PuSH - Publication Server of Helmholtz Zentrum München: A prion-like domain is required for phase separation and chloroplast RNA processing during cold acclimation in Arabidopsis.

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Legen, J.* ; Lenzen, B.* ; Kachariya, N. ; Feltgen, S.* ; Gao, Y.* ; Mergenthal, S.* ; Weber, W.* ; Klotzsch, E.* ; Zoschke, R.* ; Sattler, M. ; Schmitz-Linneweber, C.*

A prion-like domain is required for phase separation and chloroplast RNA processing during cold acclimation in Arabidopsis.

Plant Cell:koae145 (2024)

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Arabidopsis (Arabidopsis thaliana) plants can produce photosynthetic tissue with active chloroplasts at temperatures as low as 4°C, and this process depends on the presence of the nuclear-encoded, chloroplast-localized RNA-binding protein CP29A. In this study, we demonstrate that CP29A undergoes phase separation in vitro and in vivo in a temperature-dependent manner, which is mediated by a prion-like domain (PLD) located between the two RNA recognition motif (RRM) domains of CP29A. The resulting droplets display liquid-like properties and are found near chloroplast nucleoids. The PLD is required to support chloroplast RNA splicing and translation in cold-treated tissue. Together, our findings suggest that plant chloroplast gene expression is compartmentalized by inducible condensation of CP29A at low temperatures, a mechanism that could play a crucial role in plant cold resistance.

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