Identification of distinct maturation steps involved in human 40S ribosomal subunit biosynthesis.

ABSTRACT: Technical problems intrinsic to the purification of preribosome intermediates have limited our understanding of ribosome biosynthesis in humans. Addressing this issue is important given the implication of this biological process in human disease. Here we report a preribosome purification and tagging strategy that overcomes some of the existing technical difficulties. Using these tools, we find that the pre-40S precursors go through two distinct maturation phases inside the nucleolus and follow a regulatory step that precedes late maturation in the cytoplasm. This regulatory step entails the intertwined actions of both PARN (a metazoan-specific ribonuclease) and RRP12 (a phylogenetically conserved 40S biogenesis factor that has acquired additional functional features in higher eukaryotes).

SUBMITTER: Nieto B 

PROVIDER: S-EPMC6952385 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature