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Cellular Handling of Protein Aggregates by Disaggregation Machines

Mogk, A., Bukau, B. & Kampinga, H. H., 18-Jan-2018, In : Molecular Cell. 69, 2, p. 214-226 13 p.

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  • Cellular Handling of Protein Aggregates by Disaggregation Machines

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DOI

Both acute proteotoxic stresses that unfold proteins and expression of disease-causing mutant proteins that expose aggregation-prone regions can promote protein aggregation. Protein aggregates can interfere with cellular processes and deplete factors crucial for protein homeostasis. To cope with these challenges, cells are equipped with diverse folding and degradation activities to rescue or eliminate aggregated proteins. Here, we review the different chaperone disaggregation machines and their mechanisms of action. In all these machines, the coating of protein aggregates by Hsp70 chaperones represents the conserved, initializing step. In bacteria, fungi, and plants, Hsp70 recruits and activates Hsp100 disaggregases to extract aggregated proteins. In the cytosol of metazoa, Hsp70 is empowered by a specific cast of J-protein and Hsp110 co-chaperones allowing for standalone disaggregation activity. Both types of disaggregation machines are supported by small Hsps that sequester misfolded proteins.

Original languageEnglish
Pages (from-to)214-226
Number of pages13
JournalMolecular Cell
Volume69
Issue number2
Publication statusPublished - 18-Jan-2018

    Keywords

  • HEAT-SHOCK PROTEINS, MOLECULAR CHAPERONE SSE1, AAA PLUS DISAGGREGASE, MISFOLDED PROTEINS, HSP70 CHAPERONES, NEURODEGENERATIVE DISEASE, CAENORHABDITIS-ELEGANS, SUBSTRATE-BINDING, DAMAGED PROTEINS, DNAK CHAPERONE

ID: 63245208