SLPI Protein, Human (107a.a, Sf9, His)

The SLPI protein is an acid-stable protease inhibitor that has shown strong affinity for trypsin, chymotrypsin, elastase, and cathepsin G in multiple studies. It plays a critical regulatory role in inflammatory and immune responses following bacterial infection and Listeria monocytogenes infection. SLPI Protein, Human (107a.a, Sf9, His) is the recombinant human-derived SLPI protein, expressed by Sf9 insect cells , with C-His labeled tag. The total length of SLPI Protein, Human (107a.a, Sf9, His) is 107 a.a., with molecular weight of ~19 kDa.

SLPI, an acid-stable proteinase inhibitor, exhibits robust affinities for trypsin, chymotrypsin, elastase, and cathepsin G, as demonstrated in various studies. It plays a crucial role in modulating inflammatory and immune responses following bacterial infection, as well as infection by the intracellular parasite L.major. Additionally, SLPI contributes to down-regulating responses to bacterial lipopolysaccharide (LPS) (By similarity) and is involved in regulating the activation of NF-kappa-B, thereby influencing inflammatory responses. Notably, SLPI exhibits antimicrobial activity against mycobacteria but not against salmonella, contributing to normal resistance against infection by M.tuberculosis. It is also essential for normal resistance to infection by L.major and plays a critical role in wound healing, likely by preventing tissue damage through the regulation of protease activity (By similarity). Furthermore, in collaboration with ELANE, SLPI is required for the normal differentiation and proliferation of bone marrow myeloid cells, and it interacts with GRN, protecting progranulin from proteolysis.

Measured by its ability to inhibit trypsin cleavage of a fluorogenic peptide substrate Mca-RPKPVE-Nval-WRK (Dnp)-NH2 and the IC₅₀ value is <1 Nm.

Human

Sf9 insect cells

C-His

P03973 (S26-A132)

6590  [NCBI]

Approximately 19 kDa

Greater than 90% as determined by reducing SDS-PAGE

Lyophilized powder

Lyophilized from a 0.2 μm filtered solution of 20 mM Tris, 500 mM NaCl, pH 7.4, 10% Glycerol. Normally 5 % - 8 % trehalose, mannitol and 0.01% Tween 80 are added as protectants before lyophilization.

<1 EU/μg, determined by LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O.

Stored at -20°C for 2 years. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Room temperature in continental US; may vary elsewhere.