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Extracellular chaperone networks and the export of J-domain proteins

An extracellular network of molecular chaperones protects a diverse array of proteins that reside in or pass through extracellular spaces. Proteins in the extracellular milieu face numerous challenges that can lead to protein misfolding and aggregation. As a checkpoint for proteins that move between...

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Autor principal: Braun, Janice E.A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Society for Biochemistry and Molecular Biology 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9867986/
https://www.ncbi.nlm.nih.gov/pubmed/36581212
http://dx.doi.org/10.1016/j.jbc.2022.102840
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author Braun, Janice E.A.
author_facet Braun, Janice E.A.
author_sort Braun, Janice E.A.
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description An extracellular network of molecular chaperones protects a diverse array of proteins that reside in or pass through extracellular spaces. Proteins in the extracellular milieu face numerous challenges that can lead to protein misfolding and aggregation. As a checkpoint for proteins that move between cells, extracellular chaperone networks are of growing clinical relevance. J-domain proteins (JDPs) are ubiquitous molecular chaperones that are known for their essential roles in a wide array of fundamental cellular processes through their regulation of heat shock protein 70s. As the largest molecular chaperone family, JDPs have long been recognized for their diverse functions within cells. Some JDPs are elegantly selective for their “client proteins,” some do not discriminate among substrates and others act cooperatively on the same target. The realization that JDPs are exported through both classical and unconventional secretory pathways has fueled investigation into the roles that JDPs play in protein quality control and intercellular communication. The proposed functions of exported JDPs are diverse. Studies suggest that export of DnaJB11 enhances extracellular proteostasis, that intercellular movement of DnaJB1 or DnaJB6 enhances the proteostasis capacity in recipient cells, whereas the import of DnaJB8 increases resistance to chemotherapy in recipient cancer cells. In addition, the export of DnaJC5 and concurrent DnaJC5-dependent ejection of dysfunctional and aggregation-prone proteins are implicated in the prevention of neurodegeneration. This review provides a brief overview of the current understanding of the extracellular chaperone networks and outlines the first wave of studies describing the cellular export of JDPs.
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spelling pubmed-98679862023-01-27 Extracellular chaperone networks and the export of J-domain proteins Braun, Janice E.A. J Biol Chem JBC Reviews An extracellular network of molecular chaperones protects a diverse array of proteins that reside in or pass through extracellular spaces. Proteins in the extracellular milieu face numerous challenges that can lead to protein misfolding and aggregation. As a checkpoint for proteins that move between cells, extracellular chaperone networks are of growing clinical relevance. J-domain proteins (JDPs) are ubiquitous molecular chaperones that are known for their essential roles in a wide array of fundamental cellular processes through their regulation of heat shock protein 70s. As the largest molecular chaperone family, JDPs have long been recognized for their diverse functions within cells. Some JDPs are elegantly selective for their “client proteins,” some do not discriminate among substrates and others act cooperatively on the same target. The realization that JDPs are exported through both classical and unconventional secretory pathways has fueled investigation into the roles that JDPs play in protein quality control and intercellular communication. The proposed functions of exported JDPs are diverse. Studies suggest that export of DnaJB11 enhances extracellular proteostasis, that intercellular movement of DnaJB1 or DnaJB6 enhances the proteostasis capacity in recipient cells, whereas the import of DnaJB8 increases resistance to chemotherapy in recipient cancer cells. In addition, the export of DnaJC5 and concurrent DnaJC5-dependent ejection of dysfunctional and aggregation-prone proteins are implicated in the prevention of neurodegeneration. This review provides a brief overview of the current understanding of the extracellular chaperone networks and outlines the first wave of studies describing the cellular export of JDPs. American Society for Biochemistry and Molecular Biology 2022-12-26 /pmc/articles/PMC9867986/ /pubmed/36581212 http://dx.doi.org/10.1016/j.jbc.2022.102840 Text en © 2022 The Author https://creativecommons.org/licenses/by/4.0/This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle JBC Reviews
Braun, Janice E.A.
Extracellular chaperone networks and the export of J-domain proteins
title Extracellular chaperone networks and the export of J-domain proteins
title_full Extracellular chaperone networks and the export of J-domain proteins
title_fullStr Extracellular chaperone networks and the export of J-domain proteins
title_full_unstemmed Extracellular chaperone networks and the export of J-domain proteins
title_short Extracellular chaperone networks and the export of J-domain proteins
title_sort extracellular chaperone networks and the export of j-domain proteins
topic JBC Reviews
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9867986/
https://www.ncbi.nlm.nih.gov/pubmed/36581212
http://dx.doi.org/10.1016/j.jbc.2022.102840
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