A cascading activity-based probe sequentially targets E1-E2-E3 ubiquitin enzymes.

A cascading activity-based probe sequentially targets E1-E2-E3 ubiquitin enzymes.
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DOI:
10.1038/nchembio.2084
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发表时间:
2016-07
影响因子:
14.8
通讯作者:
Ovaa, Huib
Ovaa, Huib
中科院分区:
生物学1区
文献类型:
--
作者:
Mulder, Monique P. C.;Witting, Katharina;Berlin, Ilana;Pruneda, Jonathan N.;Wu, Kuen-Phon;Chang, Jer-Gung;Merkx, Remco;Bialas, Johanna;Groettrup, Marcus;Vertegaal, Alfred C. O.;Schulman, Brenda A.;Komander, David;Neefjes, Jacques;El Oualid, Farid;Ovaa, Huib

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Post-translational modifications of proteins with ubiquitin (Ub) and ubiquitin-like (Ubl) modifiers, orchestrated by a cascade of specialized E1, E2 and E3 enzymes, control a staggering breadth of cellular processes. To monitor catalysis along these complex reaction pathways, we developed a cascading activity-based probe, UbDha. Akin to the native Ub, upon ATP-dependent activation by the E1, UbDha can travel downstream to the E2 (and subsequently E3) enzymes through sequential trans-thioesterifications. Unlike the native Ub, at each step along the cascade UbDha has the option to react irreversibly with active site cysteine residues of target enzymes, thus enabling their detection. We show that our cascading probe ‘hops’ and ‘traps’ catalytically active ubiquitin-modifying enzymes (but not their substrates) by a mechanism diversifiable to Ubls. Our founder methodology, amenable to structural studies, proteome-wide profiling and monitoring of enzymatic activities in living cells, presents novel and versatile tools to interrogate the Ub/Ubl cascades.
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