β-defensin 135 Activators

β-Defensin 135, part of the β-defensin family, plays a crucial role in the innate immune system. Defensins are small, cysteine-rich cationic proteins found in vertebrates, including humans. Their primary function is to provide the first line of defense against a wide array of pathogens including bacteria, viruses, and fungi.The structure of β-defensin 135 is characterized by a beta-sheet topology. This structure is stabilized by disulfide bonds formed by its cysteine residues. The presence of these disulfide bonds is critical for maintaining the protein's stability and functionality. The β-defensin family members typically contain between 18 to 45 amino acids, making them relatively small compared to other immune system proteins.

β-Defensins, including β-defensin 135, are primarily expressed in epithelial cells, which form the barrier surfaces of the body. These include the skin, respiratory tract, and urogenital tract. Their expression can be induced by the presence of microbes and inflammatory signals, highlighting their role in immune surveillance and response.The mechanism of action of β-defensin 135, as with other defensins, involves disrupting the membrane integrity of pathogens. This disruption is achieved through their ability to insert into microbial membranes due to their cationic and amphipathic nature. This leads to pore formation in the membrane, resulting in the leakage of essential microbial contents and subsequent pathogen death.β-Defensin 135, like other defensins, also possesses immunomodulatory functions. It can attract immune cells such as dendritic cells and T cells to the site of infection, enhancing the adaptive immune response. Additionally, it can influence cytokine production, further modulating the immune response.