PuSH - Publikationsserver des Helmholtz Zentrums München: RasGAP mediates neuronal survival in <em>Drosophila</em> through direct regulation of Rab5-dependent endocytosis.

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Rowshanravan, B.* ; Woodcock, S.A.* ; Botella, J.A.* ; Kiermayer, C. ; Schneuwly, S.* ; Hughes, D.A.*

RasGAP mediates neuronal survival in Drosophila through direct regulation of Rab5-dependent endocytosis.

J. Cell Sci. 127, 2849-2861 (2014)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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The GTPase Ras can either promote or inhibit cell survival. Inactivating mutations in RasGAP (vap), a Ras GTPase-activating protein, lead to age-related brain degeneration in Drosophila. Genetic interactions implicate the epidermal growth factor receptor (EGFR)-Ras pathway in promoting neurodegeneration but the mechanism is not known. Here we show that the Src homology 2 (SH2) domains of RasGAP are essential for its neuroprotective function. By using affinity purification and mass spectrometry, we identify a complex containing RasGAP together with Sprint, a Ras effector and putative activator of the endocytic GTPase Rab5. Formation of the RasGAP-Sprint complex requires the SH2 domains of RasGAP and tyrosine phosphorylation of Sprint. RasGAP and Sprint co-localize with Rab5-positive early endosomes but not with Rab7-positive late endosomes. We demonstrate a key role for this interaction in neurodegeneration: mutation of Sprint (or Rab5) suppresses neuronal cell death caused by the loss of RasGAP. These results indicate that the long-term survival of adult neurons in Drosophila is critically dependent on the activities of two GTPases, Ras and Rab5, regulated by the interplay of RasGAP and Sprint.

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