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¹ Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
² Department of Biology, Faculty of Science, Chiba University, Chiba, 263-8522, Japan
³ Department of VCAPP, Washington State University, WA-99164, USA
⁴ Institut für Anästhesiologie und Operative Intensivmedizin, Universitätsklinikum Mannheim, Mannheim 68167, Germany

A comparative proteome analysis of human metaphase chromosomes between a typical epithelial-like cell, HeLa S3, and a lymphoma-type cell, BALL-1, was performed. One-dimensional (1-D) SDS-PAGE and radical-free and highly reducing two-dimensional electrophoresis (RFHR 2-DE) detected more than 200 proteins from chromosomes isolated from HeLa S3 cells, among which 189 proteins were identified by mass spectrometry (MS). Consistent with our recent four-layer structural model of a metaphase chromosome, all the identified proteins were grouped into four distinct levels of abundance. Both HeLa S3 and BALL-1 chromosomes contained specific sets of abundant chromosome structural and peripheral proteins in addition to less abundant chromosome coating proteins (CCPs). Furthermore, titin array analysis and a proteome analysis of the ultra-high molecular mass region indicated an absence of titin with their molecular weight (MW) more than 1000 kDa. Consequently, the present proteome analyses together with previous information on chromosome proteins provide the comprehensive list of proteins essential for the metaphase chromosome architecture.

^aPresent address: Institute for Microbiological Diseases, Osaka University, Suita 565-0871, Japan.

*Correspondence: E-mail: kfukui{at}bio.eng.osaka-u.ac.jp

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