期刊
EUROPEAN JOURNAL OF CELL BIOLOGY
卷 84, 期 2-3, 页码 363-377出版社
ELSEVIER GMBH
DOI: 10.1016/j.ejcb.2004.12.006
关键词
intermediate filaments; keratin; lungfish; human; evolution; vertebrata
类别
Lungfishes are possibly the closest extant relatives of the land vertebrates (tetrapods). We report here the cDNA and predicted amino acid sequences of 13 different keratins (ten type I and three type II) of the lungfish Protopterus aethiopicus. These keratins include the orthologs of human K8 and K18. The lungfish keratins were also identified in tissue extracts using two-dimensional polyacrylamide gel electrophoresis, keratin blot binding assays and immunoblotting. The identified keratin spots were analyzed by peptide mass fingerprinting which assigned seven sequences (inclusively Protopterus K8 and K18) to their respective protein spot. The peptide mass fingerprints also revealed the fact that the major epidermal type I and type II keratins of this lungfish have not yet been sequenced. Nevertheless, phylogenetic trees constructed from multiple sequence alignments of keratins from lungfish and distantly related vertebrates such as lamprey, shark, trout, frog, and human reveal new insights into the evolution of K8 and K18. and unravel a variety of independent keratin radiation events. (c) 2004 Elsevier GmbH. All rights reserved.
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