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Journal Article

GroEL Ring Separation and Exchange in the Chaperonin Reaction

MPS-Authors
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Yan,  Xiao
Hartl, Franz-Ulrich / Cellular Biochemistry, Max Planck Institute of Biochemistry, Max Planck Society;

/persons/resource/persons78701

Shi,  Qiaoyun
Hartl, Franz-Ulrich / Cellular Biochemistry, Max Planck Institute of Biochemistry, Max Planck Society;

/persons/resource/persons77798

Bracher,  Andreas
Hartl, Franz-Ulrich / Cellular Biochemistry, Max Planck Institute of Biochemistry, Max Planck Society;

/persons/resource/persons134752

Milicic,  Goran
Hartl, Franz-Ulrich / Cellular Biochemistry, Max Planck Institute of Biochemistry, Max Planck Society;

/persons/resource/persons198775

Singh,  Amit K.
Hartl, Franz-Ulrich / Cellular Biochemistry, Max Planck Institute of Biochemistry, Max Planck Society;

/persons/resource/persons78072

Hartl,  F. Ulrich
Hartl, Franz-Ulrich / Cellular Biochemistry, Max Planck Institute of Biochemistry, Max Planck Society;

/persons/resource/persons78078

Hayer-Hartl,  Manajit
Hayer-Hartl, Manajit / Chaperonin-assisted Protein Folding, Max Planck Institute of Biochemistry, Max Planck Society;

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https://doi.org/10.1016/j.cell.2017.12.010
(Publisher version)

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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0000-B13A-7
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.