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Keratin, type I cytoskeletal 18

Developmental stage

During embryogenesis, expressed in a complex spatial and temporal pattern in various embryonic epithelia. In 7.5 and 13.5 day old embryo, expressed in most endodermal epithelia, ectodermal and nascent mesodermal tissues. When the neural plate forms, expression begins in the cells of skin ectoderm, head process/notochord, periderm, whisker buds, choroid plexus and the epithelia of auditory duct and inner ear. High expression in the lining endodermal cells when the foregut and hindgut invaginations form. Expression in all three layers of the urothelium starts at day 15 in the embryo and is not visible after day 18. By day 11 and 12, the entire embryonic palatal epithelium shows expression as well as the nasal passages and the roof of the mouth; which disappears progresively from day 13 to 15.

Function

When phosphorylated, plays a role in filament reorganization. Involved in the delivery of mutated CFTR to the plasma membrane. Involved in the uptake of thrombin-antithrombin complexes by hepatic cells (By similarity). Together with KRT8, is involved in interleukin-6 (IL-6)-mediated barrier protection.

Post-translational modifications

Phosphorylation increases by IL-6.

Proteolytically cleaved by caspases during epithelial cell apoptosis. Cleavage occurs at Asp-231 by either caspase-3, caspas-6 or caspase-7.

O-GlcNAcylation increases solubility, and decreases stability by inducing proteasomal degradation.

Sequence similarities

Belongs to the intermediate filament family.

Tissue specificity

Expressed in endoderm, intestinal epithelial cells and in most extraembryonic tissues.

Cellular localization

  • Nucleus matrix
  • Cytoplasm
  • Perinuclear region
  • Nucleus
  • Nucleolus
  • Cytoplasm

Alternative names

Kerd, Krt1-18, Krt18, Cytokeratin endo B, Cytokeratin-18, Keratin-18, Keratin D, CK-18, K18

Target type

Proteins

Primary research area

Oncology

Molecular weight

47538Da

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