Analysis of Sequence and Structural Features That Identify the B/C Motif of U3 Small Nucleolar RNA As the Recognition Site for the Snu13p-Rrp9p Protein Pair
Overview
Affiliations
The eukaryal Snu13p/15.5K protein binds K-turn motifs in U4 snRNA and snoRNAs. Two Snu13p/15.5K molecules bind the nucleolar U3 snoRNA required for the early steps of preribosomal processing. Binding of one molecule on the C'/D motif allows association of proteins Nop1p, Nop56p, and Nop58p, whereas binding of the second molecule on the B/C motif allows Rrp9p recruitment. To understand how the Snu13p-Rrp9p pair recognizes the B/C motif, we first improved the identification of RNA determinants required for Snu13p binding by experiments using the systematic evolution of ligands by exponential enrichment. This demonstrated the importance of a U.U pair stacked on the sheared pairs and revealed a direct link between Snu13p affinity and the stability of helices I and II. Sequence and structure requirements for efficient association of Rrp9p on the B/C motif were studied in yeast cells by expression of variant U3 snoRNAs and immunoselection assays. A G-C pair in stem II, a G residue at position 1 in the bulge, and a short stem I were found to be required. The data identify the in vivo function of most of the conserved residues of the U3 snoRNA B/C motif. They bring important information to understand how different K-turn motifs can recruit different sets of proteins after Snu13p association.
Small but Mighty-The Emerging Role of snoRNAs in Hematological Malignancies.
Calvo Sanchez J, Kohn M Noncoding RNA. 2021; 7(4).
PMID: 34842767 PMC: 8629011. DOI: 10.3390/ncrna7040068.
Emerging Data on the Diversity of Molecular Mechanisms Involving C/D snoRNAs.
Baldini L, Charpentier B, Labialle S Noncoding RNA. 2021; 7(2).
PMID: 34066559 PMC: 8162545. DOI: 10.3390/ncrna7020030.
Clerget G, Bourguignon-Igel V, Marmier-Gourrier N, Rolland N, Wacheul L, Manival X Nucleic Acids Res. 2020; 48(7):3848-3868.
PMID: 31996908 PMC: 7144924. DOI: 10.1093/nar/gkaa066.
Gene expression in life stages: Identifying a species-specific target for pest control applications.
Perkin L, Oppert B PeerJ. 2019; 7:e6946.
PMID: 31198628 PMC: 6535216. DOI: 10.7717/peerj.6946.
Mapping targets for small nucleolar RNAs in yeast.
Dudnakova T, Dunn-Davies H, Peters R, Tollervey D Wellcome Open Res. 2018; 3:120.
PMID: 30345388 PMC: 6171561. DOI: 10.12688/wellcomeopenres.14735.2.