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Neural precursor cell-expressed developmentally downregulated 4 (Nedd4) is an E3 ubiquitin-protein ligase that has an N-terminal C2 domain, three or four WW domains and a C-terminal HECT domain. The C2 domain is a small (∼130 amino acid) calcium binding, lipid-binding and protein-protein interaction domain. In polarized MDCK cells V5 epitope-tagged human Nedd4-2(+C2) and hNedd4-2(+C2) were used for both confocal and EM experiments. hNedd4-2(+C2) localized to the apical and lateral membranes of MDCK cells both in the presence and absence of increased cystolic calcium levels, and the hNedd4-2(DeltaC2) isoform demonstrated cystolic localization. Binding of GST-tagged C2 domains from rat Nedd4-1, hNedd4-1 and hNedd4-2 to nitrocellulose-bound phospholipids showed binding of all C2 domains to phosphatidylinositols (PtdIns) that increased with addition of calcium. This study has provided evidence that the C2 domain of hNedd4-2 serves to target the protein to the apical membrane of polarized epithelium where it can interact with its substrates.
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Source: Masters Abstracts International, Volume: 44-06, page: 2803.
Thesis (M.Sc.)--University of Toronto, 2006.
Electronic version licensed for access by U. of T. users.
ROBARTS MICROTEXT copy on microfiche.
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- Created October 21, 2008
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