Proteomics

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TMT isobaric profiling of PPIA heterozygous versus knockout haematopoietic stem cells

ABSTRACT: Mass spectrometry was performed with an Orbitrap Fusion Tribrid mass spectrometer (Thermo Scientific) interfaced with an UltiMate 3000 Binary RSLCnano System (Dionex). Proteome Discoverer v.1.4 (Thermo Scientific) with SEQUEST HT search engines was used for the spectra-preprocessing and HCD MS2 spectra were used for peptide identification and quantitation based on TMT reporter ions. TMT isobaric comparison of Ppia heterozygous (het) versus knockout (KO) haematopoietic stem and progenitor cells. Het 1 is sample 126 and KO 1 is sample 131 of dataset UTH_2. Het 2 and KO 2 are samples 126 and 127 of UTH_4. Het 3 and KO 3 are samples 130 and 127 of dataset UTH_3.

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Mus Musculus (ncbitaxon:10090)

SUBMITTER: Andre Catic  

PROVIDER: MSV000093127 | MassIVE | Mon Oct 16 17:05:00 BST 2023

SECONDARY ACCESSION(S): PXD046247

REPOSITORIES: MassIVE

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Loss of protein function is a driving force of ageing. We have identified peptidyl-prolyl isomerase A (PPIA or cyclophilin A) as a dominant chaperone in haematopoietic stem and progenitor cells. Depletion of PPIA accelerates stem cell ageing. We found that proteins with intrinsically disordered regions (IDRs) are frequent PPIA substrates. IDRs facilitate interactions with other proteins or nucleic acids and can trigger liquid-liquid phase separation. Over 20% of PPIA substrates are involved in t  ...[more]

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