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Nucleotide exchange factors Fes1 and HspBP1 mimic substrate to release misfolded proteins from Hsp70
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
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Number of Authors: 82018 (English)In: Nature Structural & Molecular Biology, ISSN 1545-9993, E-ISSN 1545-9985, Vol. 25, no 1, p. 83-+Article in journal (Refereed) Published
Abstract [en]

Protein quality control depends on the tight regulation of interactions between molecular chaperones and polypeptide substrates. Substrate release from the chaperone Hsp70 is triggered by nucleotide-exchange factors (NEFs) that control folding and degradation fates via poorly understood mechanisms. We found that the armadillo-type NEFs budding yeast Fes1 and its human homolog HspBP1 employ flexible N-terminal release domains (RDs) with substrate-mimicking properties to ensure the efficient release of persistent substrates from Hsp70. The RD contacts the substrate-binding domain of the chaperone, competes with peptide substrate for binding and is essential for proper function in yeast and mammalian cells. Thus, the armadillo domain engages Hsp70 to trigger nucleotide exchange, whereas the RD safeguards the release of substrates. Our findings provide fundamental mechanistic insight into the functional specialization of Hsp70 NEFs and have implications for the understanding of proteostasis-related disorders, including Marinesco-Sjögren syndrome.

Place, publisher, year, edition, pages
2018. Vol. 25, no 1, p. 83-+
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Biological Sciences
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URN: urn:nbn:se:su:diva-153895DOI: 10.1038/s41594-017-0008-2ISI: 000423547700012PubMedID: 29323280OAI: oai:DiVA.org:su-153895DiVA, id: diva2:1188321
Available from: 2018-03-07 Created: 2018-03-07 Last updated: 2018-03-07Bibliographically approved

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Gowda, Naveen K. C.Kaimal, Jayasankar M.Daniel, ChammiranLiebau, JobstÖhman, MarieMayer, Matthias P.Andréasson, Claes
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Department of Molecular Biosciences, The Wenner-Gren InstituteDepartment of Biochemistry and Biophysics
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