Abstract
We have determined the sequence of cloned cDNAs derived from a 1,665-nucleotide mRNA which transiently accumulates during Xenopus laevis embryogenesis. Computer analysis of the deduced amino acid sequence revealed that this mRNA encodes a 47-kilodalton type I intermediate filament subunit, i.e., a cytokeratin. As is common to all intermediate filament subunits so far examined, the predicted polypeptide, named XK70, contains N- and C-terminal domains flanking a central alpha-helical rod domain. The overall amino acid homology between XK70 and a human 50-kilodalton type I keratin is 47%; homology within the alpha-helical domain is 57%. The N-terminal domain, which is not completely contained in our cDNAs, is basic, contains 42% serine plus alanine, and includes five copies of a six-amino-acid repeating unit. The C-terminal domain has a high alpha-helical content and contains a region with sequence homology to the C-terminal domains of other type I and type III intermediate filament proteins. We suggest that different keratin filament subtypes may have different functional roles during amphibian oogenesis and embryogenesis.
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- Bailey J. M., Davidson N. Methylmercury as a reversible denaturing agent for agarose gel electrophoresis. Anal Biochem. 1976 Jan;70(1):75–85. doi: 10.1016/s0003-2697(76)80049-8. [DOI] [PubMed] [Google Scholar]
- Banks-Schlegel S. P. Keratin alterations during embryonic epidermal differentiation: a presage of adult epidermal maturation. J Cell Biol. 1982 Jun;93(3):551–559. doi: 10.1083/jcb.93.3.551. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Brosius J., Dull T. J., Sleeter D. D., Noller H. F. Gene organization and primary structure of a ribosomal RNA operon from Escherichia coli. J Mol Biol. 1981 May 15;148(2):107–127. doi: 10.1016/0022-2836(81)90508-8. [DOI] [PubMed] [Google Scholar]
- Chou P. Y., Fasman G. D. Conformational parameters for amino acids in helical, beta-sheet, and random coil regions calculated from proteins. Biochemistry. 1974 Jan 15;13(2):211–222. doi: 10.1021/bi00699a001. [DOI] [PubMed] [Google Scholar]
- Chou P. Y., Fasman G. D. Prediction of protein conformation. Biochemistry. 1974 Jan 15;13(2):222–245. doi: 10.1021/bi00699a002. [DOI] [PubMed] [Google Scholar]
- Church G. M., Gilbert W. Genomic sequencing. Proc Natl Acad Sci U S A. 1984 Apr;81(7):1991–1995. doi: 10.1073/pnas.81.7.1991. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Fitzgerald M., Shenk T. The sequence 5'-AAUAAA-3'forms parts of the recognition site for polyadenylation of late SV40 mRNAs. Cell. 1981 Apr;24(1):251–260. doi: 10.1016/0092-8674(81)90521-3. [DOI] [PubMed] [Google Scholar]
- Franz J. K., Gall L., Williams M. A., Picheral B., Franke W. W. Intermediate-size filaments in a germ cell: Expression of cytokeratins in oocytes and eggs of the frog Xenopus. Proc Natl Acad Sci U S A. 1983 Oct;80(20):6254–6258. doi: 10.1073/pnas.80.20.6254. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Garnier J., Osguthorpe D. J., Robson B. Analysis of the accuracy and implications of simple methods for predicting the secondary structure of globular proteins. J Mol Biol. 1978 Mar 25;120(1):97–120. doi: 10.1016/0022-2836(78)90297-8. [DOI] [PubMed] [Google Scholar]
- Geisler N., Kaufmann E., Weber K. Proteinchemical characterization of three structurally distinct domains along the protofilament unit of desmin 10 nm filaments. Cell. 1982 Aug;30(1):277–286. doi: 10.1016/0092-8674(82)90033-2. [DOI] [PubMed] [Google Scholar]
- Geisler N., Weber K. Comparison of the proteins of two immunologically distinct intermediate-sized filaments by amino acid sequence analysis: desmin and vimentin. Proc Natl Acad Sci U S A. 1981 Jul;78(7):4120–4123. doi: 10.1073/pnas.78.7.4120. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Geisler N., Weber K. The amino acid sequence of chicken muscle desmin provides a common structural model for intermediate filament proteins. EMBO J. 1982;1(12):1649–1656. doi: 10.1002/j.1460-2075.1982.tb01368.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Gibbs A. J., McIntyre G. A. The diagram, a method for comparing sequences. Its use with amino acid and nucleotide sequences. Eur J Biochem. 1970 Sep;16(1):1–11. doi: 10.1111/j.1432-1033.1970.tb01046.x. [DOI] [PubMed] [Google Scholar]
