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GroEL Ring Separation and Exchange in the Chaperonin Reaction

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

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

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

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

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

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

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

Externe Ressourcen

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

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Zitation

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.


Zitierlink: https://hdl.handle.net/21.11116/0000-0000-B13A-7
Zusammenfassung
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.