| Literature DB >> 21946561 |
Kazumasa Yokoyama1, Tohru Tezuka, Masaharu Kotani, Takanobu Nakazawa, Naosuke Hoshina, Yasushi Shimoda, Shigeru Kakuta, Katsuko Sudo, Kazutada Watanabe, Yoichiro Iwakura, Tadashi Yamamoto.
Abstract
The phosphoinositide 3-kinase (PI3K) pathway has been extensively studied in neuronal function and morphogenesis. However, the precise molecular mechanisms of PI3K activation and its downstream signalling in neurons remain elusive. Here, we report the identification of the Neuronal tYrosine-phosphorylated Adaptor for the PI 3-kinase (NYAP) family of phosphoproteins, which is composed of NYAP1, NYAP2, and Myosin16/NYAP3. The NYAPs are expressed predominantly in developing neurons. Upon stimulation with Contactin5, the NYAPs are tyrosine phosphorylated by Fyn. Phosphorylated NYAPs interact with PI3K p85 and activate PI3K, Akt, and Rac1. Moreover, the NYAPs interact with the WAVE1 complex which mediates remodelling of the actin cytoskeleton after activation by PI3K-produced PIP(3) and Rac1. By simultaneously interacting with PI3K and the WAVE1 complex, the NYAPs bridge a PI3K-WAVE1 association. Disruption of the NYAP genes in mice affects brain size and neurite elongation. In conclusion, the NYAPs activate PI3K and concomitantly recruit the downstream effector WAVE complex to the close vicinity of PI3K and regulate neuronal morphogenesis.Entities:
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Year: 2011 PMID： 21946561 PMCID： PMC3243607 DOI： 10.1038/emboj.2011.348
Source DB: PubMed Journal: EMBO J ISSN： 0261-4189 Impact factor: 11.598