201. The comprehensive native interactome of a fully functional tagged prion protein
- Author
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Anna Maria Calella, Thomas Rülicke, Dorothea Rutishauser, Erich Brunner, Adriano Aguzzi, Rita Moos, Kirsten D. Mertz, University of Zurich, and Rutishauser, D
- Subjects
Multiprotein complex ,PrPSc Proteins ,Chemical Biology/Protein Chemistry and Proteomics ,Immunoprecipitation ,Prions ,animal diseases ,Recombinant Fusion Proteins ,Detergents ,10208 Institute of Neuropathology ,lcsh:Medicine ,610 Medicine & health ,10071 Functional Genomics Center Zurich ,Mice, Transgenic ,1100 General Agricultural and Biological Sciences ,Plasma protein binding ,Biology ,Interactome ,Nervous System ,Neurological Disorders ,Mass Spectrometry ,Mice ,1300 General Biochemistry, Genetics and Molecular Biology ,Biochemistry/Protein Chemistry ,Infectious Diseases/Prion Diseases ,mental disorders ,Animals ,lcsh:Science ,Lipid raft ,Molecular Biology ,1000 Multidisciplinary ,Multidisciplinary ,lcsh:R ,Cell Membrane ,Survival Analysis ,Transport protein ,nervous system diseases ,Protein Transport ,Membrane protein ,Biochemistry ,Isotope Labeling ,570 Life sciences ,biology ,lcsh:Q ,U7 Systems Biology / Functional Genomics ,Neuroscience/Neurobiology of Disease and Regeneration ,Protein Binding ,Research Article - Abstract
The enumeration of the interaction partners of the cellular prion protein, PrPC, may help clarifying its elusive molecular function. Here we added a carboxy proximal myc epitope tag to PrPC. When expressed in transgenic mice, PrPmyc carried a GPI anchor, was targeted to lipid rafts, and was glycosylated similarly to PrPC. PrPmyc antagonized the toxicity of truncated PrP, restored prion infectibility of PrPC-deficient mice, and was physically incorporated into PrPSc aggregates, indicating that it possessed all functional characteristics of genuine PrPC. We then immunopurified myc epitope-containing protein complexes from PrPmyc transgenic mouse brains. Gentle differential elution with epitope-mimetic decapeptides, or a scrambled version thereof, yielded 96 specifically released proteins. Quantitative mass spectrometry with isotope-coded tags identified seven proteins which co-eluted equimolarly with PrPC and may represent component of a multiprotein complex. Selected PrPC interactors were validated using independent methods. Several of these proteins appear to exert functions in axomyelinic maintenance., PLoS ONE, 4 (2), ISSN:1932-6203
- Published
- 2008