Molecular chaperone essential for the assembly of standard proteasomes and immunoproteasomes. Degraded after completion of proteasome maturation. Mediates the association of 20S preproteasome with the endoplasmic reticulum.
Strongly expressed from the basal layer to the granular layer of healthy epidermis, whereas in KLICK patients there is a gradual decrease of expression toward the granular layer.
Defects in POMP are the cause of keratosis linearis with ichthyosis congenita and sclerosing keratoderma (KLICK) [MIM:601952]. KLICK is a keratinizing disorder characterized by ichthyosis, palmoplantar keratoderma with constricting bands around fingers, flexural deformities of fingers and keratotic papules in a linear distribution on the flexural side of large joints. Histological examination of the skin of affected individuals shows hypertrophy and hyperplasia of the spinous, granular and horny epidermal layer.
Dahlqvist J et al. A single-nucleotide deletion in the POMP 5' UTR causes a transcriptional switch and altered epidermal proteasome distribution in KLICK genodermatosis. Am J Hum Genet86:596-603 (2010).
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