Tor1 and CK2 kinases control a switch between alternative ribosome biogenesis pathways in a growth-dependent manner.

Abstract:

:Ribosome biogenesis is a major energy-consuming process in the cell that has to be rapidly down-regulated in response to stress or nutrient depletion. The target of rapamycin 1 (Tor1) pathway regulates synthesis of ribosomal RNA (rRNA) at the level of transcription initiation. It remains unclear whether ribosome biogenesis is also controlled directly at the posttranscriptional level. We show that Tor1 and casein kinase 2 (CK2) kinases regulate a rapid switch between a productive and a non-productive pre-rRNA processing pathways in yeast. Under stress, the pre-rRNA continues to be synthesized; however, it is processed differently, and no new ribosomes are produced. Strikingly, the control of the switch does not require the Sch9 kinase, indicating that an unrecognized Tor Complex 1 (TORC1) signaling branch involving CK2 kinase directly regulates ribosome biogenesis at the posttranscriptional level.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Kos-Braun IC,Jung I,Koš M

doi

10.1371/journal.pbio.2000245

subject

Has Abstract

pub_date

2017-03-10 00:00:00

pages

e2000245

issue

3

eissn

1544-9173

issn

1545-7885

pii

pbio.2000245

journal_volume

15

pub_type

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