PMID:18948261

Citation	Jung, H, Seong, HA and Ha, H (2008) Murine protein serine/threonine kinase 38 activates apoptosis signal-regulating kinase 1 via Thr 838 phosphorylation. J. Biol. Chem. 283:34541-53
Abstract	Murine protein serine/threonine kinase 38 (MPK38) is a member of the AMP-activated protein kinase-related serine/threonine kinase family that plays an important role in various cellular processes, including cell cycle, signaling pathways, and self-renewal of stem cells. Here we demonstrate a functional association between MPK38 and apoptosis signal-regulating kinase 1 (ASK1). The physical association between MPK38 and ASK1 was mediated through their carboxyl-terminal regulatory domains and was increased by H(2)O(2) or tumor necrosis factor alpha treatment. The use of kinase-dead MPK38 and ASK1 mutants revealed that MPK38-ASK1 complex formation was dependent on the activities of both kinases. Ectopic expression of wild-type MPK38, but not kinase-dead MPK38, stimulated ASK1 activity by Thr(838) phosphorylation and enhanced ASK1-mediated signaling to both JNK and p38 kinases. However, the phosphorylation of MKK6 and p38 by MPK38 was not detectable. In addition, MPK38-mediated ASK1 activation was induced through the increased interaction between ASK1 and its substrate MKK3. MPK38 also stimulated H(2)O(2)-mediated apoptosis by enhancing the ASK1 activity through Thr(838) phosphorylation. These results suggest that MPK38 physically interacts with ASK1 in vivo and acts as a positive upstream regulator of ASK1.
Links	PubMed PMC3259894 Online version:10.1074/jbc.M807219200
Keywords	Animals; Apoptosis; Cell Line; Enzyme Activation; Humans; Hydrogen Peroxide/pharmacology; MAP Kinase Kinase 4/metabolism; MAP Kinase Kinase Kinase 5/metabolism; Mice; Mutation; Phosphorylation; Protein Structure, Tertiary; Protein-Serine-Threonine Kinases/metabolism; Threonine/chemistry; Transcriptional Activation
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
MOUSE:MP2K3	enables	GO:0019901: protein kinase binding	ECO:0000353: physical interaction evidence used in manual assertion	UniProtKB:O35099	F		Seeded From UniProt	complete
MOUSE:M3K5	enables	GO:0005515: protein binding	ECO:0000353: physical interaction evidence used in manual assertion	UniProtKB:O09110	F		Seeded From UniProt	complete
MOUSE:MELK	enables	GO:0005515: protein binding	ECO:0000353: physical interaction evidence used in manual assertion	UniProtKB:O35099	F		Seeded From UniProt	complete
MOUSE:MELK	enables	GO:0004674: protein serine/threonine kinase activity	ECO:0000314: direct assay evidence used in manual assertion		F		Seeded From UniProt	complete
MOUSE:MELK	involved_in	GO:0043065: positive regulation of apoptotic process	ECO:0000314: direct assay evidence used in manual assertion		P		Seeded From UniProt	complete
MOUSE:MELK	acts_upstream_of_or_within	GO:0008631: intrinsic apoptotic signaling pathway in response to oxidative stress	ECO:0000314: direct assay evidence used in manual assertion		P		Seeded From UniProt	complete
MOUSE:M3K5	involved_in	GO:0043065: positive regulation of apoptotic process	ECO:0000314: direct assay evidence used in manual assertion		P		Seeded From UniProt	complete
MOUSE:M3K5	enables	GO:0019901: protein kinase binding	ECO:0000353: physical interaction evidence used in manual assertion	UniProtKB:Q61846	F		Seeded From UniProt	complete
MOUSE:M3K5	enables	GO:0004709: MAP kinase kinase kinase activity	ECO:0000314: direct assay evidence used in manual assertion		F		Seeded From UniProt	complete
MOUSE:M3K5	acts_upstream_of_or_within	GO:0008631: intrinsic apoptotic signaling pathway in response to oxidative stress	ECO:0000314: direct assay evidence used in manual assertion		P		Seeded From UniProt	complete

References

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