NDLI: Differential extraction of keratin subunits and filaments from normal human epidermis.

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Differential extraction of keratin subunits and filaments from normal human epidermis.

Content Provider	Scilit
Author	Eichner, R. Kahn, M.
Copyright Year	1990
Description	Journal: Journal of Cell Biology We have investigated keratin interactions in vivo by sequentially extracting water-insoluble proteins from normal human epidermis with increasing concentrations of urea (2, 4, 6, and 9.5 M) and examining each extract by one- and two-dimensional gel electrophoresis, immunoblot analysis using monoclonal anti-keratin antibodies, and EM. The viable layers of normal human epidermis contain keratins K1, K2, K5, K10/11, K14, and K15, which are sequentially expressed during the course of epidermal differentiation. Only keratins K5, K14, and K15, which are synthesized by epidermal basal cells, were solubilized in 2 M urea. Extraction of keratins K1, K2, and K10/11, which are expressed only in differentiating suprabasal cells, required 4-6 M urea. Negative staining of the 2-M urea extract revealed predominantly keratin filament subunits, whereas abundant intermediate-sized filaments were observed in the 4-urea and 6-M urea extracts. These results indicate that in normal human epidermis, keratins K5, K14, and K15 are more soluble than the differentiation-specific keratins K1, K2, and K10/11. This finding suggests that native keratin filaments of different polypeptide composition have differing properties, despite their similar morphology. Furthermore, the observation of stable filaments in 4 and 6 M urea suggests that epidermal keratins K1, K2, and K10/11, which ultimately form the bulk of the protective, nonviable stratum corneum, may comprise filaments that are unusually resistant to denaturation.
Related Links	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2116084/pdf
ISSN	00221295
DOI	10.1083/jcb.110.4.1149
Journal	Journal of Cell Biology
Issue Number	4
Volume Number	110
Language	English
Publisher	Rockefeller University Press
Publisher Date	1990-04-01
Access Restriction	Open
Subject Keyword	Journal: Journal of Cell Biology Biochemistry and Molecular Biology Differentiation Normal Human Human Epidermis Keratins K1
Content Type	Text
Resource Type	Article
Subject	Physiology

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