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Mol. Cell. Biol., 11 1995, 6213-6221, Vol 15, No. 11
M Komada and N Kitamura
The activation of growth factor receptor tyrosine kinases leads to tyrosine
phosphorylation of many intracellular proteins which are thought to play
crucial roles in growth factor signaling pathways. We previously showed
that tyrosine phosphorylation of a 115-kDa protein is rapidly induced in
cells treated with hepatocyte growth factor. To clarify the structure and
possible function of the 115-kDa protein (designated Hrs for hepatocyte
growth factor-regulated tyrosine kinase substrate), we purified this
protein from B16-F1 mouse melanoma cells by anti-phosphotyrosine
immunoaffinity chromatography and determined its partial amino acid
sequences. On the basis of the amino acid sequences, we molecularly cloned
the cDNA for mouse Hrs. The nucleotide sequence of the cDNA revealed that
Hrs is a novel 775-amino-acid protein with a putative zinc finger domain
that is structurally conserved in several other proteins. This protein also
contained a proline-rich region and a proline- and glutamine-rich region.
The expression of Hrs mRNA was detected in all adult mouse tissues tested
and also in embryos. To analyze the Hrs cDNA product, we prepared a
polyclonal antibody against bacterially expressed Hrs. Using this antibody,
we showed by subcellular fractionation that Hrs is localized to the
cytoplasm; we also showed that that tyrosine phosphorylation of Hrs is
induced in cells treated with epidermal growth factor or platelet-derived
growth factor. These results suggest that Hrs plays a unique and important
role in the signaling pathway of growth factors.
Copyright © 1995, American Society for Microbiology
Growth factor-induced tyrosine phosphorylation of Hrs, a novel 115- kilodalton protein with a structurally conserved putative zinc finger domain
Institute for Liver Research, Kansai Medical University, Osaka, Japan.
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