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A strategy for modulation of enzymes in the ubiquitin system.

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TLDR
This work used massively diverse combinatorial libraries of ubiquitin variants to develop inhibitors of four deubiquitinases (DUBs) and analyzed the DUB-inhibitor complexes with crystallography to report a method to target the myriad enzymes that govern ubiquitination of protein substrates.
Abstract
The ubiquitin system regulates virtually all aspects of cellular function. We report a method to target the myriad enzymes that govern ubiquitination of protein substrates. We used massively diverse combinatorial libraries of ubiquitin variants to develop inhibitors of four deubiquitinases (DUBs) and analyzed the DUB-inhibitor complexes with crystallography. We extended the selection strategy to the ubiquitin conjugating (E2) and ubiquitin ligase (E3) enzymes and found that ubiquitin variants can also enhance enzyme activity. Last, we showed that ubiquitin variants can bind selectively to ubiquitin-binding domains. Ubiquitin variants exhibit selective function in cells and thus enable orthogonal modulation of specific enzymatic steps in the ubiquitin system.

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References
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ProHits: integrated software for mass spectrometry-based interaction proteomics

TL;DR: ProHits is a complete open source software solution for MS-based interaction proteomics that manages the entire pipeline from raw MS data files to fully annotated protein-protein interaction datasets and can accommodate multiple instruments within a facility, multiple user groups, multiple laboratory locations, and any number of parallel projects.
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Structural Basis of Ubiquitin Recognition by the Deubiquitinating Protease USP2

TL;DR: A general mechanism of water-mediated ubiquitin recognition by USPs is suggested, as several of those molecules are found at identical positions in the previously solved USP7/ubiquitin-aldehyde complex structure.
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Targeting the ubiquitin-proteasome system for cancer therapy.

TL;DR: A broad overview of the ubiquitin–proteasome system and its role in supporting cancer development and progression is provided, especially in aspects of p53 inactivation, p27 turnover and NF-κB activation.
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HAUSP is required for p53 destabilization.

TL;DR: It is demonstrated that MDM2, rather than p53, is the substrate for HAUSP under physiologic conditions and a fascinating and unexpected twist to the regulation of the p53/MDM2 axis is document.
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E2s: structurally economical and functionally replete.

TL;DR: The prototypical E2-E3 interface is described and the limitations of current methods to identify cognate E3 partners are discussed, highlighting the economy of E2s in their ability to facilitate many protein-protein interactions at nearly every surface on their relatively small and compact catalytic domain.
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