ジャーナル: Mol Cell / 年: 2025 タイトル: Stm1 regulates Ifh1 activity revealing crosstalk between ribosome biogenesis and ribosome dormancy. 著者: Eliana Bianco / Martina Bonassera / Federico Uliana / Janny Tilma / Martin Winkler / Sevil Zencir / Alvar Gossert / Michaela Oborská-Oplová / Reinhard Dechant / Jannik Hugener / Vikram ...著者: Eliana Bianco / Martina Bonassera / Federico Uliana / Janny Tilma / Martin Winkler / Sevil Zencir / Alvar Gossert / Michaela Oborská-Oplová / Reinhard Dechant / Jannik Hugener / Vikram Govind Panse / Martin Pilhofer / Benjamin Albert / Philipp Kimmig / Matthias Peter / 要旨: Nutrient abundance boosts ribosome biogenesis, whereas ribosome dormancy factors limit ribosome degradation upon starvation. The equilibrium between the two pathways governs cell growth. In this ...Nutrient abundance boosts ribosome biogenesis, whereas ribosome dormancy factors limit ribosome degradation upon starvation. The equilibrium between the two pathways governs cell growth. In this study, we identified suppressor of Tom1 (Stm1) as a molecular link between ribosome protection and biogenesis in Saccharomyces cerevisiae. While Stm1 was previously described as a dormancy factor, we show that it activates Ifh1, a transcriptional activator of ribosomal protein genes. Stm1 transiently localizes to the nucleolus, where it interacts with pre-ribosomes and directly binds RNA and Ifh1 through its C-terminal intrinsically disordered region (IDR). Although the IDR is dispensable for ribosome protection, its loss compromises cell growth. The IDR is phosphorylated upon nutrient starvation, which disrupts its interaction with Ifh1. Our findings reveal a molecular pathway sensing and adjusting ribosome abundance in response to nutrient availability, reinforcing the relevance of regulated ribosome homeostasis in physiology and disease.
集束イオンビーム - 装置: OTHER / 集束イオンビーム - イオン: OTHER / 集束イオンビーム - 電圧: 30 / 集束イオンビーム - 電流: 0.05 / 集束イオンビーム - 時間: 1500 / 集束イオンビーム - 温度: 123 K / 集束イオンビーム - Initial thickness: 1000 / 集束イオンビーム - 最終 厚さ: 200 集束イオンビーム - 詳細: The value given for _em_focused_ion_beam.instrument is Zeiss Crossbeam 550. This is not in a list of allowed values {'OTHER', 'DB235'} so OTHER is written into the XML file.
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フィルム・検出器のモデル: GATAN K3 BIOCONTINUUM (6k x 4k) 平均電子線量: 145.0 e/Å2