Metabolomics

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Mitochondrial-Derived Compartments Facilitate Cellular Adaptation to Amino Acid Stress


ABSTRACT: Amino acids are essential building blocks of life. However, increasing evidence suggests that elevated amino acids cause cellular toxicity associated with numerous metabolic disorders. How cells cope with elevated amino acids remains poorly understood. Here, we show that a previously identified cellular structure, the mitochondrial-derived compartment (MDC), functions to protect cells from amino acid stress. In response to amino acid elevation, MDCs are generated from mitochondria, where they selectively sequester and deplete SLC25A nutrient carriers and their associated import receptor Tom70 from the organelle. Generation of MDCs promotes amino acid catabolism, and their formation occurs simultaneously with transporter removal at the plasma membrane via the multi-vesicular body (MVB) pathway. Combined loss of vacuolar amino acid storage, MVBs and MDCs renders cells sensitive to high amino acid stress. Thus, we propose that MDCs operate as part of a coordinated cell network that facilitates amino acid homoeostasis through post-translational nutrient transporter remodeling.

ORGANISM(S): Yeast Saccharomyces Cerevisiae

TISSUE(S): Yeast Cells

SUBMITTER: Adam Hughes  

PROVIDER: ST001901 | MetabolomicsWorkbench | Thu Jul 22 00:00:00 BST 2021

REPOSITORIES: MetabolomicsWorkbench

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