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VCP–adaptor interactions are exceptionally dynamic and subject to differential modulation by a VCP inhibitor

ABSTRACT: In this study we use a combination of mass spectrometry-based proteomics and biophysical studies to characterize the interaction of adaptors with VCP. Our results reveal that most VCP–adaptor interactions are characterized by exceptionally rapid dynamics that in some cases are modulated by the VCP inhibitor NMS873. These findings have significant implications for both the regulation of VCP function and the impact of VCP inhibition on different VCP–adaptor complexes.

INSTRUMENT(S): LTQ Orbitrap Elite

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Liang Xue

LAB HEAD: Raymond Deshaies

PROVIDER: PXD004105 | Pride | 2016-07-18

REPOSITORIES: Pride

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Publications

Valosin-containing protein (VCP)-Adaptor Interactions are Exceptionally Dynamic and Subject to Differential Modulation by a VCP Inhibitor.

Xue Liang L Blythe Emily E EE Freiberger Elyse C EC Mamrosh Jennifer L JL Hebert Alexander S AS Reitsma Justin M JM Hess Sonja S Coon Joshua J JJ Deshaies Raymond J RJ

Molecular & cellular proteomics : MCP 20160712 9

Protein quality control (PQC) plays an important role in stemming neurodegenerative diseases and is essential for the growth of some cancers. Valosin-containing protein (VCP)/p97 plays a pivotal role in multiple PQC pathways by interacting with numerous adaptors that link VCP to specific PQC pathways and substrates and influence the post-translational modification state of substrates. However, our poor understanding of the specificity and architecture of the adaptors, and the dynamic properties ...[more]

PMID: 27406709

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Endoplasmic reticulum di-glycine modified proteome under p97/VCP inhibition

Project description:Endoplasmic reticulum (ER)-associated degradation (ERAD) mediates the proteasomal clearance of proteins from the early secretory pathway. In this process, ubiquitinated substrates are extracted from membrane-embedded dislocation complexes by the AAA ATPase VCP and targeted to the cytosolic 26S proteasome. In addition to its well-established role in the degradation of misfolded proteins, ERAD also regulates the abundance of key proteins such as enzymes involved in cholesterol synthesis. However, due to the lack of generalizable methods, our understanding of the scope of proteins regulated targeted by ERAD remains limited. To overcome this obstacle, we developed a VCP-inhibitor substrate trapping approach (VISTA) to identify endogenous ERAD substrates. VISTA exploits the small-molecule VCP inhibitor CB5083 to trap ERAD substrates in a membrane-associated, ubiquitinated form.

2018-03-12 | PXD008842 | Pride

RNAi knock down of VCP in human HeLa cells

Project description:Study of the effects of the VCP knockdown. VCP (p97, yeast cdc48) is a hexameric AAA ATPase involved in various cellular functions including degradation of proteins by the ubiquitin-proteasome system. We examine the consequences of the reduction of VCP levels after RNAi of VCP in HeLa cells. We find ~30 transcripts upregulated in a sequence independent manner. Those transcripts encode proteins involved in endoplasmic reticulum stress, apoptosis, and amino acid starvation.

2006-08-23 | E-MEXP-817 | biostudies-arrayexpress

Proteomic profiling of VCP substrates links VCP to K6-linked ubiquitylation and c-Myc function

Project description:VCP is an evolutionary conserved ubiquitin-dependent ATPase that mediates the degradation of proteins through the ubiquitin-proteasome pathway. Despite the central role of VCP in the regulation of protein homeostasis, identity and nature of its cellular substrates remain poorly defined. Here, we combined chemical inhibition of VCP and quantitative ubiquitin remnant profiling to assess the effect of VCP inhibition on the ubiquitin-modified proteome and to probe the substrate spectrum of VCP in human cells. We demonstrate that inhibition of VCP perturbs cellular ubiquitylation and increases ubiquitylation of a different subset of proteins compared to proteasome inhibition. VCP inhibition globally upregulates K6-linked ubiquitylation that is dependent on the HECT-type ubiquitin E3 ligase HUWE1. We report ~450 putative VCP substrates, many of which function in nuclear processes, including gene expression, DNA repair and cell cycle. Moreover, we identify that VCP regulates the level and activity of the transcription factor c-Myc.

