Liquid droplet formation and cytoplasm to vacuole targeting of aminopeptidase I are temperature sensitive in Saccharomyces cerevisiae.

Kuninori Suzuki, Eri Hirata

FEBS letters 2023 Mar

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Aminopeptidase I (Ape1) is one of the major cargoes of the cytoplasm-to-vacuole targeting (Cvt) pathway, which is a kind of selective autophagy, in Saccharomyces cerevisiae. After synthesis, the Ape1 precursor (prApe1) undergoes phase separation to form liquid droplets, termed Ape1 droplets, in the cytoplasm. In this study, we found that cells expressing prApe1-GFP exhibited temperature-sensitive formation of Ape1 droplets, which affected its transport. Moreover, we showed that endogenous Ape1 transport was defective at high temperatures in various laboratory strains due to the defect in the formation of Ape1 droplets at these temperatures. Finally, we found that gene disruptants showing heat-tolerant growth suppressed the temperature sensitivity of the Ape1 transport. The formation of Ape1 droplets might be an indicator of cytoplasmic integrity at high temperature. © 2022 The Authors. FEBS Letters published by John Wiley & Sons Ltd on behalf of Federation of European Biochemical Societies.

Citation

Kuninori Suzuki, Eri Hirata. Liquid droplet formation and cytoplasm to vacuole targeting of aminopeptidase I are temperature sensitive in Saccharomyces cerevisiae. FEBS letters. 2023 Mar;597(5):631-642