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Identification of Mitogen-activated Protein (MAP) Kinase-activated Protein Kinase-3, a Novel Substrate of CSBP p38 MAP Kinase
Open accessAbstract
CSBP p38 is a mitogen-activated protein kinase that is activated in response to stress, endotoxin, interleukin 1, and tumor necrosis factor. Using a catalytically inactive mutant (D168A) of human CSBP2 as the bait in a yeast two-hybrid screen, we have identified and cloned a novel kinase which shares approximately 70% amino acid identity to mitogen-activated protein kinase-activated protein kinase (MAPKAP kinase)-2, and thus was designated MAPKAP kinase-3. The binding of CSBP to MAPKAP kinase-3 was confirmed in vitro by the precipitation of epitope-tagged CSBP1, CSBP2, and CSBP2(D168A) and endogenous CSBP from mammalian cells by a bacterially expressed GST-MAPKAP kinase-3 fusion protein and in vivo by co-precipitation of the epitope-tagged proteins co-expressed in HeLa cells. MAPKAP kinase-3 was phosphorylated by both CSBP1 and CSBP2 and was then able to phosphorylate HSP27 in vitro. Treatment of HeLa cells with sorbitol or TNF resulted in activation of CSBP and MAPKAP kinase-3 and activation of MAPKAP kinase-3 could be blocked by preincubation of cells with SB203580, a specific inhibitor of CSBP kinase activity. These data suggest that MAPKAP kinase-3 is activated by stress and cytokines and is a novel substrate of CSBP both in vitro and in vivo.
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Independent Human MAP-Kinase Signal Transduction Pathways Defined by MEK and MKK Isoforms
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Metadata
- Authors
- McLaughlin, M. M., Kumar, S., McDonnell, P. C., Van Horn, S., Lee, J. C., Livi, G. P., & Young, P. R.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1996-04
- Volume
- 271
- Issue
- 14
- Pages
- 8488-8492
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2094179447
- Cited by
- 342
- References
- 2
- FWCI
- 13.98
- Type
- journal article
- Language
- en
- Open access
- hybrid
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