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Isolation of a cDNA encoding a tyrosine kinase expressed in murine skin
Author(s) -
Kawachi Y.,
Nakauchi H.,
Otsuka F.
Publication year - 1997
Publication title -
experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 96
eISSN - 1600-0625
pISSN - 0906-6705
DOI - 10.1111/j.1600-0625.1997.tb00161.x
Subject(s) - microbiology and biotechnology , biology , sh3 domain , complementary dna , tyrosine kinase , proto oncogene tyrosine protein kinase src , tyrosine , receptor tyrosine kinase , cdna library , lim domain , tyrosine phosphorylation , protein kinase domain , kinase , biochemistry , signal transduction , gene , zinc finger , transcription factor , mutant
Tyrosine phosphorylation is widely recognized as playing an important role in cell differentiation, proliferation and carcinogenesis. We used the polymerase chain reaction (PCR) method to identify protein tyrosine kinases that were expressed in the skin. Mixed oligonucleotide probes were used to amplify and screen neonatal murine skin mRNA for clones encoding amino acid contiguities, the conservation of which is characteristic of the protein tyrosine kinase family. When the PCR products were sequenced, a novel clone encoding protein tyrosine kinase, PTK70, was identified. A full‐length cDNA was isolated from a mouse thymus cDNA library. The nucleotide and deduced amino acid sequence showed that it featured src‐homology (SH) 2 domain, SH3 domain and kinase domain like other src family protein tyrosine kinases, but lacked the N‐terminal myristylation site and C‐terminal tyrosine residue. Although the mRNA of PTK70 was detected in various tissues ubiquitously, the degree of its expression differed among tissues. Murine skin is one in which PTK70 was expressed strongly, with its expression being much stronger in the epidermis and in the cell line derived from murine keratinocytes than in those from melanoma or fibroblast cell lines. These evidences suggest that PTK70 may be involved in proliferation or differentiation of keratinocytes in the skin.