Biomolecular condensates in fungi are tuned to function at specific temperatures.

Autor:	Stormo BM; Duke University, Department of Cell Biology, Durham, NC., McLaughlin GA; Duke University, Department of Cell Biology, Durham, NC.; University of North Carolina, Chapel Hill, Department of Biology., Frederick LK; University of North Carolina, Chapel Hill, Department of Biology., Jalihal AP; Duke University, Department of Cell Biology, Durham, NC., Cole SJ; Duke University, Department of Cell Biology, Durham, NC.; University of North Carolina, Chapel Hill, Department of Biochemistry and Biophysics., Seim I; Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany., Dietrich FS; Duke University, Department of Molecular Genetics and Microbiology, Durham, NC., Gladfelter AS; Duke University, Department of Cell Biology, Durham, NC.
Jazyk:	angličtina
Zdroj:	BioRxiv : the preprint server for biology [bioRxiv] 2023 Nov 27. Date of Electronic Publication: 2023 Nov 27.
DOI:	10.1101/2023.11.27.568884
Abstrakt:	Temperature can impact every reaction and molecular interaction essential to a cell. For organisms that cannot regulate their own temperature, a major challenge is how to adapt to temperatures that fluctuate unpredictability and on variable timescales. Biomolecular condensation offers a possible mechanism for encoding temperature-responsiveness and robustness into cell biochemistry and organization. To explore this idea, we examined temperature adaptation in a filamentous-growing fungus called Ashbya gossypii that engages biomolecular condensates containing the RNA-binding protein Whi3 to regulate mitosis and morphogenesis. We collected wild isolates of Ashbya that originate in different climates and found that mitotic asynchrony and polarized growth, which are known to be controlled by the condensation of Whi3, are temperature sensitive. Sequence analysis in the wild strains revealed changes to specific domains within Whi3 known to be important in condensate formation. Using an in vitro condensate reconstitution assay we found that temperature impacts the relative abundance of protein to RNA within condensates and that this directly impacts the material properties of the droplets. Finally, we found that exchanging Whi3 genes between warm and cold isolates was sufficient to rescue some, but not all, condensate-related phenotypes. Together these data demonstrate that material properties of Whi3 condensates are temperature sensitive, that these properties are important for function, and that sequence optimizes properties for a given climate. Competing Interests: Declaration of interests: Authors declare no competing interests.
Databáze:	MEDLINE
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