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Discovery of a potent and selective covalent inhibitor and activity-based probe for UCHL1, with anti-fibrotic activity

ABSTRACT: Ubiquitin carboxy-terminal hydrolase L1 (UCHL1) is a deubiquitinating enzyme (DUB) that is very highly expressed in human brain. UCHL1 has been proposed as a potential therapeutic target in neurodegeneration, cancer, and liver and lung fibrosis, however bona fide molecular functions of UCHL1 are yet to be elucidated. Herein we characterize a potent and selective inhibitor and activity-based probe (IMP-1710) for UCHL1 based on a covalent inhibitor scaffold, and its application to identify and quantify target proteins in intact human cells. IMP-1710 stereoselectively labels the catalytic cysteine of UCHL1 at low nanomolar concentration, and we show that a previously claimed UCHL1 inhibitor (LDN-57444) fails to engage UCHL1 in cells. We further demonstrate that potent UCHL1 inhibitors selectively block pro-fibrotic responses in a cellular model of idiopathic pulmonary fibrosis (IPF), supporting a potential therapeutic role for UCHL1 inhibition.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Kidney Epithelial Cell, Cell Culture

SUBMITTER: Nattawadee Panyain

LAB HEAD: Edward W. Tate

PROVIDER: PXD015825 | Pride | 2020-11-12

REPOSITORIES: Pride

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Dataset's files

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			Action	DRS
	2.ABP2targetengagement_MQsearch.zip	Other
	3.Wholeproteomeanalysis_MQsearch.zip	Other
	4.CompetitiveABPP_MQsearch.zip	Other
	Homosapiens_Jan2019.fasta	Fasta
	NP-B224_A-Fr1.raw	Raw

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Project description:Rhinovirus causes the common cold and drives exacerbation in asthma and COPD, leading to substantial morbidity and healthcare cost. The single positive strand RNA genome of this non-enveloped virus is translated into a single polyprotein that is processed by virus 3C protease to form three structural capsid proteins VP0, VP1 and VP3, and other proteins required for viral life cycle completion. Capsid proteins assemble into the 5S capsid protomer, five of which form a 14S pentamer, and 12 pentamers then assemble to form the 150S icosahedral provirion into which the viral genome is incorporated. During the final step of viral maturation, VP0 is cleaved into VP2 and VP4. VP4 is encoded at the N-terminus of the viral polyprotein, and in many Picornaviruses is N-myristoylated by host cell N-myristoyltransferase (NMT). We have explored the impact of IMP-1088 (the first sub-nanomolar IC50 dual inhibitor of human N-myristoyl transferases HsNMT1 and HsNMT2) on HRV capsid myristoylation in cells. Global identification of proteins for which myristoylation is selectively inhibited by IMP-1088 was performed by quantitative chemical proteomic analysis of YnMyr-tagged proteins in HeLa cells infected with RV16 treated with 50 nM IMP-1088 or vehicle (DMSO). Proteins were subjected to ligation to AzRB, an azide capture reagent bearing a trypsin-cleavable linker and biotin dual label followed by affinity enrichment on Neutravidin beads, on-bead digestion with trypsin, nanoLC-MS/MS analysis of tryptic peptides, and data processing by label-free protein quantification (LFQ) in MaxQuant. 60 N-myristoylated proteins were identified, including the RV16 polyprotein which responded to IMP-1088 inhibition, with no significant change in protein abundances across the whole proteome in the presence of inhibitor. The majority of viral capsid peptides identified in the pull-down mapped to the VP0 domain of the polyprotein, and the N-terminal YnMyr-tagged peptide was readily identified by MS/MS. These data provide the first direct evidence for HRV capsid myristoylation in human cells, and demonstrate that this lipid modification is highly susceptible to inhibition by a selective NMT inhibitor.

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Discovery of a potent and selective covalent inhibitor and activity-based probe for UCHL1, with anti-fibrotic activity

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