herbivores02:26

Defenses Against Pathogens and Herbivores

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Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
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Caspases01:24

Caspases

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Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
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Related Experiment Video

Updated: Jul 12, 2025

Live-cell Imaging of Fungal Cells to Investigate Modes of Entry and Subcellular Localization of Antifungal Plant Defensins
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Live-cell Imaging of Fungal Cells to Investigate Modes of Entry and Subcellular Localization of Antifungal Plant Defensins

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The Function and Modification of Human Defensin 5.

Xin-Yue Chang1, Meng-Wei Zhang1, Lin-Jie Zhang1

  • 1School of Life Sciences, Henan University, Kaifeng 475004, China.

Protein and Peptide Letters
|October 20, 2023
PubMed
Summary

Human defensin 5 (HD5) is a key host defense peptide with antibacterial, antiviral, and anti-tumor functions. Modifications to HD5 are crucial for enhancing its therapeutic potential and clinical applications.

Keywords:
HD5bacterial infectionimmunitymodification.tumor generationviral infection

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Last Updated: Jul 12, 2025

Live-cell Imaging of Fungal Cells to Investigate Modes of Entry and Subcellular Localization of Antifungal Plant Defensins
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Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Human defensin 5 (HD5) is a critical component of innate immunity, exhibiting potent antibacterial and antiviral activities.
  • HD5 also plays a significant role in regulating immune responses and inhibiting tumor cell proliferation.
  • Potential cytotoxic and pro-inflammatory side effects necessitate careful consideration of HD5's biological functions.

Conclusions:

  • HD5 is a vital host defense peptide with diverse physiological roles.
  • Engineering HD5 holds promise for optimizing its therapeutic efficacy and safety.
  • Further research into HD5 modification is essential for advancing its clinical utility.