Anti-Kallikrein 5/KLK5 Antibody Picoband® Fluoro488 Conjugated

KLK5 (Kallikrein-related peptidase 5), formerly known as stratum corneum tryptic enzyme (SCTE) or KLKL2, is a serine protease expressed in the epidermis. The KLK5 gene is one of the fifteen kallikrein subfamily members which is located on 19q13.41. KLK5 has been suggested to regulate cell shedding in conjunction with KLK7 and KLK14, given its ability to degrade proteins which form the extracellular component of cell junctions in the stratum corneum. The KLK5 gene contains 5 coding exons spanning 9.3. KLK5 expression is upregulated in a breast cancer cell line in the presence of estrogens and progestins and is associated with more aggressive forms of epithelial ovarian carcinoma.

Isoform beta-3A and isoform beta-3C are widely expressed. Isoform beta-3A is specifically expressed in osteoblast cells; isoform beta-3C is specifically expressed in prostate and testis.

Cancer, Cell Biology, Cytoskeleton/ECM, ECM Enzymes, Extracellular Matrix, Invasion/Microenvironment, Proteolysis/Ubiquitin, Proteolytic Enzymes, Signal Transduction

Integrin alpha-V/beta-3 (ITGAV:ITGB3) is a receptor for cytotactin, fibronectin, laminin, matrix metalloproteinase-2, osteopontin, osteomodulin, prothrombin, thrombospondin, vitronectin and von Willebrand factor. Integrin alpha-IIb/beta-3 (ITGA2B:ITGB3) is a receptor for fibronectin, fibrinogen, plasminogen, prothrombin, thrombospondin and vitronectin. Integrins alpha-IIb/beta-3 and alpha-V/beta-3 recognize the sequence R-G-D in a wide array of ligands. Integrin alpha- IIb/beta-3 recognizes the sequence H-H-L-G-G-G-A-K-Q-A-G-D-V in fibrinogen gamma chain. Following activation integrin alpha- IIb/beta-3 brings about platelet/platelet interaction through binding of soluble fibrinogen. This step leads to rapid platelet aggregation which physically plugs ruptured endothelial surface. Fibrinogen binding enhances SELP expression in activated platelets (By similarity) . In case of HIV-1 infection, the interaction with extracellular viral Tat protein seems to enhance angiogenesis in Kaposi's sarcoma lesions. .

1. Brattsand, M., Egelrud, T. Purification, molecular cloning, and expression of a human stratum corneum trypsin-like serine protease with possible function in desquamation. J. Biol. Chem. 274: 30033-30040, 1999. 2. Elliott, M. B., Irwin, D. M., Diamandis, E. P. In silico identification and Bayesian phylogenetic analysis of multiple new mammalian kallikrein gene families. Genomics 88: 591-599, 2006. 3. Gan, L., Lee, I., Smith, R., Argonza-Barrett, R., Lei, H., McCuaig, J., Moss, P., Paeper, B., Wang, K. Sequencing and expression analysis of the serine protease gene cluster located in chromosome 19q13 region. Gene 257: 119-130, 2000.