Molecular cloning and characterization of TPP36 and its isoform TPP32, novel substrates of Abl tyrosine kinase

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Abstract

We have molecularly cloned TPP36, a novel 36 kDa protein with 281 amino acids that was identified as a protein phosphorylated in B progenitor cells following stimulation with pervanadate/H2O2. Analysis with anti-TPP36 antiserum revealed that TPP36 was expressed ubiquitously and had an isoform with 236 amino acids, designated TPP32. TPP36/32 were localized mainly in cytoplasm despite the presence of a typical nuclear localization signal sequence. These proteins were phosphorylated preferentially by Abl among a panel of tyrosine kinases examined. Phosphorylation of tyrosine 120 in TPP36/32 led to an apparent mobility shift in sodium dodecyl sulfate-polyacrylamide gel electrophoresis, suggesting conformational change in the phosphorylated protein. Thus, TPP36/32 appear to be novel substrates of Abl tyrosine kinase. © 2003 Published by Elsevier Science B.V. on behalf of the Federation of European Biochemical Societies.

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Tsuchiya, K., Kawano, Y., Kojima, T., Nagata, K., Takao, T., Okada, M., … Karasuyama, H. (2003). Molecular cloning and characterization of TPP36 and its isoform TPP32, novel substrates of Abl tyrosine kinase. FEBS Letters, 537(1–3), 203–209. https://doi.org/10.1016/S0014-5793(03)00127-3

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