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PXD030405

PXD030405 is an original dataset announced via ProteomeXchange.

Dataset Summary
TitleProteomic characterization of Hsp78-interacting proteins highlights chaperone role during protein aggregation in mitochondria under heat stress - Part A Protein Interactions
DescriptionChaperones of the Hsp100 chaperone family support protein homeostasis, the maintenance of protein activity under stress, by refolding aggregated proteins or targeting them for degradation. Hsp78, the ClpB-type mitochondrial member of the Hsp100 family, can be found in lower eukaryotes like yeast. Although Hsp78 has been shown to contribute to protection against elevated temperatures in yeast, the biochemical mechanisms underlying this mitochondria-specific thermotolerance are still largely unclear. To identify endogenous chaperone substrate proteins, we generated an Hsp78-ATPase mutant with a stabilized substrate binding behavior. We used two SILAC-based quantitative mass spectrometry approaches to analyze the role of Hsp78 during heat stress-induced mitochondrial protein aggregation and disaggregation processes on a proteomic level. In the first setup, Hsp78-interacting polypeptides were identified to reveal the endogenous substrate spectrum of the chaperone. Our analysis revealed that Hsp78 is interacting with a wide variety of proteins related to metabolic functions including energy production and protein synthesis, as well as other chaperones, thus maintaining crucial functions for mitochondrial stress resistance. We compared these interaction data with a second experimental setup that focused on the on overall aggregation and disaggregation processes in mitochondria under heat stress on a proteomic level. This revealed specific aggregation-prone protein populations and demonstrated the direct quantitative impact of Hsp78 on stress-dependent protein solubility different conditions and. We conclude that Hsp78 together with its cofactors represents a recovery system that protects major mitochondrial metabolic functions during as well restores protein biogenesis capacity after heat stress.
HostingRepositoryPRIDE
AnnounceDate2024-10-07
AnnouncementXMLSubmission_2024-10-07_13:44:26.398.xml
DigitalObjectIdentifierhttps://dx.doi.org/10.6019/PXD030405
ReviewLevelPeer-reviewed dataset
DatasetOriginOriginal dataset
RepositorySupportSupported dataset by repository
PrimarySubmitterMarc Sylvester
SpeciesList scientific name: Saccharomyces cerevisiae (Baker's yeast); NCBI TaxID: 4932;
ModificationListS-carboxamidoethyl-L-cysteine; 6x(13)C; (4,4,5,5-(2)H4)-L-lysine; isotope labeled residue
InstrumentLTQ Orbitrap Velos
Dataset History
RevisionDatetimeStatusChangeLog Entry
02021-12-14 10:00:09ID requested
12024-10-07 13:44:26announced
Publication List
10.1016/J.JBC.2022.102494;
10.6019/PXD030405;
Keyword List
submitter keyword: Yeast
cell biology
mitochondria
heat stress
protein aggregation
proteostasis
chaperone
Hsp78
Contact List
Wolfgang Voos
contact affiliationInstitute of Biochemistry and Molecular Biology (IBMB), Faculty of Medicine, University of Bonn, Nussallee 11, 53115 Bonn, Germany
contact emailwolfgang.voos@uni-bonn.de
lab head
Marc Sylvester
contact affiliationInstitute of Biochemistry and Molecular Biology, Medical Faculty, University of Bonn
contact emailmsylvest@uni-bonn.de
dataset submitter
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