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. 1993 Jun 1;90(11):4882–4886. doi: 10.1073/pnas.90.11.4882

Identification and cloning of a protein kinase-encoding mouse gene, Plk, related to the polo gene of Drosophila.

F J Clay 1, S J McEwen 1, I Bertoncello 1, A F Wilks 1, A R Dunn 1
PMCID: PMC46617  PMID: 8099445

Abstract

We have determined the nucleotide sequence of a cDNA encoding a protein kinase that is closely related to the enzyme encoded by the Drosophila melanogaster mutant polo and that we have designated Plk (polo-like kinase). Plk is also related to the products of the Saccharomyces cerevisiae cell cycle gene MSD2 (CDC5) and the recently described early growth response gene Snk. Together, Plk, polo, Snk, and MSD2 define a subfamily of serine/threonine protein kinases. Plk is expressed at high levels in a number of fetal and newborn mouse tissues but is not expressed in the corresponding adult organs. With the exception of adult hemopoietic tissues, the only adult tissues in which we could detect Plk expression were ovaries and testes. Taken together, the patterns of Plk expression suggest an association with proliferating cells. Since polo is required for mitosis in Drosophila it is possible that Plk is involved in some aspect of cell cycle regulation in mammalian cells.

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