Mechanistic studies of RNA modifying enzymes. RNA pseudouridine synthase and m5Cytosine methyl tranferase
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چکیده
منابع مشابه
Eukaryotic stand-alone pseudouridine synthases – RNA modifying enzymes and emerging regulators of gene expression?
For a long time, eukaryotic stand-alone pseudouridine synthases (Pus enzymes) were neglected as non-essential enzymes adding seemingly simple modifications to tRNAs and small nuclear RNAs. Most studies were limited to the identification and initial characterization of the yeast Pus enzymes. However, recent transcriptome-wide mapping of pseudouridines in yeast and humans revealed pervasive modif...
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Pseudouridine (Psi) synthases catalyze the isomerization of specific uridines in cellular RNAs to pseudouridines and may function as RNA chaperones. TruB is responsible for the Psi residue present in the T loops of virtually all tRNAs. The close homolog Cbf5/dyskerin is the catalytic subunit of box H/ACA snoRNPs. These carry out the pseudouridylation of eukaryotic rRNA and snRNAs. The 1.85 A re...
متن کاملStructural mechanism of substrate RNA recruitment in H/ACA RNA-guided pseudouridine synthase.
H/ACA RNAs form ribonucleoprotein complex (RNP) with proteins Cbf5, Nop10, L7Ae, and Gar1 and guide site-specific conversion of uridine into pseudouridine in cellular RNAs. The crystal structures of H/ACA RNP with substrate bound at the active site cleft reveal that the substrate is recruited through sequence-specific pairing with guide RNA and essential protein contacts. Substrate binding lead...
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Pseudouridines are found in virtually all ribosomal RNAs but their function is unknown. There are four to eight times more pseudouridines in eukaryotes than in eubacteria. Mapping 19 Haloarcula marismortui pseudouridines on the three-dimensional 50S subunit does not show clustering. In bacteria, specific enzymes choose the site of pseudouridine formation. In eukaryotes, and probably also in arc...
متن کاملCorrection: Steroid Receptor RNA Activator (SRA) Modification by the Human Pseudouridine Synthase 1 (hPus1p): RNA Binding, Activity, and Atomic Model
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ژورنال
عنوان ژورنال: Nucleic Acids Symposium Series
سال: 2000
ISSN: 0261-3166,1746-8272
DOI: 10.1093/nass/44.1.147