Download MendeleyEukaryotic Box C/D methylation machinery has two non-symmetric protein assembly sites.
Hofler, S., Lukat, P., Blankenfeldt, W., Carlomagno, T.(2021) Sci Rep 11: 17561-17561
- PubMed: 34475498
- DOI: https://doi.org/10.1038/s41598-021-97030-y
- Primary Citation of Related Structures:
7OZQ - PubMed Abstract:
Box C/D ribonucleoprotein complexes are RNA-guided methyltransferases that methylate the ribose 2'-OH of RNA. The central 'guide RNA' has box C and D motifs at its ends, which are crucial for activity. Archaeal guide RNAs have a second box C'/D' motif pair that is also essential for function. This second motif is poorly conserved in eukaryotes and its function is uncertain. Conflicting literature data report that eukaryotic box C'/D' motifs do or do not bind proteins specialized to recognize box C/D-motifs and are or are not important for function. Despite this uncertainty, the architecture of eukaryotic 2'-O-methylation enzymes is thought to be similar to that of their archaeal counterpart. Here, we use biochemistry, X-ray crystallography and mutant analysis to demonstrate the absence of functional box C'/D' motifs in more than 80% of yeast guide RNAs. We conclude that eukaryotic Box C/D RNPs have two non-symmetric protein assembly sites and that their three-dimensional architecture differs from that of archaeal 2'-O-methylation enzymes.
Organizational Affiliation:
Institute for Organic Chemistry and Centre of Biomolecular Drug Research (BMWZ), Leibniz University Hannover, 30167, Hannover, Lower Saxony, Germany.
