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 kDa 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.

高纯度、高活性、低内毒素、高批间一致性

SDS-PAGE

Human BD-5 on SDS-PAGE under reduced condition. The purity is greater than 95%.

-25 ~ -15℃保存，收到货之后有效期1年。
复溶后，无菌条件下，2~8℃保存，7天有效期。复溶后， 无菌条件下，-85 ~ -65℃保存，3个月有效期。