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Identification and Characterization of Dual Inhibitors of the USP25/28 Deubiquitinating Enzyme Subfamily.

Abstract：

:The ubiquitin proteasome system is widely postulated to be a new and important field of drug discovery for the future, with the ubiquitin specific proteases (USPs) representing one of the more attractive target classes within the area. Many USPs have been linked to critical axes for therapeutic intervention, and the finding that USP28 is required for c-Myc stability suggests that USP28 inhibition may represent a novel approach to targeting this so far undruggable oncogene. Here, we describe the discovery of the first reported inhibitors of USP28, which we demonstrate are able to bind to and inhibit USP28, and while displaying a dual activity against the closest homologue USP25, these inhibitors show a high degree of selectivity over other deubiquitinases (DUBs). The utility of these compounds as valuable probes to investigate and further explore cellular DUB biology is highlighted by the demonstration of target engagement against both USP25 and USP28 in cells. Furthermore, we demonstrate that these inhibitors are able to elicit modulation of both the total levels and the half-life of the c-Myc oncoprotein in cells and also induce apoptosis and loss of cell viability in a range of cancer cell lines. We however observed a narrow therapeutic index compared to a panel of tissue-matched normal cell lines. Thus, it is hoped that these probes and data presented herein will further advance our understanding of the biology and tractability of DUBs as potential future therapeutic targets.

journal_name

ACS Chem Biol

journal_title

ACS chemical biology

authors

Wrigley JD,Gavory G,Simpson I,Preston M,Plant H,Bradley J,Goeppert AU,Rozycka E,Davies G,Walsh J,Valentine A,McClelland K,Odrzywol KE,Renshaw J,Boros J,Tart J,Leach L,Nowak T,Ward RA,Harrison T,Andrews DM

doi

10.1021/acschembio.7b00334

subject

Has Abstract

pub_date

2017-12-15 00:00:00

pages

3113-3125

issue

12

eissn

1554-8929

issn

1554-8937

journal_volume

12

pub_type

杂志文章

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