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Related Experiment Video

Updated: Apr 16, 2026

Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry

Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry

Published on: May 17, 2016

A KAP1 phosphorylation switch controls MyoD function during skeletal muscle differentiation.

Kulwant Singh¹, Marco Cassano², Evarist Planet²

¹Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, Ontario K1H 8L6, Canada;

Genes & Development

|March 5, 2015

Summary

This summary is machine-generated.

KRAB-associated protein 1 (KAP1) acts as a scaffold, recruiting coactivators and corepressors to muscle genes. Upon differentiation, KAP1 phosphorylation releases corepressors, enabling MyoD to drive muscle development.

Keywords:

G9a KAP1 MSK1 phosphorylation MyoD epigenetics myogenesis

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Area of Science:

Molecular Biology
Cell Biology
Developmental Biology

Background:

MyoD is a master regulator of myogenesis, controlling muscle gene expression.
MyoD's activation is tightly regulated by differentiation cues and chromatin modifiers.
The precise mechanisms controlling MyoD's on/off switch remain incompletely understood.

Purpose of the Study:

To identify key regulators of MyoD function during myogenesis.
To elucidate the role of chromatin modifiers in controlling MyoD transcriptional activity.
To understand how cell signaling integrates with chromatin regulation to control muscle differentiation.

Main Methods:

Chromatin immunoprecipitation assays to identify protein binding at muscle gene promoters.
Biochemical assays to analyze protein interactions and complex formation.
Phosphorylation studies to investigate the regulation of KAP1 function.

Main Results:

KAP1/TRIM28 functions as a scaffold at muscle gene promoters in myoblasts, recruiting both coactivators and corepressors, leading to gene silencing.
MSK1-mediated phosphorylation of KAP1 during differentiation releases corepressors.
This release allows MyoD and Mef2 to activate muscle gene transcription.

Conclusions:

KAP1/TRIM28 is a critical regulator of MyoD function, acting as an interpreter of cell signaling.
KAP1 modulates the switch between MyoD-mediated gene repression and activation.
These findings reveal a novel mechanism controlling the initiation of myogenesis.