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The chaperonin-containing TCP-1 (CCT), found in the eukaryotic cytosol, is currently the focus of extensive research, CCT isolated from mouse testis lysate sediments at 20S in a sucrose gradient and accounts for about 70% of the total protein in this fraction. We intend to identify all the other proteins that copurify with CCT and to compile a reference profile for future studies. Their identification can be accelerated by a combination of protease digestion, matrix-assisted laser desorption-mass spectrometry, and database matching known as peptide mass fingerprinting. We applied this strategy to 32 polypeptides resolved by 2-dimensional gel electrophoresis, and 23 known proteins and 6 novel proteins were identified. We analyzed isoelectric variants of the CCT subunits and differences in the peptide mass spectra of two CCT theta isoforms indicated a novel posttranslational modification of this subunit.
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