Evolutionary appearance of genes encoding proteins associated with box H/ACA snoRNAs: cbf5p in Euglena gracilis, an early diverging eukaryote, and candidate Gar1p and Nop10p homologs in archaebacteria.

Publisher: Oxford University Press Country of Publication: England NLM ID: 0411011 Publication Model: Print Cited Medium: Internet ISSN: 1362-4962 (Electronic) Linking ISSN: 03051048 NLM ISO Abbreviation: Nucleic Acids Res Subsets: MEDLINE

Publication: 1992- : Oxford : Oxford University Press
Original Publication: London, Information Retrieval ltd.

Evolution, Molecular* ; Hydro-Lyases* ; Phylogeny* ; Ribonucleoproteins, Small Nuclear* ; Ribonucleoproteins, Small Nucleolar* ; Saccharomyces cerevisiae Proteins*; Archaea/*genetics ; Archaeal Proteins/*genetics ; Euglena gracilis/*genetics ; Fungal Proteins/*genetics ; Microtubule-Associated Proteins/*genetics ; Nuclear Proteins/*genetics ; RNA, Small Nuclear/*genetics ; RNA-Binding Proteins/*genetics; Amino Acid Sequence ; Animals ; Archaea/classification ; Archaeal Proteins/chemistry ; Base Sequence ; Cloning, Molecular ; Euglena gracilis/classification ; Fungal Proteins/chemistry ; Humans ; Microtubule-Associated Proteins/chemistry ; Molecular Sequence Data ; Nuclear Proteins/chemistry ; Oligodeoxyribonucleotides ; RNA-Binding Proteins/chemistry ; Sequence Alignment ; Sequence Homology, Amino Acid

A reverse transcription-polymerase chain reaction (RT-PCR) approach was used to clone a cDNA encoding the Euglena gracilis homolog of yeast Cbf5p, a protein component of the box H/ACA class of snoRNPs that mediate pseudouridine formation in eukaryotic rRNA. Cbf5p is a putative pseudouridine synthase, and the Euglena homolog is the first full-length Cbf5p sequence to be reported for an early diverging unicellular eukaryote (protist). Phylogenetic analysis of putative pseudouridine synthase sequences confirms that archaebacterial and eukaryotic (including Euglena) Cbf5p proteins are specifically related and are distinct from the TruB/Pus4p clade that is responsible for formation of pseudouridine at position 55 in eubacterial (TruB) and eukaryotic (Pus4p) tRNAs. Using a bioinformatics approach, we also identified archaebacterial genes encoding candidate homologs of yeast Gar1p and Nop10p, two additional proteins known to be associated with eukaryotic box H/ACA snoRNPs. These observations raise the possibility that pseudouridine formation in archaebacterial rRNA may be dependent on analogs of the eukaryotic box H/ACA snoRNPs, whose evolutionary origin may therefore predate the split between Archaea (archaebacteria) and Eucarya (eukaryotes). Database searches further revealed, in archaebacterial and some eukaryotic genomes, two previously unrecognized groups of genes (here designated 'PsuX' and 'PsuY') distantly related to the Cbf5p/TruB gene family.

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0 (Archaeal Proteins)
0 (Fungal Proteins)
0 (Microtubule-Associated Proteins)
0 (NOP10 protein, S cerevisiae)
0 (Nuclear Proteins)
0 (Oligodeoxyribonucleotides)
0 (RNA, Small Nuclear)
0 (RNA-Binding Proteins)
0 (Ribonucleoproteins, Small Nuclear)
0 (Ribonucleoproteins, Small Nucleolar)
0 (Saccharomyces cerevisiae Proteins)
146888-26-8 (GAR1 protein, S cerevisiae)
EC 4.2.1.- (Hydro-Lyases)
EC 4.2.1.70 (CBF5 protein, S cerevisiae)

Date Created: 20000628 Date Completed: 20000727 Latest Revision: 20190501

20221213

PMC102724

10.1093/nar/28.12.2342

10871366