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Dissecting Multi-protein Signaling Complexes by Bimolecular Complementation Affinity Purification BiCAP

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Published on: June 15, 2018

PEG3 Interacts with KAP1 through KRAB-A.

Hongzhi He¹, An Ye¹, Hana Kim¹

¹Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, United States of America.

|November 30, 2016

Summary

This summary is machine-generated.

Paternally Expressed Gene 3 (Peg3) is a KRAB-containing zinc finger protein. It physically interacts with KAP1, a co-repressor, suggesting a role in gene regulation.

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Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration

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Published on: May 19, 2016

Area of Science:

Genetics
Molecular Biology
Epigenetics

Background:

Paternally Expressed Gene 3 (Peg3) is an imprinted gene encoding a zinc finger DNA-binding protein.
Peg3 resides within a cluster of Kruppel-Associated Box (KRAB) zinc finger genes.
Exon 7 of Peg3 shares sequence similarity with KRAB-A domains.

Purpose of the Study:

To investigate the functional classification of Peg3 within the KRAB zinc finger gene family.
To determine if Peg3 interacts with known KRAB-associated co-repressors.
To elucidate the mechanism by which Peg3 regulates downstream genes.

Main Methods:

Co-immunoprecipitation assays to detect protein-protein interactions.
Analysis of Peg3 exon 7 for functional domains.
Chromatin immunoprecipitation (ChIP) assays.
Promoter activity assays.

Main Results:

The PEG3 protein was successfully co-immunoprecipitated with KAP1, a known KRAB-interacting co-repressor.
Experiments confirmed that Peg3 exon 7 is essential for its physical interaction with KAP1.
ChIP and promoter assays indicated that PEG3 mediates gene repression via KAP1.

Conclusions:

Peg3 is identified as a KRAB-containing zinc finger protein.
Peg3 physically interacts with the co-repressor KAP1.
Peg3 likely regulates downstream gene expression through KAP1-mediated repression.