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PXD040042

PXD040042 is an original dataset announced via ProteomeXchange.

Dataset Summary
TitleProteome analysis of WT and Borcs5 phagosomes from Raw264.7 macrophages
DescriptionHyperactive TLR7 signaling has long been appreciated as a driver of autoimmune disease in mouse models by breaking tolerance to self-nucleic acids1-5. Recently, the first monogenic mutations within TLR7 or its associated regulator Unc93b16,7 have been identified as causative agents of human lupus. The unifying feature of these mutations is TLR7 gain-of-function resulting from increased ligand binding. TLR7 is an intracellular transmembrane receptor, localized to late endosomes, that senses RNA breakdown products within these hydrolytic compartments8,9. Hence, its function depends on a complex interplay between specialized organelles, transport mechanisms and membrane interactions. Whether perturbations of any of these endosome-related processes can give rise to TLR7 gain-of-function and facilitate self-reactivity has not been investigated. Here we show that a dysregulated endosomal compartment can result in TLR7 gain-of-function and lupus disease in humans. Mechanistically, the late endosomal protein complex BORC-Arl8b controls TLR7 protein levels by mediating the receptor's final sorting step towards lysosomal degradation. A direct interaction between Arl8b and Unc93b1 is required to regulate the turnover of TLR7. We identified an amino acid insertion in Unc93b1 in a patient with childhood-onset lupus, which results in loss of interaction with the BORC-Arl8b complex and an accumulation of functional TLR7. Our results highlight the importance of an intact endomembrane system to prevent autoimmune disease. Disrupting the proper progression of TLR7 through its endocytic life cycle is sufficient to break immunological tolerance to nucleic acids. Our work expands the repertoire of cellular mechanisms important to restrict pathological TLR7 activity. Identifying and stratifying lupus patients based on a TLR7-driven pathology opens the way for precision medicine specifically targeting TLR7.
HostingRepositoryPRIDE
AnnounceDate2023-11-22
AnnouncementXMLSubmission_2023-11-22_04:04:32.351.xml
DigitalObjectIdentifier
ReviewLevelPeer-reviewed dataset
DatasetOriginOriginal dataset
RepositorySupportUnsupported dataset by repository
PrimarySubmitterDavid Meierhofer
SpeciesList scientific name: Mus musculus (Mouse); NCBI TaxID: 10090;
ModificationListiodoacetamide derivatized residue
InstrumenttimsTOF SCP
Dataset History
RevisionDatetimeStatusChangeLog Entry
02023-02-10 08:16:51ID requested
12023-11-22 04:04:32announced
Publication List
Dataset with its publication pending
Keyword List
submitter keyword: Borcs5, phagosomes
Contact List
Olivia Majer
contact affiliationMax Planck Institute for Infection Biology, Berlin, Germany
contact emailmajer@mpiib-berlin.mpg.de
lab head
David Meierhofer
contact affiliationMass Spectrometry Facility MPIMG
contact emailmeierhof@molgen.mpg.de
dataset submitter
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Dataset FTP location
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