Defensin
Defensin — A family of small cysteine-rich antimicrobial peptides produced by epithelial and immune cells, forming pores in microbial membranes.
What Is a Defensin?
Defensins are a family of cysteine-rich cationic antimicrobial peptides (29-45 residues) found in vertebrates, invertebrates, and plants. Human defensins are classified as alpha-defensins (HNP-1 to 4, HD-5, HD-6) produced by neutrophils and Paneth cells, and beta-defensins (hBD-1 to 4) expressed by epithelial cells. They are key components of innate immunity.
Mechanism
- Structure: Triple-stranded beta-sheet stabilized by 3 conserved disulfide bonds
- Antimicrobial: Membrane disruption of gram-negative and gram-positive bacteria, fungi, and enveloped viruses
- Immunomodulatory: Chemoattractant for dendritic cells, T cells, and monocytes
Frequently Asked Questions
What is Defensin?
A family of small cysteine-rich antimicrobial peptides produced by epithelial and immune cells, forming pores in microbial membranes.
Why is Defensin important in peptide research?
Defensin is a fundamental concept in compound as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.