When mitochondria lose their fold: matrix proteostasis and stress signaling

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Abstract
A dedicated network of chaperones and proteases is present in the mitochondrial matrix that orchestrates import, folding, disaggregation and eventually degradation of proteins. When this network is overwhelmed, unfolded or misfolded proteins accumulate in different types of aggregates which may either support recovery of functional proteins, initiate spatial sequestration or drive toxic aggregation. Here, we discuss mitochondrial protein aggregation and how mitochondrial proteostasis stress is communicated to the rest of the cell.

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