The C. elegans SYS-1 protein is a bona fide beta-catenin.Liu, J., Phillips, B.T., Amaya, M.F., Kimble, J., Xu, W.
(2008) Dev Cell 14: 751-761
- PubMed: 18477457
- DOI: 10.1016/j.devcel.2008.02.015
- Primary Citation of Related Structures:
- PubMed Abstract:
- A beta-catenin identified by functional rather than sequence criteria and its role in Wnt/MAPK signaling.
Miskowski, J., Li, Y., Kimble, J.
(2005) Cell 121: 761
- The sys-1 gene and sexual dimorphism during gonadogenesis in Caenorhabditis elegans.
Kidd III, A.R., Miskowski, J.A., Siegfried, K.R., Sawa, H., Kimble, J.
(2001) Dev Biol 230: 61
- Reciprocal asymmetry of SYS-1/beta-catenin and POP-1/TCF controls asymmetric divisions in Caenorhabditis elegans.
Phillips, B.T., Kidd III, A.R., King, R., Hardin, J., Kimble, J.
(2007) Proc Natl Acad Sci U S A 104: 3231
- Binary cell fate specification during C. elegans embryogenesis driven by reiterated reciprocal asymmetry of TCF POP-1 and its coactivator beta-catenin SYS-1.
Huang, S., Shetty, P., Robertson, S.M., Lin, R.
(2007) Development 134: 2685
C. elegans SYS-1 has key functional characteristics of a canonical beta-catenin, but no significant sequence similarity. Here, we report the SYS-1 crystal structure, both on its own and in a complex with POP-1, the C. elegans TCF homolog. The two str ...
C. elegans SYS-1 has key functional characteristics of a canonical beta-catenin, but no significant sequence similarity. Here, we report the SYS-1 crystal structure, both on its own and in a complex with POP-1, the C. elegans TCF homolog. The two structures possess signature features of canonical beta-catenin and the beta-catenin/TCF complex that could not be predicted by sequence. Most importantly, SYS-1 bears 12 armadillo repeats and the SYS-1/POP-1 interface is anchored by a conserved salt-bridge, the "charged button." We also modeled structures for three other C. elegans beta-catenins to predict the molecular basis of their distinct binding properties. Finally, we generated a phylogenetic tree, using the region of highest structural similarity between SYS-1 and beta-catenin, and found that SYS-1 clusters robustly within the beta-catenin clade. We conclude that the SYS-1 protein belongs to the beta-catenin family and suggest that additional divergent beta-catenins await discovery.
Department of Biological Structure, University of Washington, Seattle, WA 98195-7420, USA.