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| Content Provider | PubMed Central |
|---|---|
| Author | Steinert, P. M. Parry, D. A. Racoosin, E. L. Idler, W. W. Steven, A. C. Trus, B. L. Roop, D. R. |
| Abstract | We present the complete nucleotide and deduced amino acid sequences of a mouse epidermal keratin subunit of 60,000 Da. The keratin possesses a central alpha-helical domain of four tracts (termed 1A, 1B, 2A, and 2B) that can form coiled-coils, interspersed by short linker sequences, and has non-alpha-helical terminal domains. This pattern of secondary structure is emerging as common to all intermediate filament subunits. The alpha-helical sequences conform to the type II class of keratins. Accordingly, this is the first type II keratin for which complete sequence information is available, and thus it facilitates elucidation of the fundamental distinctions between type I and type II keratins. It has been observed that type I keratins are acidic and type II keratins are neutral--basic in charge. We suggest that the basis for this empirical correlation between type and charge resides in the respective net charges of the 1A and 2B tracts. Calculations on interchain interactions between charged residues in the alpha-helical domains indicate that this keratin prefers to participate in dimers according to an in-register parallel arrangement. The terminal domains of this keratin possess characteristic glycine-rich sequences, and the carboxyl-terminal domain is highly homologous to that of a human epidermal keratin of 56,000 Da. According to the hypothesis that end-domains are located on the periphery of keratin filaments, we conclude that the corresponding mouse and human keratins are closely related, both structurally and functionally. |
| Starting Page | 5709 |
| File Format | |
| ISSN | 10916490 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 81 |
| Language | English |
| Publisher Date | 1984-09-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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