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Cell Syst. 2017 Feb 22;4(2):242-250.e4. doi: 10.1016/j.cels.2017.01.002. Epub 2017 Jan 25.

In Situ Peroxidase Labeling and Mass-Spectrometry Connects Alpha-Synuclein Directly to Endocytic Trafficking and mRNA Metabolism in Neurons.

Author information

1
Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA. Electronic address: cychung@yumanity.com.
2
Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Ann Romney Center for Neurologic Disease, Department of Neurology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA; Harvard Stem Cell Institute, Cambridge, MA 02138, USA. Electronic address: vkhurana@bwh.harvard.edu.
3
Center for Cancer Systems Biology (CCSB) and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215; Department of Genetics, Harvard Medical School, Boston, MA 02115, USA.
4
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
5
Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA.
6
The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
7
Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Howard Hughes Medical Institute, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Abstract

Synucleinopathies, including Parkinson's disease (PD), are associated with the misfolding and mistrafficking of alpha-synuclein (α-syn). Here, using an ascorbate peroxidase (APEX)-based labeling method combined with mass spectrometry, we defined a network of proteins in the immediate vicinity of α-syn in living neurons to shed light on α-syn function. This approach identified 225 proteins, including synaptic proteins, proteins involved in endocytic vesicle trafficking, the retromer complex, phosphatases and mRNA binding proteins. Many were in complexes with α-syn, and some were encoded by genes known to be risk factors for PD and other neurodegenerative diseases. Endocytic trafficking and mRNA translation proteins within this spatial α-syn map overlapped with genetic modifiers of α-syn toxicity, developed in an accompanying study (Khurana et al., this issue of Cell Systems). Our data suggest that perturbation of these particular pathways is directly related to the spatial localization of α-syn within the cell. These approaches provide new avenues to systematically examine protein function and pathology in living cells.

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