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Formation of tonofilament bundles
Stable Identifier
R-HSA-6806629
Type
Reaction [transition]
Species
Homo sapiens
Compartment
cytosol
ReviewStatus
5/5
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Developmental Biology (Homo sapiens)
Keratinization (Homo sapiens)
Formation of tonofilament bundles (Homo sapiens)
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Keratin filaments are packed into bundles of varying diameter, called tonofilament bundles. These are the building blocks of the cytoskeleton in epithelial cells. Each bundle is surrounded by polyribosomes and multivesicular or folded membrane complexes that form a branched, tubular network (Norlen et al. 2003). In the stratum corneum, keratin bundles are thought to pack in a cubic rod pattern (Norlen & Al-Amoudi 2004). In living cells, X-ray diffraction studies of keratin intermediate filaments indicate a filament radius of 5 nm, hexagonal geometric arrangement with an interfilament distance of 14 nm and bundle diameters of 70 nm (Hémonnot et al. 2016).
Keratin filaments can rapidly disassemble and reassemble, allowing flexibility for the cytoskeleton. Keratin building blocks accumulate at the cell periphery near focal adhesions. Polymerization is regulated by signaling molecules, e.g. heat shock proteins, 14-3-3 proteins, kinases and phosphatases (Magin et al. 2007, Kayser et al. 2003).
Literature References
PubMed ID
Title
Journal
Year
15373777
Stratum corneum keratin structure, function, and formation: the cubic rod-packing and membrane templating model
Al-Amoudi, A
,
Norlén, L
J. Invest. Dermatol.
2004
Participants
Input
Keratin filament [cytosol]
(Homo sapiens)
Output
Keratin tonofilament [cytosol]
(Homo sapiens)
Participates
as an event of
Keratinization (Homo sapiens)
Orthologous Events
Formation of tonofilament bundles (Bos taurus)
Formation of tonofilament bundles (Canis familiaris)
Formation of tonofilament bundles (Danio rerio)
Formation of tonofilament bundles (Gallus gallus)
Formation of tonofilament bundles (Mus musculus)
Formation of tonofilament bundles (Rattus norvegicus)
Formation of tonofilament bundles (Sus scrofa)
Formation of tonofilament bundles (Xenopus tropicalis)
Authored
Jupe, S (2016-03-10)
Reviewed
Blumenberg, M (2016-08-12)
Created
Jupe, S (2015-10-23)
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