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PXD020870-1

PXD020870 is an original dataset announced via ProteomeXchange.

Dataset Summary
TitleNuclear phosphatidylinositol (3,4,5) triphosphate interactome uncovers an enrichment in nucleolar proteins
DescriptionPolyphosphoinositides (PPIn) play essential functions as lipid signalling molecules and many of their functions have been elucidated in the cytoplasm. However, PPIns are also intranuclear where they contribute to chromatin remodelling, transcription and mRNA splicing. The PPIn, phosphatidylinositol 3,4,5-triphosphate (PtdIns(3,4,5)P3) has been mapped to the nucleus and nucleoli but its role remains unclear in this subcellular compartment. To gain further insights into the nuclear functions of PtdIns(3,4,5)P3, we applied a previously developed quantitative mass spectrometry-based approach to identify the targets of PtdIns(3,4,5)P3 from isolated nuclei. We identified 179 potential PtdIns(3,4,5)P3-interacting proteins and gene ontology analysis for the biological functions of this dataset revealed an enrichment in RNA processing/splicing, cytokinesis, protein folding and DNA repair. Interestingly, about half of these interactors were common to nucleolar protein datasets, some of which had dual functions in rRNA transcription and DNA repair, including Poly(ADP-Ribose) Polymerase 1 (PARP1),. PARP1 was found to interact directly with PPIns and to co-localise with PtdIns(3,4,5)P3 in the nucleolus. Focusing on another factor involved in RNA processing, heterogeneous nuclear ribonucleoprotein U (hnRNPU/SAF-A) was also identified and validated as a direct PPIn-interacting protein. Deletion of the polybasic motif in its DNA binding domain prevented PPIn interaction. In conclusion, the PtdIns(3,4,5)P3 interactome reported here identified several nucleolar proteins and splicing factors and further pointed to roles for this lipid in these processes.
HostingRepositoryPRIDE
AnnounceDate2021-06-28
AnnouncementXMLSubmission_2021-06-27_23:41:15.473.xml
DigitalObjectIdentifier
ReviewLevelPeer-reviewed dataset
DatasetOriginOriginal dataset
RepositorySupportUnsupported dataset by repository
PrimarySubmitterEvangelia Papachristou
SpeciesList scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationListmonohydroxylated residue; iodoacetamide derivatized residue; deamidated residue
InstrumentQ Exactive HF
Dataset History
RevisionDatetimeStatusChangeLog Entry
02020-08-12 04:51:13ID requested
12021-06-27 23:41:15announced
Publication List
Dataset with its publication pending
Keyword List
submitter keyword: Nuclear phosphoinisitides, nucleolus, PtdIns (3,4,5)P3 interactome, Poly(ADP-Ribose) Polymerase 1 (PARP1), heterogeneous nuclear ribonucleoprotein U (hnRNPU/SAF-A)
Contact List
Aurélia E. Lewis
contact affiliationUniversity of Bergen
contact emailAurelia.Lewis@uib.no
lab head
Evangelia Papachristou
contact affiliationSenior Scientific Assistant
contact emailEva.Papachristou@cruk.cam.ac.uk
dataset submitter
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