产品描述 概述Defensins (alpha and beta) are cationic peptides with antimicrobial activity against Gram-negative and Gram-positive bacteria, fungi, and enveloped viruses. They are 2-6 k Da proteins and take important roles in innate immune system. On the basis of their size and pattern of disulfide bonding, mammalian defensins are classified into alpha, beta and theta categories. β-Defensins contain a six-cysteine motif that forms three intra-molecular disulfide bonds. Four human β-defensins have been identified and they are expressed on some leukocytes and at epithelial surfaces. Because β-defensins is cationic peptides, they can therefore interact with the membrane of invading microbes, which are negative due to lipopolysaccharides (LPS) and lipoteichoic acid (LTA) found in the cell membrane. Especially, they have higher affinity to the binding site compared to Ca2+ and Mg2+ ions. Furthermore, they can affect the stability of the membrane. 使用说明This material is offered by Novin Biotech for research, laboratory or further evaluation purposes. NOT FOR HUMAN USE. 技术规格| Physical Appearance | Sterile Filtered White lyophilized (freeze-dried) powder. | | Purity | > 95 % by SDS-PAGE and HPLC analyses. | | Source | Escherichia coli. | | Biological Activity | Fully biologically active when compared to standard. The ED50 as determined by anti-microbial activity against E.coli. is less than 20 μg/ml, corresponding to a specific activity of > 50 IU/mg. | | Formulation | Lyophilized from a 0.2 μm filtered concentrated solution in 2 × PBS, pH 7.4. | | Endotoxin | Less than 1EU/μg of rMuBD-3 as determined by LAL method. | | Reconstitution | We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute in sterile distilled water or aqueous buffer containing 0.1 % BSA to a concentration of 0.1-1.0 mg/mL. Stock solutions should be apportioned into working aliquots and stored at ≤ -20 °C. Further dilutions should be made in appropriate buffered solutions. | | AA Sequence | KKINNPVSCL RKGGRCWNRC IGNTRQIGSC GVPFLKCCKR K |
|
