Specific armadillo repeat sequences facilitate β-catenin nuclear transport in live cells via direct binding to nucleoporins Nup62, Nup153, and RanBP2/Nup358.

ABSTRACT: β-Catenin transduces the Wnt signal from the membrane to nucleus, and certain gene mutations trigger its nuclear accumulation leading to cell transformation and cancer. β-Catenin shuttles between the nucleus and cytoplasm independent of classical Ran/transport receptor pathways, and this movement was previously hypothesized to involve the central Armadillo (Arm) domain. Fluorescence recovery after photobleaching (FRAP) assays were used to delineate functional transport regions of the Arm domain in living cells. The strongest nuclear import/export activity was mapped to Arm repeats R10-12 using both in vivo FRAP and in vitro export assays. By comparison, Arm repeats R3-8 of β-catenin were highly active for nuclear import but displayed a comparatively weak export activity. We show for the fi

SUBMITTER: Sharma M 

PROVIDER: S-EPMC3256910 | biostudies-literature | 2012 Jan

REPOSITORIES: biostudies-literature