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Related Concept Videos

In-vitro Mutagenesis01:16

In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.

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Isolating Interaction-Null&#47;Impaired Mutants Using the Yeast Two-Hybrid Assay
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Isolating Interaction-Null/Impaired Mutants Using the Yeast Two-Hybrid Assay

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A multiple ATG gene knockout strain for yeast two-hybrid analysis.

Yang Cao1, Usha Nair, Kyoko Yasumura-Yorimitsu

  • 1Life Sciences Institute, Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109-2216, USA.

Autophagy
|April 2, 2009
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Summary

Researchers developed a new yeast two-hybrid system using a multiple knockout strain to study autophagy-related (Atg) proteins. This system revealed a direct interaction between Atg29 and Atg31, independent of other proteins.

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Last Updated: Jun 24, 2026

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Published on: December 29, 2023

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Published on: January 26, 2017

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Published on: December 15, 2012

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Autophagy is a crucial cellular process implicated in various human diseases.
  • Understanding the molecular mechanisms of autophagy relies heavily on studying autophagy-related (Atg) proteins.
  • Determining direct protein-protein interactions among Atg proteins in vivo has been challenging due to indirect associations.

Purpose of the Study:

  • To develop a novel yeast two-hybrid (Y2H) host strain based on a multiple knockout (MKO) strain lacking 24 ATG genes.
  • To verify the utility of the new MKO Y2H strain by analyzing known Atg protein interactions.
  • To investigate a novel interaction between Atg proteins using the established MKO Y2H system.

Main Methods:

  • Creation of a multiple knockout (MKO) yeast strain lacking 24 autophagy-related (ATG) genes.
  • Conversion of the MKO strain into a yeast two-hybrid (Y2H) host strain by introducing three reporter genes.
  • Analysis of known Atg protein interactions and probing of a new interaction within the MKO Y2H background.

Main Results:

  • The MKO Y2H strain successfully verified known autophagy-related protein interactions.
  • A novel, direct interaction between Atg29 and Atg31 was identified.
  • This Atg29-Atg31 interaction appears independent of other known Atg proteins and may mediate the Atg17-Atg29 interaction.

Conclusions:

  • The developed MKO Y2H system is a valuable tool for dissecting direct protein-protein interactions in autophagy.
  • The direct interaction between Atg29 and Atg31 provides new insights into the autophagy machinery.
  • This finding suggests a potential regulatory role for the Atg29-Atg31 complex in mediating interactions within the autophagy pathway.