2ez5
From Proteopedia
Solution Structure of the dNedd4 WW3* Domain- Comm LPSY Peptide Complex
Structural highlights
Function[NEDD4_DROME] Essential E3 ubiquitin-protein ligase which accepts ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. Down-regulates Notch/N signaling pathway by promoting Notch ubiquitination, endocytosis and degradation.[1] [2] [3] [COMM_DROME] Controls axon guidance across the CNS midline by preventing the delivery of Robo to the growth cone.[4] [5] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedInteractions between the WW domains of Drosophila Nedd4 (dNedd4) and Commissureless (Comm) PY motifs promote axon crossing at the CNS midline and muscle synaptogenesis. Here we report the solution structure of the dNedd4 WW3* domain complexed to the second PY motif (227'TGLPSYDEALH237') of Comm. Unexpectedly, there are interactions between WW3* and ligand residues both N- and C-terminal to the PY motif. Residues Y232'-L236' form a helical turn, following the PPII helical PY motif. Mutagenesis and binding studies confirm the importance of these extensive contacts, not simultaneously observed in other WW domain complexes, and identify a variable loop in WW3* responsible for its high-affinity interaction. These studies expand our general understanding of the molecular determinants involved in WW domain-ligand recognition. In addition, they provide insights into the specific regulation of dNedd4-mediated ubiquitination of Comm and subsequent internalization of Comm or the Comm/Roundabout complex, critical for CNS and muscle development. Structural determinants for high-affinity binding in a Nedd4 WW3* domain-Comm PY motif complex.,Kanelis V, Bruce MC, Skrynnikov NR, Rotin D, Forman-Kay JD Structure. 2006 Mar;14(3):543-53. PMID:16531238[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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