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The multistructural forms of box C/D ribonucleoprotein particles

Journal

RNA
Volume 24, Issue 12, Pages 1625-1633

Publisher

COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1261/rna.068312.118

Keywords

snoRNP structures; ribosome biogenesis; rRNA modification; fibrillarin; Nop56; Nop58; Nop5; kink-turn

Funding

  1. National Institutes of Health [R01 GM124622, R01 GM099604]

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Structural biology studies of archaeal and yeast box C/D ribonucleoprotein particles (RNPs) reveal a surprisingly wide range of forms. If form ever follows function, the different structures of box C/D small ribonucleoprotein particles (snoRNPs) may reflect their versatile functional roles beyond what has been recognized. A large majority of box C/D RNPs serve to site-specifically methylate the ribosomal RNA, typically as independent complexes. Select members of the box C/D snoRNPs also are essential components of the megadalton RNP enzyme, the small subunit processome that is responsible for processing ribosomal RNA. Other box C/D RNPs continue to be uncovered with either unexpected or unknown functions. We summarize currently known box C/D RNP structures in this review and identify the Nop56/58 and box C/D RNA subunits as the key elements underlying the observed structural diversity, and likely, the diverse functional roles of box C/D RNPs.

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