The Src/Csk regulatory circuit arose early in metazoan evolution

We have identified a gene encoding a member of the Csk family of non-receptor protein-tyrosine kinases (PTKs) in the early-diverging metazoan Hydra. In situ hybridization analysis of the distribution of RNA from the Hydra Csk gene indicates that it is expressed in most of the epithelial cells of the...

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Veröffentlicht in:Oncogene 2000-08, Vol.19 (34), p.3925-3930
Hauptverfasser: MILLER, M. A, MALIK, I. A, SHENK, M. A, STEELE, R. E
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container_issue 34
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container_title Oncogene
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creator MILLER, M. A
MALIK, I. A
SHENK, M. A
STEELE, R. E
description We have identified a gene encoding a member of the Csk family of non-receptor protein-tyrosine kinases (PTKs) in the early-diverging metazoan Hydra. In situ hybridization analysis of the distribution of RNA from the Hydra Csk gene indicates that it is expressed in most of the epithelial cells of the adult polyp and in gametogenic cells. Comparison of the expression pattern of Hydra Csk with that of STK, the Hydra Src gene orthologue, reveals that the two genes are largely co-expressed. Such co-expression is consistent with a role for Hydra Csk in regulation of STK activity. This possibility was tested directly by coexpressing Hydra Csk with STK in yeast. Co-expression suppressed the growth inhibition seen when STK alone is expressed in yeast. Suppression was dependent on the presence of the putative regulatory tyrosine in the carboxyl-terminal tail of STK. Phosphotyrosine immunoblot analysis confirmed that expression of Csk resulted in suppression of STK kinase activity. Taken together these data indicate that the regulatory circuit involving Src and Csk PTKs was established prior to the divergence of the phylum Cnidaria from the rest of the metazoans.
doi_str_mv 10.1038/sj.onc.1203714
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A</au><au>MALIK, I. A</au><au>SHENK, M. A</au><au>STEELE, R. E</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Src/Csk regulatory circuit arose early in metazoan evolution</atitle><jtitle>Oncogene</jtitle><addtitle>Oncogene</addtitle><date>2000-08-10</date><risdate>2000</risdate><volume>19</volume><issue>34</issue><spage>3925</spage><epage>3930</epage><pages>3925-3930</pages><issn>0950-9232</issn><eissn>1476-5594</eissn><coden>ONCNES</coden><abstract>We have identified a gene encoding a member of the Csk family of non-receptor protein-tyrosine kinases (PTKs) in the early-diverging metazoan Hydra. In situ hybridization analysis of the distribution of RNA from the Hydra Csk gene indicates that it is expressed in most of the epithelial cells of the adult polyp and in gametogenic cells. Comparison of the expression pattern of Hydra Csk with that of STK, the Hydra Src gene orthologue, reveals that the two genes are largely co-expressed. Such co-expression is consistent with a role for Hydra Csk in regulation of STK activity. This possibility was tested directly by coexpressing Hydra Csk with STK in yeast. Co-expression suppressed the growth inhibition seen when STK alone is expressed in yeast. Suppression was dependent on the presence of the putative regulatory tyrosine in the carboxyl-terminal tail of STK. Phosphotyrosine immunoblot analysis confirmed that expression of Csk resulted in suppression of STK kinase activity. Taken together these data indicate that the regulatory circuit involving Src and Csk PTKs was established prior to the divergence of the phylum Cnidaria from the rest of the metazoans.</abstract><cop>Basingstoke</cop><pub>Nature Publishing</pub><pmid>10951585</pmid><doi>10.1038/sj.onc.1203714</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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subjects Amino acids
Animals
Biological and medical sciences
Biological Evolution
Catalytic Domain
Cell Division - genetics
Cell physiology
Cnidaria
Csk protein
Divergence
Epithelial cells
Evolution
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation
Genes
Hybridization analysis
Hydra
Hydra - physiology
Invertebrates
Kinases
Molecular and cellular biology
Phosphorylation
Phosphotyrosine
Phylogenetics
Phylogeny
Polymerase Chain Reaction
Polyps (organisms)
Protein-Tyrosine Kinases - genetics
Protein-Tyrosine Kinases - metabolism
Proteins
Receptor Protein-Tyrosine Kinases - genetics
Receptor Protein-Tyrosine Kinases - metabolism
Receptors, Cell Surface - genetics
Receptors, Cell Surface - metabolism
Regulation
Responses to growth factors, tumor promotors, other factors
Src protein
src-Family Kinases - genetics
src-Family Kinases - metabolism
STK gene
Tyrosine
Vertebrates
Yeasts - genetics
Yeasts - growth & development
title The Src/Csk regulatory circuit arose early in metazoan evolution
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