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Role of DNedd4 Splice Isoforms in Neuromuscular Synaptogenesis in Drosophila Melanogaster

Drosophila Nedd4 (DNedd4), an E3 ubiquitin ligase, is known to be involved in neuromuscular (NM) synaptogenesis during embryogenesis. To further elucidate its mechanism and function in this process, two major splice isoforms, dNedd4 short (dNedd4S) and dNedd4 long (dNedd4L), were studied. My work shows that while dNedd4S positively regulates NM synaptogenesis, dNedd4L plays a negative role in this process. Unique regions in dNedd4L, including the N-terminal 66 amino acid-long sequence (but not the putative dAkt phosphorylation site) and the middle 159 amino acid-long sequence, as well as the catalytic site, are required for its negative function. I proposed one possible mechanism of dNedd4L acting as a negative regulator of dNedd4S. Results from my studies of the putative effect of dNedd4L on the catalytic activity of dNedd4S in vitro, as well as on the function of dNedd4S towards Comm in Drosophila S2 cells, did not support this mechanism.

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OTU.1807/27382
Date01 June 2011
CreatorsZhong, Yunan
ContributorsRotin, Daniela
Source SetsLibrary and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
Languageen_ca
Detected LanguageEnglish
TypeThesis

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