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J Biol Chem, Vol. 274, Issue 49, 35247-35254, December 3, 1999
From the Regulatory Biology Laboratory, Institute of Molecular and
Cell Biology, National University of Singapore, 30 Medical Drive,
Singapore 117609, Republic of Singapore and the
§ Department of Immunology, The Scripps Research Institute,
La Jolla, California 92037
Axin negatively regulates the Wnt pathway during
axis formation and plays a central role in cell growth control and
tumorigenesis. We found that Axin also serves as a scaffold protein for
mitogen-activated protein kinase activation and further determined the
structural requirement for this activation. Overexpression of Axin in
293T cells leads to differential activation of mitogen-activated
protein kinases, with robust induction for c-Jun
NH2-terminal kinase (JNK)/stress-activated protein
kinase, moderate induction for p38, and negligible induction for
extracellular signal-regulated kinase. Axin forms a complex with MEKK1
through a novel domain that we term MEKK1-interacting domain. MKK4 and
MKK7, which act downstream of MEKK1, are also involved in Axin-mediated
JNK activation. Domains essential in Wnt signaling, i.e.
binding sites for adenomatous polyposis coli, glycogen synthase
kinase-3
Axin Forms a Complex with MEKK1 and Activates c-Jun
NH2-terminal Kinase/Stress-activated Protein Kinase
through Domains Distinct from Wnt Signaling
, and
-catenin, are not required for JNK activation,
suggesting distinct domain utilization between the Wnt pathway and JNK
signal transduction. Dimerization/oligomerization of Axin through its C
terminus is required for JNK activation, although MEKK1 is capable of
binding C terminus-deleted monomeric Axin. Furthermore, Axin without
the MEKK1-interacting domain has a dominant-negative effect on JNK
activation by wild-type Axin. Our results suggest that Axin, in
addition to its function in the Wnt pathway, may play a dual role in
cells through its activation of JNK/stress-activated protein kinase
signaling cascade.
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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