DEFA3
DEFA3 or Defensin, alpha 3, neutrophil-specific is a protein that in humans is encoded by the DEFA3 gene. This protein is part of the defensin family, which are cationic peptides with a broad spectrum of antimicrobial activity that form an integral part of the innate immune system.
Function[edit | edit source]
The DEFA3 protein is secreted by neutrophils, a type of white blood cell, and plays a crucial role in the body's defense against bacterial, viral, and fungal pathogens. It does this by disrupting the cell membranes of these pathogens, leading to their death.
Structure[edit | edit source]
DEFA3 is a small protein, consisting of 30-35 amino acids. It has a characteristic structure, with three intramolecular disulfide bonds that form a triple-stranded beta-sheet structure. This structure is thought to be responsible for its antimicrobial activity.
Clinical significance[edit | edit source]
Alterations in the DEFA3 gene have been associated with various diseases. For example, a decrease in DEFA3 expression has been observed in patients with sepsis, suggesting that this protein may play a role in the body's response to severe infection. Additionally, variations in the DEFA3 gene have been linked to susceptibility to HIV infection and progression to AIDS.
See also[edit | edit source]
References[edit | edit source]
External links[edit | edit source]
- DEFA3 at the National Center for Biotechnology Information
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