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Targeted Disruption of the Mouse PAS Domain Serine/Threonine Kinase PASKIN

By Dörthe M. Katschinski, Hugo H. Marti, Klaus F. Wagner, Junpei Shibata, Katrin Eckhardt, Falk Martin, Reinhard Depping, Uwe Paasch, Max Gassmann, Birgit Ledermann, Isabelle Desbaillets and Roland H. Wenger

Abstract

PASKIN is a novel mammalian serine/threonine kinase containing two PAS (Per-Arnt-Sim) domains. PASKIN is related to the Rhizobium oxygen sensor protein FixL and to AMP-regulated kinases. Like FixL, the sensory PAS domain of PASKIN controls the kinase activity by autophosphorylation in a (unknown) ligand-dependent manner. In Saccharomyces cerevisiae, the two PASKIN orthologues PSK1 and PSK2 phosphorylate three translation factors and two enzymes involved in glycogen synthesis, thereby coordinately regulating protein synthesis and glycolytic flux. To elucidate the function of mammalian PASKIN, we inactivated the mouse Paskin gene by homologous recombination in embryonic stem cells. Paskin(−/−) mice showed normal development, growth, and reproduction. The targeted integration of a lacZ reporter gene allowed the identification of the cell types expressing mouse PASKIN. Surprisingly, PASKIN expression is strongly upregulated in postmeiotic germ cells during spermatogenesis. However, fertility and sperm production and motility were not affected by the PASKIN knockout. The Ppp1r7 gene encoding Sds22, a regulatory subunit of protein phosphatase 1, shares the promoter region with the Paskin gene, pointing towards a common transcriptional regulation. Indeed, Sds22 colocalized with the cell types expressing PASKIN in vivo, suggesting a functional role of protein phosphatase-1 in the regulation of PASKIN autophosphorylation

Topics: Mammalian Genetic Models with Minimal or Complex Phenotypes
Publisher: American Society for Microbiology
Year: 2003
DOI identifier: 10.1128/MCB.23.19.6780-6789.2003
OAI identifier: oai:pubmedcentral.nih.gov:193927
Provided by: PubMed Central
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