ESCRT-0 component Hrs is an effector of Rab35.

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Presentation transcript:

ESCRT-0 component Hrs is an effector of Rab35. ESCRT-0 component Hrs is an effector of Rab35. A, Images of HEK293T cells coexpressing EGFP-Rab35 and the indicated mCh-tagged ESCRT proteins. Scale bar, 10 μm. B, Immunoblot of lysates from HEK293T cells expressing HA-Rab35 and mCh-Hrs, mCh-STAM, mCh-TSG101, or mCh-CHMP2B, immunoprecipitated (IP) with mCherry antibody, and probed with HA or mCherry antibodies. C, Representative immunoblot of HEK cell lysates expressing HA-Rab35 and Flag-Hrs, incubated with either GDP or GTPγs, subject to IP with Flag antibody, and probed with HA and Flag antibodies. D, Quantification of HA-Rab35 intensity normalized to Flag-Hrs intensity in the eluate and reported as a fraction of the amount in the GDP condition (n = 5). *p < 0.05. E, Representative immunoblot of HEK cell lysates expressing Flag-Hrs, subject to pull-down with GST, GST-Rab35-GDP, or GST-Rab35-GTPγs and probed with GST and Flag antibodies. F, Quantification of Flag-Hrs intensity, normalized to GST-Rab35 intensity in the eluate (n = 4). **p < 0.01. G, Images of neurons cotransfected with mCh-Hrs and either soluble EGFP or EGFP-Rab35, fixed and immunostained against VAMP2. Arrows indicate mCh-Hrs puncta that colocalize with VAMP2 in axons expressing either soluble EGFP or EGFP-Rab35. Scale bar, 10 μm. H, Images of neurons cotransfected with CHMP2B-mCh and either soluble EGFP or EGFP-Rab35, fixed and immunostained against VAMP2. Arrows indicate CHMP2B-mCh puncta that colocalize with VAMP2 in axons expressing either soluble EGFP or EGFP-Rab35. Scale bar, 10 μm. I, Quantification of the fraction of Hrs and CHMP2B puncta that colocalize with VAMP2 in each condition (for Hrs: n = 15 for control, n = 19 for Rab35 from 3 replicate weeks, each with ∼25 puncta/image; for CHMP2B: n = 5 for control, n = 8 for Rab35 from 2 replicate weeks, ∼15 puncta/image). **p < 0.01. J, Super-resolution images of neurons cotransfected with EGFP-Rab35 and mCh-Hrs. Inset, Higher-magnification view of Hrs/Rab35 colocalization on an enlarged endosome created by Rab35 overexpression. K, Super-resolution images of neurons cotransfected with Rab35 and CHMP2B-mCh. Outline of axons is shown. Inset, Higher-magnification view of a Rab35-positive endosome and juxtaposed CHMP2B-mCh puncta. Scale bars: 5 μm, inset, 2.5 μm. Patricia Sheehan et al. J. Neurosci. 2016;36:8668-8686 ©2016 by Society for Neuroscience