U14 base-pairs with 18S rRNA: a novel snoRNA interaction required for rRNA processing.
نویسندگان
چکیده
منابع مشابه
18S rRNA processing requires base pairings of snR30 H/ACA snoRNA to eukaryote-specific 18S sequences
The H/ACA RNAs represent an abundant, evolutionarily conserved and functionally diverse class of non-coding RNAs. Many H/ACA RNAs direct pseudouridylation of rRNAs and snRNAs, while members of the rapidly growing group of 'orphan' H/ACA RNAs participate in pre-rRNA processing, telomere synthesis and probably, in other nuclear processes. The yeast snR30 'orphan' H/ACA snoRNA has long been known ...
متن کاملBase pairing between U3 small nucleolar RNA and the 5' end of 18S rRNA is required for pre-rRNA processing.
The loop of a stem structure close to the 5' end of the 18S rRNA is complementary to the box A region of the U3 small nucleolar RNA (snoRNA). Substitution of the 18S loop nucleotides inhibited pre-rRNA cleavage at site A(1), the 5' end of the 18S rRNA, and at site A(2), located 1.9 kb away in internal transcribed spacer 1. This inhibition was largely suppressed by a compensatory mutation in U3,...
متن کاملThe initial U3 snoRNA:pre-rRNA base pairing interaction required for pre-18S rRNA folding revealed by in vivo chemical probing
The synthesis of ribosomal subunits in the nucleolus is a conserved, essential process that results in cytoplasmic ribosomes with precisely processed and folded rRNAs assembled with ribosomal proteins. It has been proposed, but never directly demonstrated, that the U3 small nucleolar RNA (snoRNA), a nucleolar component required for ribosome biogenesis, is a chaperone for pre-18S rRNA folding. T...
متن کاملU17/snR30 is a ubiquitous snoRNA with two conserved sequence motifs essential for 18S rRNA production.
Saccharomyces cerevisiae snR30 is an essential box H/ACA small nucleolar RNA (snoRNA) required for the processing of 18S rRNA. Here, we show that the previously characterized human, reptilian, amphibian, and fish U17 snoRNAs represent the vertebrate homologues of yeast snR30. We also demonstrate that U17/snR30 is present in the fission yeast Schizosaccharomyces pombe and the unicellular ciliate...
متن کاملThe human 18S rRNA base methyltransferases DIMT1L and WBSCR22-TRMT112 but not rRNA modification are required for ribosome biogenesis
At the heart of the ribosome lie rRNAs, whose catalytic function in translation is subtly modulated by posttranscriptional modifications. In the small ribosomal subunit of budding yeast, on the 18S rRNA, two adjacent adenosines (A1781/A1782) are N(6)-dimethylated by Dim1 near the decoding site, and one guanosine (G1575) is N(7)-methylated by Bud23-Trm112 at a ridge between the P- and E-site tRN...
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ژورنال
عنوان ژورنال: Genes & Development
سال: 1995
ISSN: 0890-9369
DOI: 10.1101/gad.9.19.2433