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Keratin, type II cytoskeletal 5

Function

Required for the formation of keratin intermediate filaments in the basal epidermis and maintenance of the skin barrier in response to mechanical stress (By similarity). Regulates the recruitment of Langerhans cells to the epidermis, potentially by modulation of the abundance of macrophage chemotactic cytokines, macrophage inflammatory cytokines and CTNND1 localization in keratinocytes (By similarity).

Involvement in disease

Epidermolysis bullosa simplex 2A, generalized severe

EBS2A

A form of epidermolysis bullosa simplex, a group of skin fragility disorders characterized by skin blistering due to cleavage within the basal layer of keratinocytes, and erosions caused by minor mechanical trauma. There is a broad spectrum of clinical severity ranging from minor blistering on the feet, to subtypes with extracutaneous involvement and a lethal outcome. EBS2A is an autosomal dominant, severe form characterized by extensive intraepidermal blistering from the time of birth with herpetiform marginal spreading and central healing. Oral mucosal involvement, nail dystrophy, onychogryposis, formation of milia, and palmoplantar hyperkeratosis are common features.

None

The disease is caused by variants affecting the gene represented in this entry.

Epidermolysis bullosa simplex 2B, generalized intermediate

EBS2B

A form of epidermolysis bullosa simplex, a group of skin fragility disorders characterized by skin blistering due to cleavage within the basal layer of keratinocytes, and erosions caused by minor mechanical trauma. There is a broad spectrum of clinical severity ranging from minor blistering on the feet, to subtypes with extracutaneous involvement and a lethal outcome. EBS2B is an autosomal dominant form characterized by generalized blistering manifesting at birth. The tendency to blistering diminishes in adolescence, when it may become localized to hands and feet.

None

The disease is caused by variants affecting the gene represented in this entry.

Epidermolysis bullosa simplex 2C, localized

EBS2C

A form of epidermolysis bullosa simplex, a group of skin fragility disorders characterized by skin blistering due to cleavage within the basal layer of keratinocytes, and erosions caused by minor mechanical trauma. There is a broad spectrum of clinical severity ranging from minor blistering on the feet, to subtypes with extracutaneous involvement and a lethal outcome. EBS2C is an autosomal dominant form with intraepidermal blistering mainly restricted to hands and feet beginning in infancy. Nails may be thick and dystrophic.

None

The disease is caused by variants affecting the gene represented in this entry.

Epidermolysis bullosa simplex 2D, generalized, intermediate or severe, autosomal recessive

EBS2D

A form of epidermolysis bullosa simplex, a group of skin fragility disorders characterized by skin blistering due to cleavage within the basal layer of keratinocytes, and erosions caused by minor mechanical trauma. There is a broad spectrum of clinical severity ranging from minor blistering on the feet, to subtypes with extracutaneous involvement and a lethal outcome. EBS2D is an autosomal recessive form characterized by widespread intraepidermal skin blistering and erosions from birth. Death may occur in the neonatal period.

None

The disease is caused by variants affecting the gene represented in this entry.

Epidermolysis bullosa simplex 2E, with migratory circinate erythema

EBS2E

A form of epidermolysis bullosa simplex, a group of skin fragility disorders characterized by skin blistering due to cleavage within the basal layer of keratinocytes, and erosions caused by minor mechanical trauma. There is a broad spectrum of clinical severity ranging from minor blistering on the feet, to subtypes with extracutaneous involvement and a lethal outcome. EBS2E is an autosomal dominant form in which multiple vesicles are present from birth onward and acquire over time a typical migratory circinate pattern on an erythematous background. Postinflammatory hyperpigmentation develops gradually and may have a mottled pattern.

None

The disease is caused by variants affecting the gene represented in this entry.

Epidermolysis bullosa simplex 2F, with mottled pigmentation

EBS2F

A form of epidermolysis bullosa simplex, a group of skin fragility disorders characterized by skin blistering due to cleavage within the basal layer of keratinocytes, and erosions caused by minor mechanical trauma. There is a broad spectrum of clinical severity ranging from minor blistering on the feet, to subtypes with extracutaneous involvement and a lethal outcome. EBS2F is an autosomal dominant form characterized by generalized skin blistering of intermediate severity beginning at birth, with mottled or reticulate pigmentation developing gradually. Focal keratoses of palms and soles and dystrophic, thickened nails develop over time.

None

The disease is caused by variants affecting the gene represented in this entry.

Dowling-Degos disease 1

DDD1

An autosomal dominant genodermatosis. Affected individuals develop a postpubertal reticulate hyperpigmentation that is progressive and disfiguring, and small hyperkeratotic dark brown papules that affect mainly the flexures and great skin folds. Patients usually show no abnormalities of the hair or nails.

None

The disease is caused by variants affecting the gene represented in this entry.

Post-translational modifications

Phosphorylated by CDK1, AURKB and Rho-kinase, phosphorylation is regulated by the cell cycle (By similarity). Thr-24 phosphorylation, mediated by CDK1, peaks during prometaphase or metaphase cells with phosphorylated filamentous structures evident throughout the cytoplasm during early mitosis (By similarity). CDK1 phosphorylates Thr-24 in mitotic cells at the site of injury (By similarity).

O-glycosylated.

Sequence similarities

Belongs to the intermediate filament family.

Tissue specificity

Expressed in corneal epithelium (at protein level) (PubMed:26758872). Expressed in keratinocytes (at protein level) (PubMed:20128788, PubMed:31302245).

Cellular localization

  • Cytoplasm

Alternative names

58 kDa cytokeratin, Cytokeratin-5, Keratin-5, Type-II keratin Kb5, CK-5, K5, KRT5

Target type

Proteins

Primary research area

Oncology

Molecular weight

62378Da

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