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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Garrone, R. Exposito, J. Y. |
| Description | Author Affiliation: Exposito JY ( Institute of Biology and Chemistry of Proteins, Centre National de la Recherche Scientifique, Lyons, France.); |
| Abstract | We have characterized cDNA and genomic clones coding for a sponge collagen. The partial cDNA has an open reading frame encoding 547 amino acid residues. The conceptual translation product contains a probably incomplete triple-helical domain (307 amino acids) with one Gly-Xaa-Yaa-Zaa imperfection in the otherwise perfect Gly-Xaa-Yaa repeats and a carboxyl propeptide (240 amino acids) that includes 7 cysteine residues. Amino acid sequence comparisons indicate that this sponge collagen is homologous to vertebrate and sea urchin fibrillar collagens. Partial characterization of the corresponding gene reveals an intron-exon organization clearly related to the fibrillar collagen gene family. The exons coding for the triple-helical domain are 54 base pairs (bp) or multiples thereof, except for a 57-bp exon containing the Gly-Xaa-Yaa-Zaa coding sequence and for two unusual exons of 126 and 18 bp, respectively. This latter 18-bp exon marks the end of the triple-helical domain, contrary to the other known fibrillar collagen genes that contain exons coding for the junction between the triple-helical domain and the carboxyl propeptide. Compared to other fibrillar collagen genes, the introns are remarkably small. Hybridization to blotted RNAs established that the gene transcript is 4.9 kilobases. Together with previous results that showed the existence of a nonfibrillar collagen in the same species, these data demonstrate that at least two collagen gene families are represented in the most primitive metazoa. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 17 |
| Volume Number | 87 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1990-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Biological Evolution Collagen Genetics Genes Multigene Family Porifera Amino Acid Sequence Animals Cloning, Molecular DNA Molecular Sequence Data Restriction Mapping Sequence Homology, Nucleic Acid Comparative Study Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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