Structure, expression and chromosomal mapping of TKT from man and mouse: a new subclass of receptor tyrosine kinases with a factor VIII-like domain.
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Karn T, Holtrich U, Brauninger A, Bohme B, Wolf G, Rubsamen-Waigmann H, Strebhardt K
Structure, expression and chromosomal mapping of TKT from man and mouse: a new subclass of receptor tyrosine kinases with a factor VIII-like domain.
Oncogene. 1993 Dec;8(12):3433-40.
- PubMed ID
- 8247548 [ View in PubMed]
- Abstract
Using a polymerase chain reaction-mediated approach we have characterized cDNAs from human and mouse origin representing a novel type of receptor protein tyrosine kinase (RTK). The deduced amino acid sequence (855 amino acids) of the longest open reading frame has a unique extracellular region encompassing a factor VIII-like domain, not previously described for RTKs. The most closely related RTKs are members of the neurotrophin receptors (TRK), which showed 47-49% homology with the kinase domain of the new RTK. Therefore, the new gene has been called TKT (Tyrosine-Kinase related to TRK). TKT orthologs from man and mouse were 98% similar. In both species a major transcript of 10 kb was found to be expressed at high levels in heart and lung. Low levels of this mRNA-species were detected in human brain, placenta, liver, skeletal muscle, kidney and in mouse brain and testis. Analysing human/mouse somatic cell hybrids we demonstrated that TKT segregates with human chromosome 1.