The potential role of liquid-liquid phase separation in the cellular fate of the compartments for unconventional protein secretion.

Autor: Mendes LFS; Group of Biophysics and Structural Biology 'Sergio Mascarenhas'. São Carlos Institute of Physics, University of São Paulo, São Carlos, São Paulo, Brazil.; Department of Physics, Ribeirão Preto School of Philosophy, Science, and Literature, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.; Laboratory of Physical Chemistry, Swiss Federal Institute of Technology, ETH Hönggerberg, Zürich, Switzerland., Gimenes CO; Department of Physics, Ribeirão Preto School of Philosophy, Science, and Literature, University of São Paulo, Ribeirão Preto, São Paulo, Brazil., da Silva MDO; Group of Biophysics and Structural Biology 'Sergio Mascarenhas'. São Carlos Institute of Physics, University of São Paulo, São Carlos, São Paulo, Brazil., Rout SK; Laboratory of Physical Chemistry, Swiss Federal Institute of Technology, ETH Hönggerberg, Zürich, Switzerland., Riek R; Laboratory of Physical Chemistry, Swiss Federal Institute of Technology, ETH Hönggerberg, Zürich, Switzerland., Costa-Filho AJ; Department of Physics, Ribeirão Preto School of Philosophy, Science, and Literature, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
Jazyk: angličtina
Zdroj: Protein science : a publication of the Protein Society [Protein Sci] 2024 Jul; Vol. 33 (7), pp. e5085.
DOI: 10.1002/pro.5085
Abstrakt: Eukaryotic cells have developed intricate mechanisms for biomolecule transport, particularly in stressful conditions. This interdisciplinary study delves into unconventional protein secretion (UPS) pathways activated during starvation, facilitating the export of proteins bypassing most of the components of the classical secretory machinery. Specifically, we focus on the underexplored mechanisms of the GRASP's role in UPS, particularly in biogenesis and cargo recruitment for the vesicular-like compartment for UPS. Our results show that liquid-liquid phase separation (LLPS) plays a key role in the coacervation of Grh1, the GRASP yeast homologue, under starvation-like conditions. This association seems a precursor to the Compartment for Unconventional Protein Secretion (CUPS) biogenesis. Grh1's self-association is regulated by electrostatic, hydrophobic, and hydrogen-bonding interactions. Importantly, our study demonstrates that phase-separated states of Grh1 can recruit UPS cargo under starvation-like situations. Additionally, we explore how the coacervate liquid-to-solid transition could impact cells' ability to return to normal post-stress states. Our findings offer insights into intracellular protein dynamics and cell adaptive responses to stress.
(© 2024 The Protein Society.)
Databáze: MEDLINE
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