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Updated: Jan 20, 2026

Chemical Dimerization-Induced Protein Condensates on Telomeres

Chemical Dimerization-Induced Protein Condensates on Telomeres

Published on: April 12, 2021

KAP1 is an antiparallel dimer with a functional asymmetry.

Giulia Fonti^1,2, Maria J Marcaida^3,2, Louise C Bryan⁴

¹Institute of Bioengineering, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.

Life Science Alliance

|August 21, 2019

Summary

KRAB domain-associated protein 1 (KAP1) is an elongated, asymmetric dimer that regulates gene expression. Its unique structure impacts interactions with proteins like heterochromatin protein 1 (HP1), affecting chromatin organization.

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Last Updated: Jan 20, 2026

Chemical Dimerization-Induced Protein Condensates on Telomeres

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Published on: April 12, 2021

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography

Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography

Published on: September 14, 2014

Area of Science:

Molecular Biology
Epigenetics
Protein Structure and Function

Background:

KRAB domain-associated protein 1 (KAP1) is a crucial regulator of gene expression in mammalian cells.
KAP1 functions as a scaffold for transcription factors and possesses E3 ubiquitin ligase activity, influencing chromatin state.
Understanding KAP1's structural organization is key to elucidating its regulatory mechanisms.

Purpose of the Study:

To determine the overall structural organization of the full-length KAP1 protein.
To investigate the functional implications of KAP1's conformation on its interactions and role in gene regulation.

Main Methods:

Solution scattering data analysis.
Integrative modeling approaches.
Single-molecule experiments.

Main Results:

KAP1 forms an elongated, antiparallel dimer with asymmetry in its C-terminal domains.
The observed conformation supports the role of the Really Interesting New Gene (RING) domain in KAP1 auto-SUMOylation.
Heterochromatin protein 1 (HP1) binds to only one of the two potential sites on the KAP1 dimer, leading to an unusual stoichiometry.

Conclusions:

The intrinsic asymmetry of the KAP1 dimer is critical for its functional interactions.
This structural feature dictates the stoichiometry of KAP1-HP1 complexes, even on chromatin fibers.
The findings provide novel insights into the molecular mechanisms underlying KAP1-mediated gene regulation and chromatin organization.