Type I keratin

Type I keratins (or Type I cytokeratins) are cytokeratins that constitute the Type I intermediate filaments (IFs) of the intracytoplasmatic cytoskeleton, which is present in all mammalian epithelial cells. Most of the type I keratins 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 keratins are encoded on chromosome 17q and encompasses: K9, K10, K11, K12, K13, K14, K15, K16, K17, K18, K19 and K20. Their molecular weight ranges from 40 kDa (K19) to 64 kDa (K9).

External links

Type I Keratin at the US National Library of Medicine Medical Subject Headings (MeSH)
Proteopedia page on keratins

Proteins of the cytoskeleton

Human

Microfilaments
and ABPs

Myofilament

Actins	A1 A2 B C1 G1 G2

Myosins	I MYO1A MYO1B MYO1C MYO1D MYO1E MYO1F MYO1G MYO1H) II MYH1 MYH2 MYH3 MYH4 MYH6 MYH7 MYH7B MYH8 MYH9 MYH10 MYH11 MYH13 MYH14 MYH15 MYH16 III MYO3A MYO3B V MYO5A MYO5B MYO5C VI MYO6 VII MYO7A MYO7B IX MYO9A MYO9B X MYO10 XV MYO15A XVIII MYO18A MYO18B LC MYL1 MYL2 MYL3 MYL4 MYL5 MYL6 MYL6B MYL7 MYL9 MYLIP MYLK MYLK2 MYLL1

Other	Tropomodulin 1 2 3 4 Troponin T 1 2 3 C 1 2 I 1 2 3 Tropomyosin 1 2 3 4 Actinin 1 2 3 4 Arp2/3 complex actin depolymerizing factors Cofilin 1 2 Destrin Gelsolin Profilin 1 2 Titin

Other

Intermediate
filaments

Type 1/2
(Keratin,
Cytokeratin)

Epithelial keratins (soft alpha-keratins)	type I/chromosome 17 10 12 13 14 15 16 17 19 20 chromosome 12 18 none 21 type II/chromosome 12 1 2A 3 4 5 6A 6B 7 8 9

Hair keratins (hard alpha-keratins)	type I/chromosome 17 31 32 33A 33B 34 35 36 37 38 type II/chromosome 12 81 82 83 84 85 86

Ungrouped alpha	chromosome 17 23 24 25 26 27 28 39 40 chromosome 12 71 72 73 74 75 76 77 78 79 80

Not alpha	Beta-keratin

Type 3

Type 4

Type 5

Microtubules
and MAPs

Kinesins	KIF1A KIF1B KIF2A KIF2C KIF3B KIF3C KIF4A KIF4B KIF5A KIF5B KIF5C KIF6 KIF7 KIF9 KIF11 KIF12 KIF13A KIF13B KIF14 KIF15 KIF16B KIF17 KIF18A KIF18B KIF19 KIF20A KIF20B KIF21A KIF21B KIF22 KIF23 KIF24 KIF25 KIF26A KIF26B KIF27 KIFC1 KIFC2 KIFC3

Dyneins	axonemal: DNAH1 DNAH2 DNAH3 DNAH5 DNAH6 DNAH7 DNAH8 DNAH9 DNAH10 DNAH11 DNAH12 DNAH13 DNAH14 DNAH17 DNAI1 DNAI2 DNALI1 DNAL1 DNAL4 cytoplasmic: DYNC1H1 DYNC2H1 DYNC1I1 DYNC1I2 DYNC1LI1 DYNC1LI2 DYNC2LI1 DYNLL1 DYNLL2 DYNLRB1 DYNLRB2 DYNLT1 DYNLT3

Other	Tau protein Dynactin DCTN1 Tubulins TUBA1A TUBA1B TUBA1C TUBA3C TUBA3D TUBA3E TUBA4A TUBA8 Stathmin Tektin TEKT1 TEKT2 TEKT3 TEKT4 TEKT5 Dynamin DNM1 DNM2 DNM3

Catenins

Membrane

Dystrophin
- Dystroglycan
Utrophin
Ankyrin
- ANK1
- ANK2
- ANK3
Spectrin
- SPTA1
- SPTAN1
- SPTB
- SPTBN1
- SPTBN2
- SPTBN4
- SPTBN5

Other

Plakins
- Corneodesmosin
- Desmoplakin
- Dystonin
- Envoplakin
- MACF1
- Periplakin
- Plectin
Talin
- TLN1
Vinculin
Plakophilin
- PKP1
- PKP2

Nonhuman

See also: cytoskeletal defects

Protein: scleroproteins

Extracellular matrix

Collagen

Fibril forming	type I COL1A1 COL1A2 type II (COL2A1) type III type V COL5A1 COL5A2 COL5A3 COL24A1 COL26A1

Other	FACIT: type IX COL9A1 COL9A2 COL9A3 type XII (COL12A1) COL14A1 COL16A1 COL19A1 COL20A1 COL21A1 COL22A1 basement membrane: type IV COL4A1 COL4A2 COL4A3 COL4A4 COL4A5 COL4A6 multiplexin: COL15A1 type XVIII COL18A1 Endostatin transmembrane: COL13A1 COL17A1 COL23A1 COL25A1 other: type VI COL6A1 COL6A2 COL6A3 COL6A5 type VII (COL7A1) type VIII COL8A1 COL8A2 type X (COL10A1) type XI COL11A1 COL11A2 COL27A1 COL28A1

Enzymes	Prolyl hydroxylase/Lysyl hydroxylase Cartilage associated protein/Leprecan ADAMTS2 Procollagen peptidase Lysyl oxidase

Laminin

alpha
- LAMA1
- LAMA2
- LAMA3
- LAMA4
- LAMA5
beta
- LAMB1
- LAMB2
- LAMB3
- LAMB4
gamma
- LAMC1
- LAMC2
- LAMC3

Other

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