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We have developed a novel Saccharomyces cerevisiae model system to dissect the molecular events of beta-catenin (beta-cat) signaling. Coexpression of mammalian beta-cat with TCF4 or LEF1 results in nuclear accumulation of these proteins and a functional complex that activates reporter gene transcription from constructs containing leukocyte enhancer factor (LEF)/T cell factor (TCF) response elements. Reporter transcription is constitutive, requires expression of both beta-cat and TCF4 or LEF1, and is not supported by mutated LEF/TCF binding elements or by TCF4 or LEF1 mutants. A cytoplasmic domain of E-cadherin or a functional fragment of adenomatous polyposis coli (APC) protein (APC-25) complexes with beta-cat, reduces beta-cat binding to TCF4, and leads to increased cytoplasmic localization of beta-cat and a reduction in reporter activation. Systematic mutation of putative nuclear export signal sequences in APC-25 decreases APC-25 binding to beta-cat and restores reporter gene transcription. Additional beta-cat signaling components, Axin and glycogen synthase kinase 3beta, form a multisubunit complex similar to that found in mammalian cells. Coexpression of the F-box protein beta-transducin repeat-containing protein reduces the stability of beta-cat and decreases reporter activation. Thus, we have reconstituted a functional beta-cat signal transduction pathway in yeast and show that beta-cat signaling can be regulated at multiple levels, including protein subcellular localization, protein complex formation, and protein stability.
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