cDNA encoding a 59 kDa homolog of ribosomal protein S6 kinase from rabbit liver.
We have isolated cDNA molecules encoding a protein with the characteristic sequence elements that are conserved between the catalytic domains of protein kinases. This protein is apparently a serine/threonine kinase and is most closely related to the amino-terminal half of the ribosomal protein S6 kinase II first characterized in Xenopus eggs (42% overall identity and 56% identity in the predicted catalytic domain). However, it clearly differs from S6 kinase II in that it has only one, rather than two predicted catalytic domains and a deduced molecular mass of 59,109 Da. We propose that is may be more related to, or identical, with, the mitogen-inducible S6 kinase of molecular mass 65-70 kDa described in mammalian liver, mouse 3T3 cells and chicken embryos. Remarkable structural features of the cDNA-encoded polypeptide are a section rich in proline, serine and threonine residues that resemble the multiphosphorylation domains of glycogen synthase and phosphorylase kinase alpha subunit, and a characteristic tyrosine residue in the putative nucleotide-binding glycine cluster which, by analogy to cdc2 kinase, is a potential tyrosine phosphorylation site.
Institut für Physiologische Chemie, Abteilung für Biochemie Supramolekularer Systeme, Ruhr-Universität Bochum, FRG.
B
B
Harmann
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Kilimann
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D007527:Isoenzymes / Q000235:genetics*; D008099:Liver / Q000201:enzymology*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D011061:Poly A / Q000235:genetics / Q000302:isolation & purification; D011494:Protein Kinases / Q000235:genetics*; D012313:RNA / Q000235:genetics / Q000302:isolation & purification; D012333:RNA, Messenger; D011817:Rabbits; D019893:Ribosomal Protein S6 Kinases; D012689:Sequence Homology, Nucleic Acid
D007527:Isoenzymes; D012333:RNA, Messenger; D011061:Poly A; D012313:RNA; D004247:DNA; D011494:Protein Kinases; D019893:Ribosomal Protein S6 Kinases