- Godsave S. F., Wylie C. C., Lane E. B., Anderton B. H. Intermediate filaments in the Xenopus oocyte: the appearance and distribution of cytokeratin-containing filaments. J Embryol Exp Morphol. 1984 Oct;83:157–167. [PubMed] [Google Scholar]
- Hanukoglu I., Fuchs E. The cDNA sequence of a Type II cytoskeletal keratin reveals constant and variable structural domains among keratins. Cell. 1983 Jul;33(3):915–924. doi: 10.1016/0092-8674(83)90034-x. [DOI] [PubMed] [Google Scholar]
- Hanukoglu I., Fuchs E. The cDNA sequence of a human epidermal keratin: divergence of sequence but conservation of structure among intermediate filament proteins. Cell. 1982 Nov;31(1):243–252. doi: 10.1016/0092-8674(82)90424-x. [DOI] [PubMed] [Google Scholar]
- Hoffmann W., Franz J. K. Amino acid sequence of the carboxy-terminal part of an acidic type I cytokeratin of molecular weight 51 000 from Xenopus laevis epidermis as predicted from the cDNA sequence. EMBO J. 1984 Jun;3(6):1301–1306. doi: 10.1002/j.1460-2075.1984.tb01966.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Johnson L. D., Idler W. W., Zhou X. M., Roop D. R., Steinert P. M. Structure of a gene for the human epidermal 67-kDa keratin. Proc Natl Acad Sci U S A. 1985 Apr;82(7):1896–1900. doi: 10.1073/pnas.82.7.1896. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Jorcano J. L., Magin T. M., Franke W. W. Cell type-specific expression of bovine keratin genes as demonstrated by the use of complementary DNA clones. J Mol Biol. 1984 Jun 15;176(1):21–37. doi: 10.1016/0022-2836(84)90380-2. [DOI] [PubMed] [Google Scholar]
- Jorcano J. L., Rieger M., Franz J. K., Schiller D. L., Moll R., Franke W. W. Identification of two types of keratin polypeptides within the acidic cytokeratin subfamily I. J Mol Biol. 1984 Oct 25;179(2):257–281. doi: 10.1016/0022-2836(84)90468-6. [DOI] [PubMed] [Google Scholar]
- Kim K. H., Rheinwald J. G., Fuchs E. V. Tissue specificity of epithelial keratins: differential expression of mRNAs from two multigene families. Mol Cell Biol. 1983 Apr;3(4):495–502. doi: 10.1128/mcb.3.4.495. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lazarides E. Intermediate filaments: a chemically heterogeneous, developmentally regulated class of proteins. Annu Rev Biochem. 1982;51:219–250. doi: 10.1146/annurev.bi.51.070182.001251. [DOI] [PubMed] [Google Scholar]
- Lewis S. A., Balcarek J. M., Krek V., Shelanski M., Cowan N. J. Sequence of a cDNA clone encoding mouse glial fibrillary acidic protein: structural conservation of intermediate filaments. Proc Natl Acad Sci U S A. 1984 May;81(9):2743–2746. doi: 10.1073/pnas.81.9.2743. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lipman D. J., Pearson W. R. Rapid and sensitive protein similarity searches. Science. 1985 Mar 22;227(4693):1435–1441. doi: 10.1126/science.2983426. [DOI] [PubMed] [Google Scholar]
- Marchuk D., McCrohon S., Fuchs E. Complete sequence of a gene encoding a human type I keratin: sequences homologous to enhancer elements in the regulatory region of the gene. Proc Natl Acad Sci U S A. 1985 Mar;82(6):1609–1613. doi: 10.1073/pnas.82.6.1609. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Marchuk D., McCrohon S., Fuchs E. Remarkable conservation of structure among intermediate filament genes. Cell. 1984 Dec;39(3 Pt 2):491–498. doi: 10.1016/0092-8674(84)90456-2. [DOI] [PubMed] [Google Scholar]
- Maxam A. M., Gilbert W. Sequencing end-labeled DNA with base-specific chemical cleavages. Methods Enzymol. 1980;65(1):499–560. doi: 10.1016/s0076-6879(80)65059-9. [DOI] [PubMed] [Google Scholar]
- McLachlan A. D., Stewart M. The 14-fold periodicity in alpha-tropomyosin and the interaction with actin. J Mol Biol. 1976 May 15;103(2):271–298. doi: 10.1016/0022-2836(76)90313-2. [DOI] [PubMed] [Google Scholar]
