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2017 ; 6
(9
): 1342-1354
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Regulatory RNPs: a novel class of ribonucleoproteins that potentially contribute
to ribosome heterogeneity
#MMPMID28808137
Poole AR
; Vicino I
; Adachi H
; Yu YT
; Hebert MD
Biol Open
2017[Sep]; 6
(9
): 1342-1354
PMID28808137
show ga
Many ribonucleoproteins (RNPs), which are comprised of noncoding RNA and
associated proteins, are involved in essential cellular processes such as
translation and pre-mRNA splicing. One class of RNP is the small Cajal
body-specific RNP (scaRNP), which contributes to the biogenesis of small nuclear
RNPs (snRNPs) that are central components of the spliceosome. Three scaRNAs are
internally processed, generating stable nucleolus-enriched RNAs of unknown
function. Here, we provide data that show that these RNAs become part of RNPs we
term regulatory RNPs (regRNPs). Most modifications within rRNA (predominantly
pseudouridylation and ribose 2'-O-methylation) are conducted by small nucleolar
RNPs (snoRNPs), and we provide evidence that the activity of at least some of
these snoRNPs is under the control of regRNPs. Because modifications within rRNA
can vary in different physiological or pathological situations, rRNA
modifications are thought to be the major source of ribosome heterogeneity. Our
identification of regRNPs thus provides a potential mechanism for how ribosome
heterogeneity may be accomplished. This work also provides additional functional
connections between the Cajal body and the nucleolus.