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Allosteric regulation through a switch element in the autophagy E2, Atg3.

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The E1, E2, and E3-interacting region (E123IR) in Atg3 acts as an allosteric switch, regulating Atg8 lipidation during autophagy. Binding of E1 or E3 enzymes to E123IR conformationally activates Atg3 for efficient lipid conjugation.

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Lipidation of Atg8-family proteins is crucial for macroautophagy/autophagy.
  • This process involves a trienzyme cascade including E1 (Atg7), E2 (Atg3), and E3 (Atg12-Atg5-Atg16) enzymes.
  • The precise mechanism of Atg3's coordination between E1 and E3 enzymes remained unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism of Atg3 in orchestrating Atg8 lipidation.
  • To identify and characterize a novel regulatory element within Atg3.

Main Methods:

  • Biochemical assays to study enzyme interactions.
  • In vitro and in vivo experiments to assess Atg8 lipidation.
  • Structural and functional analysis of Atg3.

Main Results:

  • Identified an 'E1, E2, and E3-interacting region' (E123IR) in Atg3.
  • Demonstrated that E123IR acts as an allosteric switch, restraining Atg3's catalytic loop.
  • Showed that binding of E1 or E3 enzymes to E123IR relieves this restraint, conformationally activating Atg3.

Conclusions:

  • The E123IR is a key regulatory element controlling Atg3 activity in the Atg8 lipidation pathway.
  • This allosteric mechanism explains how Atg3 coordinates with upstream and downstream enzymes.
  • Understanding this regulation provides insights into the broader process of autophagy.