WRM-1 activates the LIT-1 protein kinase to transduce anterior/posterior polarity signals in C. elegans.
During C. elegans development, Wnt/WG signaling is required for differences in cell fate between sister cells born from anterior/posterior divisions. A beta-catenin-related gene, wrm-1, and the lit-1 gene are effectors of this signaling pathway and appear to downregulate the activity of POP-1, a TCF/LEF-related protein, in posterior daughter cells. We ... show here that lit-1 encodes a serine/threonine protein kinase homolog related to the Drosophila tissue polarity protein Nemo. We demonstrate that the WRM-1 protein binds to LIT-1 in vivo and that WRM-1 can activate the LIT-1 protein kinase when coexpressed in vertebrate tissue culture cells. This activation leads to phosphorylation of POP-1 and to apparent changes in its subcellular localization. Our findings provide evidence for novel regulatory avenues for an evolutionarily conserved Wnt/WG signaling pathway.
Mesh Terms:
Amino Acid Sequence, Animals, COS Cells, Caenorhabditis elegans, Caenorhabditis elegans Proteins, Cytoskeletal Proteins, DNA-Binding Proteins, Enzyme Activation, Helminth Proteins, High Mobility Group Proteins, Membrane Proteins, Mitogen-Activated Protein Kinases, Molecular Sequence Data, Phosphorylation, Protein-Serine-Threonine Kinases, Signal Transduction, Trans-Activators, beta Catenin
Amino Acid Sequence, Animals, COS Cells, Caenorhabditis elegans, Caenorhabditis elegans Proteins, Cytoskeletal Proteins, DNA-Binding Proteins, Enzyme Activation, Helminth Proteins, High Mobility Group Proteins, Membrane Proteins, Mitogen-Activated Protein Kinases, Molecular Sequence Data, Phosphorylation, Protein-Serine-Threonine Kinases, Signal Transduction, Trans-Activators, beta Catenin
Cell
Date: Jun. 11, 1999
PubMed ID: 10380924
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