title: Activation of YRP kinase by v-Src and protein kinase C-mediated signal transduction pathways.
abstract: We have previously reported that a serine(threonine) protein kinase that phosphorylates histone H1 in vitro is activated by tyrosine phosphorylation in v-Src-transformed rat 3Y1 fibroblasts. We now refer to this kinase as YRP kinase, for tyrosine-regulated protein kinase. Since YRP kinase may play a role in mediating the growth-stimulatory and morphology-altering effects of v-Src, we have further examined the signal transduction involved in the activation of YRP kinase. Although YRP kinase is constitutively activated in fibroblasts transformed by v-Src, activation of protein kinase C was also found to lead to activation of YRP kinase. Activation of YRP kinase by protein kinase C was found to be potentiated by vanadate treatment or overexpression of c-Src. The activation of YRP kinase by v-Src, however, does not appear to be mediated by protein kinase C, suggesting that YRP kinase can be activated by two separate signal transduction pathways. Transformation of fibroblasts by v-Ras or v-Mil did not result in activation of YRP kinase, indicating that the MAP kinase pathway does not mediate the activation of YRP kinase by v-Src or protein kinase C.
authors.affiliation: Laboratory of Molecular Oncology, Rockefeller University, New York, NY 10021, USA.
authors.forename: G
authors.initials: G
authors.lastname: Scholz
authors.forename: M P
authors.initials: MP
authors.lastname: Felder
authors.forename: H
authors.initials: H
authors.lastname: Hanafusa
mesh_terms: D000818:Animals; D001358:Avian Sarcoma Viruses / Q000235:genetics; D002461:Cell Line, Transformed; D002642:Chick Embryo; D002645:Chickens; D004789:Enzyme Activation; D005347:Fibroblasts / Q000201:enzymology; D015870:Gene Expression; D011905:Genes, ras; D016391:Genes, src; D015688:Oncogene Protein pp60(v-src) / Q000378:metabolism*; D027384:Oncogene Proteins v-raf; D010766:Phosphorylation; D019000:Phosphotyrosine; D011493:Protein Kinase C / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D016392:Proto-Oncogene Proteins pp60(c-src) / Q000096:biosynthesis; D015682:Retroviridae Proteins, Oncogenic / Q000378:metabolism; D015398:Signal Transduction; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014162:Transfection; D014443:Tyrosine / Q000031:analogs & derivatives / Q000032:analysis / Q000378:metabolism
chemical_list: D015682:Retroviridae Proteins, Oncogenic; D019000:Phosphotyrosine; D014443:Tyrosine; C092973:YRP kinase; D011505:Protein-Tyrosine Kinases; D015688:Oncogene Protein pp60(v-src); D016392:Proto-Oncogene Proteins pp60(c-src); D027384:Oncogene Proteins v-raf; D017346:Protein Serine-Threonine Kinases; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate