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Pubmed ID :19270696
Publication Date : //

Two Beclin 1-binding proteins, Atg14L and Rubicon, reciprocally regulate autophagy at different stages.


Beclin 1, a protein essential for autophagy, binds to hVps34/Class III phosphatidylinositol-3-kinase and UVRAG. Here, we have identified two Beclin 1 associated proteins, Atg14L and Rubicon. Atg14L and UVRAG bind to Beclin 1 in a mutually exclusive manner, whereas Rubicon binds only to a subpopulation of UVRAG complexes; thus, three different Beclin 1 complexes exist. GFP-Atg14L localized to the isolation membrane and autophagosome, as well as to the ER and unknown puncta. Knockout of Atg14L in mouse ES cells caused a defect in autophagosome formation. GFP-Rubicon was localized at the endosome/lysosome. Knockdown of Rubicon caused enhancement of autophagy, especially at the maturation step, as well as enhancement of endocytic trafficking. These data suggest that the Beclin 1-hVps34 complex functions in two different steps of autophagy by altering the subunit composition.

Authors : Matsunaga Kohichi , Saitoh Tatsuya , Tabata Keisuke , Omori Hiroko , Satoh Takashi , Kurotori Naoki , Maejima Ikuko , Shirahama-Noda Kanae , Ichimura Tohru , Isobe Toshiaki , Akira Shizuo , Noda Takeshi , Yoshimori Tamotsu ,

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