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Destabilization of mutated human PUS3 protein causes intellectual disability

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cris.lastimport.scopus2024-02-12T20:35:47Z
dc.abstract.enPseudouridine (Ψ) is an RNA base modification ubiquitously found in many types of RNAs. In humans, the isomerization of uridine is catalyzed by different stand-alone pseudouridine synthases (PUS). Genomic mutations in the human pseudouridine synthase 3 gene (PUS3) have been identified in patients with neurodevelopmental disorders. However, the underlying molecular mechanisms that cause the disease phenotypes remain elusive. Here, we utilize exome sequencing to identify genomic variants that lead to a homozygous amino acid substitution (p.[(Tyr71Cys)];[(Tyr71Cys)]) in human PUS3 of two affected individuals and a compound heterozygous substitution (p.[(Tyr71Cys)];[(Ile299Thr)]) in a third patient. We obtain wild-type and mutated full-length human recombinant PUS3 proteins and characterize the enzymatic activity in vitro. Unexpectedly, we find that the p.Tyr71Cys substitution neither affect tRNA binding nor pseudouridylation activity in vitro, but strongly impair the thermostability profile of PUS3, while the p.Ile299Thr mutation causes protein aggregation. Concomitantly, we observe that the PUS3 protein levels as well as the level of PUS3-dependent Ψ levels are strongly reduced in fibroblasts derived from all three patients. In summary, our results directly illustrate the link between the identified PUS3 variants and reduced Ψ levels in the patient cells, providing a molecular explanation for the observed clinical phenotypes.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKuźniewska, Bożena
dc.contributor.authorDziembowska, Magdalena
dc.contributor.authorGlatt, Sebastian
dc.contributor.authorPloski, Rafał
dc.contributor.authorRzonca‐Niewczas, Sylwia
dc.contributor.authorGos, Monika
dc.contributor.authorNowak, Jakub
dc.contributor.authorJeżowski, Jakub
dc.contributor.authorChramiec‐Głąbik, Andrzej
dc.contributor.authorLaczmanska, Izabela
dc.contributor.authorDobosz, Dominika
dc.contributor.authorKościelniak, Anna
dc.contributor.authorBiela, Anna
dc.contributor.authorBiela, Mateusz
dc.contributor.authorKosińska, Joanna
dc.contributor.authorChmielewska, Joanna J.
dc.contributor.authorSmigiel, Robert
dc.contributor.authorLin, Ting‐Yu
dc.date.accessioned2024-01-24T21:35:50Z
dc.date.available2024-01-24T21:35:50Z
dc.date.issued2022
dc.description.financePublikacja bezkosztowa
dc.description.number12
dc.description.volume43
dc.identifier.doi10.1002/HUMU.24471
dc.identifier.issn1059-7794
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/104617
dc.identifier.weblinkhttps://onlinelibrary.wiley.com/doi/pdf/10.1002/humu.24471
dc.languageeng
dc.pbn.affiliationbiological sciences
dc.relation.ispartofHuman Mutation
dc.relation.pages2063-2078
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleDestabilization of mutated human PUS3 protein causes intellectual disability
dc.typeJournalArticle
dspace.entity.typePublication