What is it about?
To ensure cellular function protein translation must be accurate. However, it seems that some errors are unpreventable or even desired to increase robustness against environmental stress. Plant cells are uniquely complex in that they coordinate protein translation in three organelles, the cytoplasm, the mitochondria, and the plastids. Our paper is the first study to quantify and manipulate protein mistranslation events in mitochondria and plastids. We find that both organelles, which in part rely on the same mechanisms, respond very differently and that plastids, which house photosynthesis, are exceptionally tolerant towards protein mistranslation.
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Why is it important?
In the last decade, several groups working on diverse model organisms across the tree of life have realized that some level of protein mistranslation might be a hardwired feature of cellular life to increase proteome plasticity. The latter seems useful to buffer environmental stress but also to purge deleterious mutations and mistranscription. With our study, we add plants as a convenient tool to study and test these novel and exciting hypotheses. Besides functional insights, applications that increase plant yield under adverse growth conditions may also benefit from this work.
Perspectives
Realizing this project was really exciting as we collaborated with so many great scientists. This allowed us to benefit from their expertise and to write a technically very sophisticated manuscript. More importantly, we learned so much during the process and developed many new bioinformatic and analytical skills, which we can now apply in further projects. Since translation errors are so common throughout the tree of life, we work towards a systemic understanding under which conditions these errors occur in nature and what impact this has on survival, adaptation, and evolution. I hope that other scientists are inspired by our study and join these efforts.
Hans-Henning Kunz
Ludwig-Maximilians-Universitat Munchen
Read the Original
This page is a summary of: Plants tolerate substantial rates of plastid mistranslation via regulated proteostasis, Proceedings of the National Academy of Sciences, May 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2537357123.
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