产品标准
浓缩液(1mg/1ml) 亲和纯化抗体
产品应用
WB=1:100-500 Elisa =1:200-1000 IP=1:20-100 IHC=1:100-500 （石蜡切片需做抗原修复）
产品介绍
KLK4目前认为是前列腺癌等其他肿瘤很有意义的标志物。激肽释放酶KLK是激肽系统的主要限速酶，它是一组存在于多数组织和体液中的丝氨酸蛋白酶，是一种肽链内切酶。KLK又称血管舒缓素，包括15个家族成员。在不同的组织中广泛表达,具有蛋白水解酶的活性。它特异性的在碳末端切割底物肽，可裂解激肽原释放具有活性的激肽，由激肽发挥对心血管系统及肾脏功能的调节作用。
组织KLK是一个大的基因家族，主要分布在肺、肾、血管、脑、肾上腺组织，为一种中等大小的糖蛋白。
Kallikreins are a subgroup of serine proteases having diverse physiological functions. Growing evidence suggests that many kallikreins are implicated in carcinogenesis and some have potential as novel cancer and other disease biomarkers. This gene is one of the fifteen kallikrein subfamily members located in a cluster on chromosome 19. In some tissues its expression is hormonally regulated. The expression pattern of a similar mouse protein in murine developing teeth supports a role for the protein in the degradation of enamel proteins. Alternate splice variants for this gene have been described, but their biological validity has not been determined.
The human tissue Kallikrein gene family encodes 15 serine proteases. All Kallikreins share structural similarities including cysteine residues, a catalytic triad of His, Asp, and Ser residues, typically five coding exons and varied intron phases. Kallikreins are predominantly secreted as inactive zymogens prior to activation by cleavage of an N terminal peptide and all function extracellularly. Kallikreins can be activated autocatalytically, via other Kallikreins, or additional proteases. While structurally similar, Kallikrein family members have distinct functions and have key roles in many physiological and pathological processes. Many human tissue Kallikreins also show promise as cancer biomarkers, which may facilitate earlier detection and characterization of many forms of cancer.
Kallikrein 4 (hK4) was first described as enamel matrix serine proteinase 1, a serine protease involved in degradation of amelogenin during tooth development and tooth enamel turnover. Unlike another enamel processing enzyme, MMP20, hK4 is not restricted to dental tissues and has been identified in a range of normal and cancerous tissues and cell lines. Androgen response elements have been identified in hK4 genes and the hK4 levels have been shown to be modified by androgens and estrogens, similar to hK3 (PSA). hK4 has also been shown to activate pro-uPa by generating the two chain form after cleavage of the one chain form and thus may participate in an enzyme activation cascade. The Kallikrein 4 signal sequence is thought to be insufficient to allow secretion of hK4 and several reports indicate a predominately nuclear isolation.
The hK4 structure differs from the Kallikrein 1-3 in having a shorter "kallikrein loop", the sequence thought to impart specificity to the classical kallikreins. Endogenous inhibitors include kallistatin, protein C inhibitor and alpha 1 proteinase inhibitor, although hK4 can be found complexed to a number of different proteinase inhibitors.
mol wt:28kDa
Other Aliases:
Kallikrein 4; kallikrein-related peptidase 4 preproprotein; AI2A1; ARM1; EMSP; EMSP1; KLK-L1; MGC116827; MGC116828; PROSTASE; PRSS17; PSTS
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