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KRT5 : ウィキペディア英語版
Keratin 5

Keratin 5, also known as KRT5, K5, or CK5, is a protein that is encoded in humans by the ''KRT5'' gene. It dimerizes with keratin 14 and forms the intermediate filaments (IF) that make up the cytoskeleton of basal epithelial cells. This protein is involved in several diseases including epidermolysis bullosa simplex and breast and lung cancers.〔
== Structure ==

Keratin 5, like other members of the keratin family, is an intermediate filament protein. These polypeptides are characterized by a 310 residue central rod domain that consists of four alpha helix segments (helix 1A, 1B, 2A, and 2B) connected by three short linker regions (L1, L1-2, and L2).〔 The ends of the central rod domain, which are called the helix initiation motif (HIM) and the helix termination motif (HTM), are highly conserved. They are especially important for helix stabilization, heterodimer formation, and filament formation.〔Shinkuma, Satoru, et al. "A Novel Keratin 5 Mutation in an African Family with Epidermolysis Bullosa Simplex Indicates the Importance of the Amino Acid Located at the Boundary Site Between the H1 and Coil 1A Domains." Acta dermato-venereologica 93.5 (2013): 585-587.〕 Lying on either side of the central rod are variable, non-helical head and tail regions which protrude from the IF surface and provide specificity to different IF polypeptides.〔
IF central rods contain heptad repeats (repeating seven residue patterns) of hydrophobic resides that allow two different IF proteins to intertwine into a coiled-coil formation via hydrophobic interactions.〔 These heterodimers are formed between specific pairs of type I (acidic) and type II (basic) keratin. K5, a type II keratin, pairs with the type I keratin K14. The coiled-coil dimers undergo stepwise assembly and combine in an antiparallel manner, forming end-to-end interactions with other coiled-coils to form large 10 nm intermediate filaments.〔〔Bouameur, Jamal-Eddine, et al. "Interaction of plectin with keratins 5 and 14: dependence on several plectin domains and keratin quaternary structure." Journal of Investigative Dermatology 134.11 (2014): 2776-2783.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Keratin 5」の詳細全文を読む



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