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Originally published In Press as doi:10.1074/mcp.D500009-MCP200 on February 28, 2006.
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Molecular & Cellular Proteomics 5:1158-1170, 2006.
© 2006 by The American Society for Biochemistry and Molecular Biology, Inc.

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Relative and Absolute Quantification of Postsynaptic Density Proteome Isolated from Rat Forebrain and Cerebellum*,S

Dongmei Chenga,b, Casper C. Hoogenraadb,c,d,e, John Rushf, Elizabeth Rammc, Max A. Schlagerd,g, Duc M. Duonga, Ping Xua, Sameera R. Wijayawardanah, John Hanfelth, Terunaga Nakagawac, Morgan Shengc,i and Junmin Penga,j

From the a Department of Human Genetics, Center for Neurodegenerative Disease, and h Department of Biostatistics, Emory University, Atlanta, Georgia 30322, c The Picower Center for Learning and Memory, RIKEN-MIT Neuroscience Research Center, Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, d Department of Neuroscience, Erasmus Medical Center, P. O. Box 1738, 3000 DR Rotterdam, The Netherlands, and f Cell Signaling Technology, Inc., Beverly, Massachusetts 01915

The postsynaptic density (PSD) of central excitatory synapses is essential for postsynaptic signaling, and its components are heterogeneous among different neuronal subtypes and brain structures. Here we report large scale relative and absolute quantification of proteins in PSDs purified from adult rat forebrain and cerebellum. PSD protein profiles were determined using the cleavable ICAT strategy and LC-MS/MS. A total of 296 proteins were identified and quantified with 43 proteins exhibiting statistically significant abundance change between forebrain and cerebellum, indicating marked molecular heterogeneity of PSDs between different brain regions. Moreover we utilized absolute quantification strategy, in which synthetic isotope-labeled peptides were used as internal standards, to measure the molar abundance of 32 key PSD proteins in forebrain and cerebellum. These data confirm the abundance of calcium/calmodulin-dependent protein kinase II and PSD-95 and reveal unexpected stoichiometric ratios between glutamate receptors, scaffold proteins, and signaling molecules in the PSD. Our data also demonstrate that the absolute quantification method is well suited for targeted quantitative proteomic analysis. Overall this study delineates a crucial molecular difference between forebrain and cerebellar PSDs and provides a quantitative framework for measuring the molecular stoichiometry of the PSD.

i To whom correspondence may be addressed. Tel.: 404-712-8510; Fax: 404-727-3728; E-mail: jpeng{at}genetics.emory.edu


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