LEKTI is a large multidomain serine protease inhibitor expressed in stratified epithelial tissue. It consists of 15 domains that are cleaved into smaller, functional fragments by the protease furin. Only two of these domains (2 and 15) contain 6 evenly spaced cysteines responsible for 3 intramolecular disulfide bonds characteristic of Kazal-type related inhibitors. The remaining domains contain 4 cysteines. These disulfide bonds force the molecule into a rigid conformation that enables the protein to interact with a target protease via an extended beta-sheet. All domains (excepting 1, 2 and 15) contain an arginine at P1, indicating trypsin-like proteases are the likely targets. In the epidermis, LEKTI is implicated in the regulation of desquamation via its ability to selectively inhibit KLK5, KLK7 and KLK14. Recombinant full length LEKTI inhibits the exogenous serine proteases trypsin, plasmin, subtilisin A, cathepsin G and human neutrophil elastase. Mutations in the SPINK5 gene result in Netherton syndrome, a disorder characterized by ichthyosis and specific immune system defects.
Background References
1. Park NJ. et. al. Compound K improves skin barrier function by increasing SPINK5 expression. J Ginseng Res. 2020 Nov
2. Lv Z. et. al. A Novel Tumor Suppressor SPINK5 Serves as an Independent Prognostic Predictor for Patients with Head and Neck Squamous Cell Carcinoma. Cancer Manag Res. 2020 Jun
Lymphoepithelial Kazal type related inhibitor antibody
NETS antibody
NS antibody
Serine peptidase inhibitor Kazal type 5 antibody
SPINK5 antibody
VAKTI antibody
Images
Western blot analysis of SPINK5 / LEKTI on different lysates with Rabbit anti-SPINK5 / LEKTI antibody (HA721027) at 1/1,000 dilution.
Lane 1: HeLa cell lysate (20 µg/Lane) Lane 2: Mouse heart tissue lysate (40 µg/Lane) Lane 3: Rat heart tissue lysate (40 µg/Lane)
Predicted band size: 121 kDa Observed band size: 121 kDa
Exposure time: 51 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA721027) at 1/1,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
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