Systematic and quantitative assessment of the ubiquitin-modified proteome.

Systematic and quantitative assessment of the ubiquitin-modified proteome.
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DOI:
10.1016/j.molcel.2011.08.025
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发表时间:
2011-10-21
期刊:
影响因子:
16
通讯作者:
Gygi SP
Gygi SP
中科院分区:
生物学1区
文献类型:
--
作者:
Kim W;Bennett EJ;Huttlin EL;Guo A;Li J;Possemato A;Sowa ME;Rad R;Rush J;Comb MJ;Harper JW;Gygi SP

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Despite the diverse biological pathways known to be regulated by ubiquitylation, global identification of substrates that are targeted for ubiquitylation has remained a challenge. To globally characterize the ubiquitin-modified proteome (ubiquitinome), we utilized a monoclonal antibody that recognizes diglycine (diGly) containing isopeptides following trypsin digestion. We identify ~19,000 diGly modified lysine residues within ~ 5000 proteins. Using quantitative proteomics we monitored temporal changes in diGly site abundance in response to both proteasomal and translational inhibition indicating both a dependence of on-going translation to observe alterations in site abundance and distinct dynamics of individual modified lysines in response to proteasome inhibition. Further, we demonstrate that quantitative diGly proteomics can be utilized to identify substrates for cullin-RING ubiquitin ligases. Interrogation of the ubiquitinome allows for not only a quantitative assessment of alterations in protein homeostasis fidelity, but also identification of substrates for individual ubiquitin pathway enzymes.
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