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- W2026902836 abstract "Many cellular processes are driven by protein complexes. Although the identification of protein components in such complexes has become almost a routine matter, accurate determination of their stoichiometry within a protein complex is still a challenge. We have established a method to determine the stoichiometries of protein complexes using absolute quantification (AQUA) with the help of synthetic standard peptides in combination with multiple reaction monitoring (MRM). Our approach is exemplified by the analysis of the human spliceosomal hPrp19/CDC5L complex, which consists of seven individual proteins and plays a crucial role in the assembly of the fully catalytically active spliceosome during pre-mRNA splicing. We evaluated several conditions for complete hydrolysis of the protein complex and found that the denaturing conditions under which hydrolysis is performed are absolutely crucial for accurately determining protein stoichiometries within this complex. In addition, we tested the suitability of different AQUA peptides and further compared different MS techniques to read out the relative signal intensities that were then used in absolute quantification. Our analyses revealed that dependent on the denaturing conditions different stoichiometries within the complex were obtained. The most consistent results were obtained by enzymatic hydrolysis in the presence of acetonitrile in combination with MRM." @default.
- W2026902836 created "2016-06-24" @default.
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- W2026902836 date "2010-03-12" @default.
- W2026902836 modified "2023-10-10" @default.
- W2026902836 title "Determination of Protein Stoichiometry within Protein Complexes Using Absolute Quantification and Multiple Reaction Monitoring" @default.
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- W2026902836 doi "https://doi.org/10.1021/ac902710k" @default.
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