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Glucose stress causes mRNA retention in nuclear Nab2 condensates

Heinrich, Stephanie
Hondele, Maria
Marchand, Désirée
Derrer, Carina Patrizia
Zedan, Mostafa
Oswald, Alexandra
Malinovska, Liliana
Uliana, Federico
Khawaja, Sarah
Mancini, Roberta
... show 2 more
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Abstract

Nuclear mRNA export via nuclear pore complexes is an essential step in eukaryotic gene expression. Although factors involved in mRNA transport have been characterized, a comprehensive mechanistic understanding of this process and its regulation is lacking. Here, we use single-RNA imaging in yeast to show that cells use mRNA retention to control mRNA export during stress. We demonstrate that, upon glucose withdrawal, the essential RNA-binding factor Nab2 forms RNA-dependent condensate-like structures in the nucleus. This coincides with a reduced abundance of the DEAD-box ATPase Dbp5 at the nuclear pore. Depleting Dbp5, and consequently blocking mRNA export, is necessary and sufficient to trigger Nab2 condensation. The state of Nab2 condensation influences the extent of nuclear mRNA accumulation and can be recapitulated in vitro, where Nab2 forms RNA-dependent liquid droplets. We hypothesize that cells use condensation to regulate mRNA export and control gene expression during stress.

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Heinrich S, Hondele M, Marchand D, Derrer CP, Zedan M, Oswald A, Malinovska L, Uliana F, Khawaja S, Mancini R, Grunwald D, Weis K. Glucose stress causes mRNA retention in nuclear Nab2 condensates. Cell Rep. 2024 Jan 23;43(1):113593. doi: 10.1016/j.celrep.2023.113593. Epub 2023 Dec 18. PMID: 38113140.

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10.1016/j.celrep.2023.113593
PubMed ID
38113140
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Copyright 2023 The Authors. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Attribution 4.0 International