2018-02-08 | GSE107313 | GEO

Neuronal VCP loss of function recapitulates FTLD-TDP pathology

Project description:The pathogenic mechanism by which dominant mutations in VCP cause multisystem proteinopathy (MSP), a rare neurodegenerative disease that presents as fronto-temporal lobar degeneration with TDP-43 inclusions (FTLD-TDP), remains unclear. To explore this, we inactivated VCP in murine postnatal forebrain neurons (VCP cKO). VCP cKO mice have cortical brain atrophy, neuronal loss, autophago-lysosomal dysfunction and TDP-43 inclusions resembling FTLD-TDP pathology. Conditional expression of a single disease-associated mutation, VCP-R155C, in a VCP null background similarly recapitulated features of VCP inactivation and FTLD-TDP, suggesting that this MSP mutation is hypomorphic. Comparison of transcriptomic and proteomic datasets from genetically defined patients with FTLD-TDP reveal that progranulin deficiency and VCP insufficiency result in similar profiles. These data identify a loss of VCP-dependent functions as a mediator of FTLD-TDP and reveal an unexpected biochemical similarity with progranulin deficiency.

2021-06-16 | GSE178257 | GEO

Bias in ligation-based small RNA sequencing library construction is determined by adaptor and RNA structure

Project description:High-throughput sequencing (HTS) has become a powerful tool for the detection of and sequence characterization of microRNAs (miRNA) and other small RNAs (sRNA). Unfortunately, the use of HTS data to determine the relative quantity of different miRNAs in a sample has been shown to be inconsistent with quantitative PCR and Northern Blot results. Several recent studies have concluded that the major contributor to this inconsistency is bias introduced during the construction of sRNA libraries for HTS and that the bias is primarily derived from the adaptor ligation steps; specifically where single stranded adaptors are sequentially ligated to the 3' and 5'-end of sRNAs using T4 RNA ligases. In this study we investigated the effects of ligation bias by using a pool of randomized ligation substrates, defined mixtures of miRNA sequences and several combinations of adaptors in HTS library construction. We show that like the 3' adaptor ligation step, the 5' adaptor ligation is also biased, not because of primary sequence, but instead due to secondary structures of the two ligation substrates. We find that multiple secondary structural factors influence final representation in HTS results. Our results provide insight about the nature of ligation bias and allowed us to design adaptors that reduce ligation bias and produce HTS results that more accurately reflect the actual concentrations of miRNAs in the defined starting material. 28 samples were sequenced and the libraries were made using various synthetic oligo mixtures and adaptor combinations

2015-05-15 | E-GEOD-67053 | biostudies-arrayexpress

The differentiation/retrodifferentiation program of human U937 leukemia cells is accompanied by changes of VCP/p97

Project description:A possible functional role of VCP/p97 during differentiation of U937 cells was addressed by siRNA-targeting of VCP/p97. Functional changes in VCP-siRNA-transfected cells following phorbol ester-induced monocytic differentiation have been examind by DNA microarray analysis. Cells transfected with the non-targeting AllStars negative siRNA (Qiagen) served as a reference. Computed

2010-06-29 | E-GEOD-9821 | biostudies-arrayexpress

Bias in ligation-based small RNA sequencing library construction is determined by adaptor and RNA structure

2015-05-15 | GSE67053 | GEO

ASPSCR1-TFE3 reprograms transcription by organizing enhancers around hexameric VCP [HiChIP]

Project description:ChIPseq experiments identify that ASPSCR1-TFE3 defines active enhancers across the genome and co-distributes with VCP/p97. RNAseq after knock-down of ASPSCR1-TFE3 or VCP, inhibition of VCP, or overexpression of each in alveolar soft part sarcoma cell lines demonstrates their co-dependence. HiChIP defines chromatin conformations that surround ASPSCR1-TFE3 targets and are lost on VCP knock-down.

2023-01-01 | GSE162068 | GEO

ASPSCR1-TFE3 reprograms transcription by organizing enhancers around hexameric VCP [ASPS1 VCP ChIP]

Project description:Aberrant transcription in alveolar soft part sarcoma (ASPS) is orchestrated by the fusion oncoprotein, ASPSCR1-TFE3, product of a gene fusion created by a t(X;17) chromosomal translocation. Here, proteomics of proteins co-immunoprecipitating with ASPSCR1-TFE3 revealed strong enrichment of VCP/p97, an AAA+ ATPase with known segregase function. Positive and negative genetic experiments with ASPSCR1-TFE3 and VCP demonstrated that they function co-dependently for cancer cell proliferation, colony formation, enhancer activation, chromatin conformation, and transcription

2023-01-01 | GSE162727 | GEO

ASPSCR1-TFE3 reprograms transcription by organizing enhancers around hexameric VCP [Cell_lines_ChIP, ASPS1]

2023-01-01 | GSE162483 | GEO