- Moll R., Franke W. W., Schiller D. L., Geiger B., Krepler R. The catalog of human cytokeratins: patterns of expression in normal epithelia, tumors and cultured cells. Cell. 1982 Nov;31(1):11–24. doi: 10.1016/0092-8674(82)90400-7. [DOI] [PubMed] [Google Scholar]
- Moll R., Moll I., Wiest W. Changes in the pattern of cytokeratin polypeptides in epidermis and hair follicles during skin development in human fetuses. Differentiation. 1982;23(2):170–178. doi: 10.1111/j.1432-0436.1982.tb01280.x. [DOI] [PubMed] [Google Scholar]
- Mount S. M. A catalogue of splice junction sequences. Nucleic Acids Res. 1982 Jan 22;10(2):459–472. doi: 10.1093/nar/10.2.459. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Nelson W. J., Traub P. Proteolysis of vimentin and desmin by the Ca2+-activated proteinase specific for these intermediate filament proteins. Mol Cell Biol. 1983 Jun;3(6):1146–1156. doi: 10.1128/mcb.3.6.1146. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Okayama H., Berg P. A cDNA cloning vector that permits expression of cDNA inserts in mammalian cells. Mol Cell Biol. 1983 Feb;3(2):280–289. doi: 10.1128/mcb.3.2.280. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Parry D. A. Analysis of the primary sequence of alpha-tropomyosin from rabbit skeletal muscle. J Mol Biol. 1975 Nov 5;98(3):519–535. doi: 10.1016/s0022-2836(75)80084-2. [DOI] [PubMed] [Google Scholar]
- Parry D. A., Crewther W. G., Fraser R. D., MacRae T. P. Structure of alpha-keratin: structural implication of the amino acid sequences of the type I and type II chain segments. J Mol Biol. 1977 Jun 25;113(2):449–454. doi: 10.1016/0022-2836(77)90153-x. [DOI] [PubMed] [Google Scholar]
- Proudfoot N. J., Brownlee G. G. 3' non-coding region sequences in eukaryotic messenger RNA. Nature. 1976 Sep 16;263(5574):211–214. doi: 10.1038/263211a0. [DOI] [PubMed] [Google Scholar]
- Quax-Jeuken Y. E., Quax W. J., Bloemendal H. Primary and secondary structure of hamster vimentin predicted from the nucleotide sequence. Proc Natl Acad Sci U S A. 1983 Jun;80(12):3548–3552. doi: 10.1073/pnas.80.12.3548. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Quax W., van den Heuvel R., Egberts W. V., Quax-Jeuken Y., Bloemendal H. Intermediate filament cDNAs from BHK-21 cells: demonstration of distinct genes for desmin and vimentin in all vertebrate classes. Proc Natl Acad Sci U S A. 1984 Oct;81(19):5970–5974. doi: 10.1073/pnas.81.19.5970. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sagata N., Shiokawa K., Yamana K. A study on the steady-state population of poly(A)+RNA during early development of Xenopus laevis. Dev Biol. 1980 Jun 15;77(2):431–448. doi: 10.1016/0012-1606(80)90486-8. [DOI] [PubMed] [Google Scholar]
- Salim M., Maden B. E. Nucleotide sequence of Xenopus laevis 18S ribosomal RNA inferred from gene sequence. Nature. 1981 May 21;291(5812):205–208. doi: 10.1038/291205a0. [DOI] [PubMed] [Google Scholar]
- Sargent T. D., Dawid I. B. Differential gene expression in the gastrula of Xenopus laevis. Science. 1983 Oct 14;222(4620):135–139. doi: 10.1126/science.6688681. [DOI] [PubMed] [Google Scholar]
- Slack J. M. Regional biosynthetic markers in the early amphibian embryo. J Embryol Exp Morphol. 1984 Apr;80:289–319. [PubMed] [Google Scholar]
- Steinert P. M., Parry D. A., Racoosin E. L., Idler W. W., Steven A. C., Trus B. L., Roop D. R. The complete cDNA and deduced amino acid sequence of a type II mouse epidermal keratin of 60,000 Da: analysis of sequence differences between type I and type II keratins. Proc Natl Acad Sci U S A. 1984 Sep;81(18):5709–5713. doi: 10.1073/pnas.81.18.5709. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Steinert P. M., Rice R. H., Roop D. R., Trus B. L., Steven A. C. Complete amino acid sequence of a mouse epidermal keratin subunit and implications for the structure of intermediate filaments. Nature. 1983 Apr 28;302(5911):794–800. doi: 10.1038/302794a0. [DOI] [PubMed] [Google Scholar]
- Steinert P. M. Structure of the three-chain unit of the bovine epidermal keratin filament. J Mol Biol. 1978 Jul 25;123(1):49–70. doi: 10.1016/0022-2836(78)90376-5. [DOI] [PubMed] [Google Scholar]