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You are here:Home » Molecular Biology » MB-Growth Factors-Defensin » BD-4, Recombinant, Human (Beta-defensin 104, BEFB4)

BD-4, Recombinant, Human (Beta-defensin 104, BEFB4)


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Defensins (alpha and beta)are cationic peptides with a broad spectrum of antimicrobial activity thatcomprise an important arm of the innate immune system. The alpha-defensins aredistinguished from the beta-defensins by the pairing of their three disulfidebonds. To date, six human beta-defensins have been identified BD-1, BD-2, BD-3,BD-4, BD-5 and BD-6. beta-defensins are expressed on some leukocytes and atepithelial surfaces.nbsp In addition totheir direct antimicrobial activities, they can act as chemoattractants towardsimmature dendritic cells and memory T cells.nbspThe beta-defensin proteins are expressed as the C-terminal portion of precursorsand are released by proteolytic cleavage of a signal sequence and in somecases, a propeptide sequence. beta-defensins contain a six-cysteine motif thatforms three intra-molecular disulfide bonds.nbspnbspBD-4 is expressed intestis, stomach, uterus, neutrophils, thyroid, lung and kidney.nbsp In addition to its direct antimicrobialactivities, BD-4 is chemoattractant towards human blood monocytes.nbsp Recombinant human BD-4 is a 6.0kD proteincontaining 50 amino acid residues.
Catalog #143289
Biological ActivityDetermined by its ability to chemoattract human monocytes using a concentration range of 0.1-100.0ng/ml.
Quality ControlVerified by N-terminal and Mass Spectrometry analyses (when applicable).
Endotoxin<0.1ng/ug of protein (<1EU/ug).
Protein ContentVerified by UV Spectroscopy and/or SDS-PAGE gel.
Storage and StabilityStore lyophilized products at -20°C. For reconstituted solutions of most products, we recommend short-term storage at 4°C. For longer term storage the protein solution should be stored with a carrier protein (eg. 0.1% BSA) in working aliquots and stored frozen at -20°C. Additional freeze/thaw cycles may cause some denaturation of the protein.
SourceE. coli
Purity98% by SDS-PAGE gel and HPLC analyses.
FormSupplied as a lyophilized powder.
Important NoteThis product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.

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