Volume 6, Issue 18 p. 4978-4986
Clinical Applications

Profiling human brain proteome by multi-dimensional separations coupled with MS

Young Mok Park

Young Mok Park

Proteomics Team, Korea Basic Science Institute, Daejeon, Republic of Korea

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Jin Young Kim

Jin Young Kim

Proteomics Team, Korea Basic Science Institute, Daejeon, Republic of Korea

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Kyung-Hoon Kwon

Kyung-Hoon Kwon

Mass Spectrometer Development Team, Korea Basic Science Institute, Daejeon, Republic of Korea

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Sang Kwang Lee

Sang Kwang Lee

Proteomics Team, Korea Basic Science Institute, Daejeon, Republic of Korea

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Young Hye Kim

Young Hye Kim

Proteomics Team, Korea Basic Science Institute, Daejeon, Republic of Korea

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Se-Young Kim

Se-Young Kim

Proteomics Team, Korea Basic Science Institute, Daejeon, Republic of Korea

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Gun Wook Park

Gun Wook Park

Mass Spectrometer Development Team, Korea Basic Science Institute, Daejeon, Republic of Korea

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Jeong Hwa Lee

Jeong Hwa Lee

Proteomics Team, Korea Basic Science Institute, Daejeon, Republic of Korea

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Bonghee Lee

Bonghee Lee

Department of Anatomy and Neurobiology, College of Medicine, Cheju National University, Jeju, Republic of Korea

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Jong Shin Yoo Dr.

Corresponding Author

Jong Shin Yoo Dr.

Mass Spectrometer Development Team, Korea Basic Science Institute, Daejeon, Republic of Korea

Mass Spectrometer Development Team, Korea Basic Science Institute, 52 Yeoeun-dong, Yusung-gu, Daejeon 305–333, Republic of Korea Fax: +82-42-865-3419===Search for more papers by this author
First published: 11 September 2006
Citations: 33

Abstract

In our initial attempt to analyze the human brain proteome, we applied multi-dimensional protein separation and identification techniques using a combination of sample fractionation, 1-D SDS-PAGE, and MS analysis. The complexity of human brain proteome requires multiple fractionation strategies to extend the range and total number of proteins identified. According to the method of Klose (Methods Mol. Biol. 1999, 112, 67), proteins of the temporal lobe of human brain were fractionated into (i) cytoplasmic and nucleoplasmic, (ii) membrane and other structural, and (iii) DNA-binding proteins. Each fraction was then separated by SDS-PAGE, and the resulting gel line was cut into approximately 50 bands. After trypsin digestion, the resulting peptides from each band were analyzed by RP-LC/ESI-MS/MS using an LTQ spectrometer. The SEQUEST search program, which searched against the IPI database, was used for peptide sequence identification, and peptide sequences were validated by reversed sequence database search and filtered by the Protein Hit Score. Ultimately, 1533 proteins could be detected from the human brain. We classified the identified proteins according to their distribution on cellular components. Among these proteins, 24% were membrane proteins. Our results show that the multiple separation strategy is effective for high-throughput characterization of proteins from complex proteomic mixtures.