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Science 15 February 2002:
Vol. 295. no. 5558, pp. 1291 - 1294
DOI: 10.1126/science.1067289

Reports

MAPKK-Independent Activation of p38alpha Mediated by TAB1-Dependent Autophosphorylation of p38alpha

Baoxue Ge,1 Hermann Gram,2 Franco Di Padova,2 Betty Huang,3 Liguo New,1 Richard J. Ulevitch,1 Ying Luo,34 Jiahuai Han1*

Phosphorylation of mitogen-activated protein kinases (MAPKs) on specific tyrosine and threonine sites by MAP kinase kinases (MAPKKs) is thought to be the sole activation mechanism. Here, we report an unexpected activation mechanism for p38alpha MAPK that does not involve the prototypic kinase cascade. Rather it depends on interaction of p38alpha with TAB1 [transforming growth factor-beta -activated protein kinase 1 (TAK1)-binding protein 1] leading to autophosphorylation and activation of p38alpha . We detected formation of a TRAF6-TAB1-p38alpha complex and showed stimulus-specific TAB1-dependent and TAB1-independent p38alpha activation. These findings suggest that alternative activation pathways contribute to the biological responses of p38alpha to various stimuli.

1 Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
2 Novartis Pharma AG, CH-4002, Basel, Switzerland.
3 Rigel, Inc., South San Francisco, CA 94080, USA.
4 Shanghai Genomics, Inc., Shanghai, China.
*   To whom correspondence should be addressed. E-mail: jhan{at}scripps.edu


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   Abstract »    Full Text »    PDF »
TAB1beta (Transforming Growth Factor-beta -activated Protein Kinase 1-binding Protein 1beta ), a Novel Splicing Variant of TAB1 That Interacts with p38alpha but Not TAK1.
B. Ge, X. Xiong, Q. Jing, J. L. Mosley, A. Filose, D. Bian, S. Huang, and J. Han (2003)
J. Biol. Chem. 278, 2286-2293
   Abstract »    Full Text »    PDF »
Negative Feedback Regulation of MKK6 mRNA Stability by p38{alpha} Mitogen-Activated Protein Kinase.
C. Ambrosino, G. Mace, S. Galban, C. Fritsch, K. Vintersten, E. Black, M. Gorospe, and A. R. Nebreda (2003)
Mol. Cell. Biol. 23, 370-381
   Abstract »    Full Text »
A Dominant-negative p38 MAPK Mutant and Novel Selective Inhibitors of p38 MAPK Reduce Insulin-stimulated Glucose Uptake in 3T3-L1 Adipocytes without Affecting GLUT4 Translocation.
R. Somwar, S. Koterski, G. Sweeney, R. Sciotti, S. Djuric, C. Berg, J. Trevillyan, P. E. Scherer, C. M. Rondinone, and A. Klip (2002)
J. Biol. Chem. 277, 50386-50395
   Abstract »    Full Text »    PDF »
Mitogen-Activated Protein Kinase Pathways Mediated by ERK, JNK, and p38 Protein Kinases.
G. L. Johnson and R. Lapadat (2002)
Science 298, 1911-1912
   Abstract »    Full Text »    PDF »
Inhibition of p38 MAPK by Glucocorticoids via Induction of MAPK Phosphatase-1 Enhances Nontypeable Haemophilus influenzae-induced Expression of Toll-like Receptor 2.
A. Imasato, C. Desbois-Mouthon, J. Han, H. Kai, A. C. B. Cato, S. Akira, and J.-D. Li (2002)
J. Biol. Chem. 277, 47444-47450
   Abstract »    Full Text »    PDF »
Fyn and p38 Signaling Are Both Required for Maximal Hypertonic Activation of the Osmotic Response Element-binding Protein/Tonicity-responsive Enhancer-binding Protein (OREBP/TonEBP).
B. C. B. Ko, A. K. M. Lam, A. Kapus, L. Fan, S. K. Chung, and S. S. M. Chung (2002)
J. Biol. Chem. 277, 46085-46092
   Abstract »    Full Text »    PDF »
Transforming Growth Factor-beta Stimulates Parathyroid Hormone-related Protein and Osteolytic Metastases via Smad and Mitogen-activated Protein Kinase Signaling Pathways.
S.-M. Kakonen, K. S. Selander, J. M. Chirgwin, J. J. Yin, S. Burns, W. A. Rankin, B. G. Grubbs, M. Dallas, Y. Cui, and T. A. Guise (2002)
J. Biol. Chem. 277, 24571-24578
   Abstract »    Full Text »    PDF »



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