Type I cytokeratin
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Type I cytokeratins constitutes the Type I intermediate filaments (IFs) of the intracytoplasmatic cytoskeleton, which is present in all mammalian epithelial cells. Most of the type I cytokeratins consist of acidic, low molecular weight proteins which 'in vivo' are arranged in pairs of heterotypic Type I and Type II keratin chains, coexpressed during differentiation of simple and stratified epithelial tissues.
Type I cytokeratins are encoded on chromosome 17q and encompasses: CK9, CK10, CK11, CK12, CK13, CK14, CK15, CK16, CK17, CK18, CK19 and CK20. Their molecular weight ranges from 40 kDa (CK19) to 64 kDa (CK9).
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Microfilaments: Actins - Myosins - Actin-binding proteins
Intermediate filaments: type 1 and 2 Cytokeratin (type I, type II)
type 3 Desmin, GFAP, Peripherin, Vimentin
type 4 Internexin, Nestin, Neurofilament
type 5 Lamin (A, B)
Microtubules: Dyneins - Kinesins - MAPs (Tau protein) - Tubulins
Prokaryotic cytoskeleton: Crescentin - FtsZ - MreB
Other: Major Sperm Proteins
