PXD018617

PXD018617 is an original dataset announced via ProteomeXchange.

Title	Allosteric HSP70 inhibitors perturb mitochondrial proteostasis and overcome proteasome inhibitor resistance in multiple myeloma, dataset 2
Description	Proteasome inhibitor (PI) resistance remains a central challenge in multiple myeloma. To identify pathways mediating this resistance, we mapped genetic co-dependencies associated with the proteasome. These studies identified cytosolic heat shock protein 70 (HSP70) chaperones as a potential target, mirroring recent studies that have shown mechanism of overcoming PI-induced stress. Here, we first underscore this relationship by mapping genetic co-dependencies in cancer proteostasis. These results lead us to explore HSP70 inhibitors as potential therapeutics. We show these compounds exhibit increased efficacy against both acquired and intrinsic PI-resistant myeloma models, unlike HSP90 inhibition. Surprisingly, shotgun and pulsed-SILAC proteomics reveal that JG’s overcome PI resistance not via the expected mechanism of inhibiting cytosolic HSP70s, but instead through mitochondrial-localized HSP70, HSPA9, destabilizing the 55S mitoribosome. Analysis of myeloma patient data further supports strong effects of global proteostasis capacity, and particularly HSPA9 expression, on response to PI. Our results characterize dynamics of myeloma proteostasis networks under therapeutic pressure while further motivating investigation of HSPA9 as a specific target in PI-resistant disease. This dataset corresponds to experiment outlined in figure 4a.
HostingRepository	PRIDE
AnnounceDate	2020-04-24
AnnouncementXML	Submission_2020-04-24_02:09:24.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Ian Ferguson
SpeciesList	scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	acetylated residue; monohydroxylated residue
Instrument	Q Exactive

Revision	Datetime	Status	ChangeLog Entry
0	2020-04-17 01:10:15	ID requested
⏵ 1	2020-04-24 02:09:25	announced

Dataset with its publication pending

submitter keyword: multiple myeloma, HSP70, TMT

Arun Wiita
contact affiliation	Department of Laboratory Medicine, Wiita Lab, University of California, San Francisco, USA
contact email	arun.wiita@ucsf.edu
lab head
Ian Ferguson
contact affiliation	Stanford University
contact email	ifergus@stanford.edu
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD018617
     1. Label: PRIDE project
     2. Name: Allosteric HSP70 inhibitors perturb mitochondrial proteostasis and overcome proteasome inhibitor resistance in multiple myeloma, dataset 2