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PXD042302-3

PXD042302 is an original dataset announced via ProteomeXchange.

Dataset Summary
TitleMapping of the podocin proximity-dependent proteome reveals novel components of the kidney podocyte foot process.
DescriptionThe unique architecture of glomerular podocytes is integral to kidney filtration. Interdigitating foot processes extend from the podocyte cell body, wrap around fenestrated capillaries, and form specialized junctional complexes termed slit diaphragms to create a molecular sieve. However, the full complement of proteins which maintain foot process integrity, and how this localized proteome changes with disease, remains to be elucidated. Proximity-dependent biotin identification (BioID) enables the identification of spatially localized proteomes. To this end, we developed a novel in vivo BioID knock-in mouse model. We utilized the slit diaphragm protein podocin (Nphs2) to create a podocin-BioID fusion. Podocin-BioID localizes to the slit diaphragm and biotin injection leads to podocyte-specific protein biotinylation. We isolated the biotinylated proteins and performed mass spectrometry to identify proximal interactors. Gene ontology analysis of 54 proteins specifically enriched in our podocin-BioID sample revealed ‘cell junctions’, ‘actin binding’, and ‘cytoskeleton organization’ as top terms. Known foot process components were identified and we further uncovered two novel proteins: the tricellular junctional protein Ildr2 and the CDC42 and N-WASP interactor Fnbp1l. We confirmed Ildr2 and Fnbp1l are expressed by podocytes and partially colocalize with podocin. Finally, we investigated how this proteome changes with age and uncovered a significant increase in Ildr2. This was confirmed by immunofluorescence on human kidney samples and suggests altered junctional composition may preserve podocyte integrity. Together, these assays have led to new insights into podocyte biology and supports the efficacy of utilizing BioID in vivo to interrogate spatially localized proteomes in health, aging, and disease.
HostingRepositoryPRIDE
AnnounceDate2024-10-22
AnnouncementXMLSubmission_2024-10-22_05:50:26.230.xml
DigitalObjectIdentifier
ReviewLevelPeer-reviewed dataset
DatasetOriginOriginal dataset
RepositorySupportUnsupported dataset by repository
PrimarySubmitterGary Gerlach
SpeciesList scientific name: Mus musculus (Mouse); NCBI TaxID: 10090;
ModificationListNo PTMs are included in the dataset
InstrumentQ Exactive HF
Dataset History
RevisionDatetimeStatusChangeLog Entry
02023-05-17 14:09:53ID requested
12023-06-23 09:10:12announced
22023-11-14 09:01:39announced2023-11-14: Updated project metadata.
32024-10-22 05:50:27announced2024-10-22: Updated project metadata.
Publication List
10.3389/fcell.2023.1195037;
Gerlach GF, Imseis ZH, Cooper SL, Santos AN, O'Brien LL, Mapping of the podocin proximity-dependent proteome reveals novel components of the kidney podocyte foot process. Front Cell Dev Biol, 11():1195037(2023) [pubmed]
Keyword List
submitter keyword: Aging, Ildr2, Fnbp1l,Podocytes, BioID Proximity Labeling, Foot Process
Contact List
Lori O'Brien
contact affiliationDepartment of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
contact emaillori_obrien@med.unc.edu
lab head
Gary Gerlach
contact affiliationThe University of North Carolina at Chapel Hill
contact emailgarygerlach@gmail.com
dataset submitter
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