Kim, HangunHan, Jeong-RanPark, JaejunOh, MinsooJames, Sarah E.Chang, SunghoeLu, QunLee, Kwang YoulKi, HyunkyoungSong, Woo-JooKwonseop, Kim2011-04-132011-05-172011-04-132011-05-172008-01-11Journal of Biological Chemistry; 283:2 p. 977-987http://hdl.handle.net/10342/3320delta-Catenin was first identified through its interaction with Presenilin-1 and has been implicated in the regulation of dendrogenesis and cognitive function. However, the molecular mechanisms by which delta-catenin promotes dendritic morphogenesis were unclear. In this study, we demonstrated delta-catenin interaction with p190RhoGEF, and the importance of Akt1-mediated phosphorylation at Thr-454 residue of delta -catenin in this interaction. We have also found that delta-catenin overexpression decreased the binding between p190RhoGEF and RhoA, and significantly lowered the levels of GTP-RhoA but not those of GTP-Rac1 and -Cdc42. delta-Catenin T454A, a defective form in p190RhoGEF binding, did not decrease the binding between p190RhoGEF and RhoA. delta-Catenin T454A also did not lower GTP-RhoA levels and failed to induce dendrite-like process formation in NIH 3T3 fibroblasts. Furthermore, delta-catenin T454A significantly reduced the length and number of mature mushroom shaped spines in primary hippocampal neurons. These results highlight signaling events in the regulation of delta-catenin-induced dendrogenesis and spine morphogenesis. Originally published Journal of Biological Chemistry, Vol. 283, No. 2, Jan 2008en-USAuthor notified of opt-out rights by Cammie Jennings prior to upload of this article.[Delta]-cateninPhosphorylationDendritic morphogenesisδ-cateninArticlePMC226578110.1074/jbc.M707158200