PTK1, a novel protein kinase required for proliferation of human melanocytes

Kazuhiko Ezoe, Seung Taek Lee, Kathleen M. Strunk, Richard A. Spritz

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


We have identified and characterized PTK1, a novel human non-receptor protein kinase. Partial PTK1 cDNA was initially isolated by RT-PCR from mRNA of normal human melanocytes. Northern blot hybridization detected a 3.8-kb PTK1 mRNA in all tissues and cell types studied. Nucleotide sequence analysis of a full-length PTK1 cDNA showed it to encode an 847-amino acid polypeptide with an amino-terminal SH3 domain, a kinase catalytic domain, a leucine zipper-like domain, and a carboxyl proline-rich domain. The PTK1 kinase domain contains motifs generally considered diagnostic of serine/threonine kinases but also contains amino acids highly conserved among the tyrosine kinases. This suggests that PTK1 is a serine/threonine kinase, but one very closely related to the tyrosine kinase superfamily. When normal human melanocytes were exposed to antisense PTK1 oligonucleotide, cell growth was inhibited, whereas a corresponding sense oligonucleotide had no inhibitory effect. These data indicate that PTK1 plays an important role in the proliferation of normal human melanocytes.

Original languageEnglish
Pages (from-to)935-938
Number of pages4
Issue number3
Publication statusPublished - 1994 Mar

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics
  • Cancer Research


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