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Related Experiment Videos

Review: allostery in chaperonins.

A Horovitz1, Y Fridmann, G Kafri

  • 1Department of Structural Biology, Weizmann Institute of Science, Rehovot, 76100, Israel. Amnon.Horovitz@weizmann.ac.il

Journal of Structural Biology
|October 3, 2001
PubMed
Summary

Chaperonins, crucial for protein folding, exhibit complex allosteric regulation of ATP binding. This study reviews these mechanisms and presents new findings on the allosteric effects of ADP.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Protein Folding

Background:

  • Chaperonins are essential molecular machines that facilitate protein folding.
  • Their function is ATP-dependent and involves intricate allosteric regulation.
  • Key chaperonins like GroEL and CCT display nested cooperativity in ATP binding.

Purpose of the Study:

  • To review the allosteric properties of chaperonins.
  • To present novel findings on the allosteric effects of ADP on chaperonins.
  • To discuss the role of allostery in the chaperonin reaction cycle and protein folding.

Main Methods:

  • Literature review of chaperonin allosteric regulation.
  • Experimental investigation of ADP's allosteric effects (details not specified in abstract).
  • Analysis of ATP binding cooperativity (homotropic and heterotropic).

Main Results:

  • Chaperonins exhibit both homotropic and heterotropic allosteric regulation.
  • Nested cooperativity (intra-ring positive, inter-ring negative) characterizes ATP binding in GroEL and CCT.
  • Various effectors, including nonfolded proteins, ADP, Mg2+, K+, and cochaperonins, modulate this cooperativity.

Conclusions:

  • Allosteric regulation is central to chaperonin function and reaction cycles.
  • ADP exerts significant allosteric effects, influencing chaperonin-mediated protein folding.
  • Understanding these allosteric mechanisms is key to deciphering protein homeostasis.

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