|Application ||WB, IHC|
|Calculated MW||44106 Da|
|Other Names||Keratin, type I cytoskeletal 19, Cytokeratin-19, CK-19, Keratin-19, K19, KRT19|
|Target/Specificity||A synthetic peptide corresponding to residues near the N-terminus of human CK-19 was used as an immunogen.|
|Format||50 mM Tris-Glycine (pH 7.4), 0.15 M NaCl, 40% Glycerol, 0.01% sodium azide and 0.05% BSA.|
|Storage||Maintain refrigerated at 2-8°C for up to 6 months. For long term storage store at -20°C in small aliquots to prevent freeze-thaw cycles.|
|Precautions||Cytokeratin-19 Antibody is for research use only and not for use in diagnostic or therapeutic procedures.|
|Function||Involved in the organization of myofibers. Together with KRT8, helps to link the contractile apparatus to dystrophin at the costameres of striated muscle.|
|Tissue Location||Expressed in a defined zone of basal keratinocytes in the deep outer root sheath of hair follicles Also observed in sweat gland and mammary gland ductal and secretory cells, bile ducts, gastrointestinal tract, bladder urothelium, oral epithelia, esophagus, ectocervical epithelium (at protein level). Expressed in epidermal basal cells, in nipple epidermis and a defined region of the hair follicle. Also seen in a subset of vascular wall cells in both the veins and artery of human umbilical cord, and in umbilical cord vascular smooth muscle. Observed in muscle fibers accumulating in the costameres of myoplasm at the sarcolemma in structures that contain dystrophin and spectrin.|
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Cytokeratin polypeptide 19 (CK19) is a type I intermediate filament protein that is expressed in stratified and simple-type epithelia (1). Cytokeratins 8 and 19 concentrate at costameres of striated muscle and copurify with the dystrophin-glycoprotein complex, perhaps through the interaction of the cytokeratins with the actin-binding domain of dystrophin. Studies in COS-7 cells and in vitro showed that dystrophin binds directly and specifically to K19. Results show that dystrophin interacts through its actin-binding domain with CK19 specifically and are consistent with the idea that cytokeratins associate with dystrophin at the sarcolemma of striated muscle (2). CK19 is synthesized mainly in embryonic and adult simple epithelia, but has also been found in stratified epithelia as well. CK19 is the smallest known keratin and is remarkable in that, contrary to all other keratins, it does not have a designated partner for the formation of filaments, implying that regulation of its expression is different from other keratin-encoding genes (3).
1. Zhou X, et al. J Biol Chem 274(18):12861-6, 1999
2. Stone MR, et al. Mol Biol Cell 16(9):4280-93, 2005
3. Lussier M, et al. Gene 95(2):203-13, 1990
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