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Assembly of the Lipid Bilayer in the ER01:28

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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E2 Reaction: Kinetics and Mechanism02:45

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SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
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E1 Reaction: Kinetics and Mechanism02:46

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Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only...
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E2 Reaction: Stereochemistry and Regiochemistry02:43

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Elimination reactions of alkyl halides can yield one or more alkenes depending on the specific regiochemical and stereochemical considerations. While the regiochemistry of the reaction governs the location of the double bond in the product, the stereochemical requirements often influence the geometry.
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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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E1 Reaction: Stereochemistry and Regiochemistry02:43

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One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.
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Structural insights into E2-E3 interaction for LC3 lipidation.

Zoltan Metlagel1, Chinatsu Otomo1, Kazuto Ohashi1

  • 1Department of Integrative Structural and Computational Biology; The Scripps Research Institute; La Jolla, CA USA.

Autophagy
|January 14, 2014
PubMed
Summary

The ATG12-ATG5-ATG16L1 complex recruits ATG3, a key enzyme in autophagy, by binding to its flexible region. This interaction is essential for the LC3 lipidation cascade, a crucial step in autophagosome formation.

Keywords:
Atg8lipid conjugationprotein structureprotein–peptide interactionubiquitin-like protein

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The LC3/Atg8 protein family is essential for autophagy, covalently attaching to autophagosomal membranes.
  • LC3 lipidation, the final step in LC3 conjugation, involves transfer from ATG3 (E2 enzyme) to phosphatidylethanolamine (PE).
  • The ATG12-ATG5-ATG16L1 (E3) complex stimulates this transfer, but its mechanism remains unclear.

Purpose of the Study:

  • To elucidate the mechanism by which the ATG12-ATG5-ATG16L1 E3 complex stimulates LC3 transfer to PE.
  • To investigate the interaction between the E3 complex and the E2 enzyme ATG3.

Main Methods:

  • High-affinity binding assays to characterize the interaction between ATG12 and ATG3.
  • Structural analyses to determine the atomic details of the ATG12-ATG3 interaction.
  • Biochemical assays to assess the functional significance of this interaction in the LC3 lipidation cascade.

Main Results:

  • The ATG12 component of the E3 complex binds with high affinity to a specific sequence within the flexible region (FR) of ATG3.
  • This ATG12-ATG3 interaction is critical for the formation of the E2-E3 complex.
  • Structural data provides a detailed understanding of the binding interface and its implications for E3 complex function.

Conclusions:

  • The interaction between ATG12 and ATG3 is a key regulatory step in initiating LC3 transfer during autophagy.
  • ATG12 acts as a crucial recruitment module, bringing ATG3 into proximity with the autophagosomal membrane for efficient LC3 lipidation.
  • These findings offer new insights into the molecular mechanisms governing autophagosome biogenesis.