Disease:Defects in KRT18 are a cause of cryptogenic cirrhosis [MIM:215600]. ,Function:Involved in the uptake of thrombin-antithrombin complexes by hepatic cells (By similarity) . When phosphorylated , plays a role in filament reorganization. Involved in the delivery of mutated CFTR to the plasma membrane. Together with KRT8 , is involved in interleukin-6 (IL-6) -mediated barrier protection. ,induction:By IL-6. ,miscellaneous:There are two types of cytoskeletal and microfibrillar keratin: I (acidic; 40-55 kDa) and II (neutral to basic; 56-70 kDa) . ,PTM:O-glycosylated at multiple sites; glycans consist of single N-acetylglucosamine residues. ,PTM:Phosphorylation at Ser-34 increases during mitosis. Hyperphosphorylated at Ser-53 in diseased cirrhosis liver. Phosphorylation increases by IL-6. ,PTM:Proteolytically cleaved by caspases during epithelial cell apoptosis. Cleavage occurs at Asp-238 by either caspase-3 , caspase-6 or caspase-7. ,similarity:Belongs to the intermediate filament family. ,subunit:Heterotetramer of two type I and two type II keratins. Keratin-18 associates with keratin-8. Interacts with the thrombin-antithrombin complex (By similarity) . Interacts with PNN , HCV core protein and mutated CFTR. Interacts with YWHAE , YWHAH and YWHAZ only when phosphorylated. Interacts with DNAJB6 , TCHP and TRADD. ,tissue specificity:Expressed in colon , placenta , liver and very weakly in exocervix. Increased expression observed in lymph nodes of breast carcinoma. ,
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