Anti-Cytokeratin 20/Krt20 Antibody Picoband® Fluoro488 Conjugated

Keratin 20, often abbreviated CK20, is a protein that in humans is encoded by the KRT20 gene. This gene encodes a member of the keratin protein family and is found within a cluster of cytokeratin genes on chromosome 11. Keratins are cytoskeletal proteins that are preferentially expressed in epithelial cells. The encoded protein may help maintain intermediate filament organization in intestinal epithelium. Phosphorylation of this protein may also influence mucin secretion in the small intestine.

Expressed at low levels in the more differentiated suprabasal regions of the small intestine, and at higher levels in the colon, mainly in the upper region and in scattered cells throughout the remaining epithelium. Also expressed in epithelial cells of bladder, ileum and stomach and at lower levels in pancreas and earskin. The phosphorylated form is nearly exclusively expressed in goblet cells of the small intestine and in the lumen-proximal cells of the colon (at protein level) . Also expressed in jejunum and duodenum.

Cell Biology, Co-Activators/Co-Repressors, Epigenetics and Nuclear Signaling, Nuclear Receptors, Nuclear Signaling Pathways, Proteasome / Ubiquitin, Proteolysis/Ubiquitin, Transcription, Transcription Factors, Ubiquitin & Ubiquitin Like Modifiers

Plays a significant role in maintaining keratin filament organization in intestinal epithelia. When phosphorylated, plays a role in the secretion of mucin in the small intestine.

1. Calnek, D., Quaroni, A. Differential localization by in situ hybridization of distinct keratin mRNA species during intestinal epithelial cell development and differentiation. Differentiation 53: 95-104, 1993. 2. Moll, R., Schiller, D. L., Franke, W. W. Identification of protein IT of the intestinal cytoskeleton as a novel type I cytokeratin with unusual properties and expression patterns. J. Cell Biol. 111: 567-580, 1990. 3. Rogers, M. A., Langbein, L., Winter, H., Ehmann, C., Praetzel, S., Korn, B., Schweizer, J. Characterization of a cluster of human high/ultrahigh sulfur keratin-associated protein genes embedded in the type I keratin gene domain on chromosome 17q12-21. J. Biol. Chem. 276: 19440-19451, 2001.