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  GroEL Ring Separation and Exchange in the Chaperonin Reaction

Yan, X., Shi, Q., Bracher, A., Milicic, G., Singh, A. K., Hartl, F. U., et al. (2018). GroEL Ring Separation and Exchange in the Chaperonin Reaction. Cell, 172(3), 605-617.e11. doi:10.1016/j.cell.2017.12.010.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-B13A-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-B13B-6
Genre: Journal Article

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https://doi.org/10.1016/j.cell.2017.12.010 (Publisher version)
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 Creators:
Yan, Xiao1, Author              
Shi, Qiaoyun1, Author              
Bracher, Andreas1, Author              
Milicic, Goran1, Author              
Singh, Amit K.1, Author              
Hartl, F. Ulrich1, Author              
Hayer-Hartl, Manajit2, Author              
Affiliations:
1Hartl, Franz-Ulrich / Cellular Biochemistry, Max Planck Institute of Biochemistry, Max Planck Society, ou_1565152              
2Hayer-Hartl, Manajit / Chaperonin-assisted Protein Folding, Max Planck Institute of Biochemistry, Max Planck Society, ou_1565153              

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Free keywords: FOLDING FUNCTIONAL FORM; CRYSTAL-STRUCTURE; ATP HYDROLYSIS; REACTION CYCLE; IN-VIVO; POLYPEPTIDE BINDING; ESCHERICHIA-COLI; HEAT-SHOCK; NANO-CAGE; PROTEINBiochemistry & Molecular Biology; Cell Biology;
 Abstract: The bacterial chaperonin GroEL and its cofactor, GroES, form a nano-cage for a single molecule of substrate protein (SP) to fold in isolation. GroEL and GroES undergo an ATP-regulated interaction cycle to close and open the folding cage. GroEL consists of two heptameric rings stacked back to back. Here, we show that GroEL undergoes transient ring separation, resulting in ring exchange between complexes. Ring separation occurs upon ATP-binding to the trans ring of the asymmetric GroEL:7ADP:GroES complex in the presence or absence of SP and is a consequence of inter-ring negative allostery. We find that a GroEL mutant unable to perform ring separation is folding active but populates symmetric GroEL: GroES(2) complexes, where both GroEL rings function simultaneously rather than sequentially. As a consequence, SP binding and release from the folding chamber is inefficient, and E. coli growth is impaired. We suggest that transient ring separation is an integral part of the chaperonin mechanism.

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Language(s): eng - English
 Dates: 2018-01-112018
 Publication Status: Published in print
 Pages: 24
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Degree: -

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Title: Cell
Source Genre: Journal
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Publ. Info: Cambridge, Mass. : Cell Press
Pages: - Volume / Issue: 172 (3) Sequence Number: - Start / End Page: 605 - 617.e11 Identifier: ISSN: 0092-8674
CoNE: /journals/resource/954925463183