Abstract
Nedd4 is a ubiquitin protein ligase composed of a C2 domain, three (or four) WW domains and a ubiquitin ligase Hect domain. Nedd4 was demonstrated to bind the epithelial sodium channel (αβγENaC), by association of its WW domains with PY motifs (XPPXY) present in each ENaC subunit, and to regulate the cell surface stability of the channel. The PY motif of βENaC is deleted or mutated in Liddle syndrome, a hereditary form of hypertension caused by elevated ENaC activity. Here we report the solution structure of the third WW domain of Nedd4 complexed to the PY motif-containing region of βENaC (TLPIPGTPPPNYDSL, referred to as βP2). A polyproline type II helical conformation is adopted by the PPPN sequence. Unexpectedly, the C-terminal sequence YDSL forms a helical turn and both the tyrosine and the C-terminal leucine contact the WW domain. This is unlike other proline-rich peptides complexed to WW domains, which bind in an extended conformation and lack molecular interactions with residues C-terminal to the tyrosine or the structurally equivalent residue in non-PY motif WW domain targets. The Nedd4 WW domain–ENaC βP2 peptide structure expands our understanding of the mechanisms involved in WW domain–ligand recognition and the molecular basis of Liddle syndrome.
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Acknowledgements
We acknowledge M. Nilges for modifications to ARIA and many useful discussions. We thank R. Muhandiram, D. Yang and L.E. Kay for assistance with NMR data collection. Structures were calculated at the Ontario Centre for Genomic Computing. We thank J.P. Noel, M.J. Eck and O. Staub for preprints prior to publication. V.K. is a recipient of an Ontario Graduate Fellowship. This work was supported by grants to D.R. from the Medical Research Council of Canada (MRC) / Canadian Institute for Health Research (CIHR) and Human Frontier Science Program, and to J.D.F.–K. from the National Cancer Institute of Canada (NCIC).
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Kanelis, V., Rotin, D. & Forman-Kay, J. Solution structure of a Nedd4 WW domain–ENaC peptide complex. Nat Struct Mol Biol 8, 407–412 (2001). https://doi.org/10.1038/87562
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DOI: https://doi.org/10.1038/87562
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