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Mechanisms of CP190 Interaction with Architectural Proteins in Drosophila Melanogaster

Most of the known Drosophila architectural proteins interact with an important cofactor, CP190, that contains three domains (BTB, M, and D) that are involved in protein–protein interactions. The highly conserved N-terminal CP190 BTB domain forms a stable homodimer that interacts with unstructured re...

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Autores principales: Sabirov, Marat, Popovich, Anastasia, Boyko, Konstantin, Nikolaeva, Alena, Kyrchanova, Olga, Maksimenko, Oksana, Popov, Vladimir, Georgiev, Pavel, Bonchuk, Artem
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8618245/
https://www.ncbi.nlm.nih.gov/pubmed/34830280
http://dx.doi.org/10.3390/ijms222212400
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author Sabirov, Marat
Popovich, Anastasia
Boyko, Konstantin
Nikolaeva, Alena
Kyrchanova, Olga
Maksimenko, Oksana
Popov, Vladimir
Georgiev, Pavel
Bonchuk, Artem
author_facet Sabirov, Marat
Popovich, Anastasia
Boyko, Konstantin
Nikolaeva, Alena
Kyrchanova, Olga
Maksimenko, Oksana
Popov, Vladimir
Georgiev, Pavel
Bonchuk, Artem
author_sort Sabirov, Marat
collection PubMed
description Most of the known Drosophila architectural proteins interact with an important cofactor, CP190, that contains three domains (BTB, M, and D) that are involved in protein–protein interactions. The highly conserved N-terminal CP190 BTB domain forms a stable homodimer that interacts with unstructured regions in the three best-characterized architectural proteins: dCTCF, Su(Hw), and Pita. Here, we identified two new CP190 partners, CG4730 and CG31365, that interact with the BTB domain. The CP190 BTB resembles the previously characterized human BCL6 BTB domain, which uses its hydrophobic groove to specifically associate with unstructured regions of several transcriptional repressors. Using GST pull-down and yeast two-hybrid assays, we demonstrated that mutations in the hydrophobic groove strongly affect the affinity of CP190 BTB for the architectural proteins. In the yeast two-hybrid assay, we found that architectural proteins use various mechanisms to improve the efficiency of interaction with CP190. Pita and Su(Hw) have two unstructured regions that appear to simultaneously interact with hydrophobic grooves in the BTB dimer. In dCTCF and CG31365, two adjacent regions interact simultaneously with the hydrophobic groove of the BTB and the M domain of CP190. Finally, CG4730 interacts with the BTB, M, and D domains of CP190 simultaneously. These results suggest that architectural proteins use different mechanisms to increase the efficiency of interaction with CP190.
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spelling pubmed-86182452021-11-27 Mechanisms of CP190 Interaction with Architectural Proteins in Drosophila Melanogaster Sabirov, Marat Popovich, Anastasia Boyko, Konstantin Nikolaeva, Alena Kyrchanova, Olga Maksimenko, Oksana Popov, Vladimir Georgiev, Pavel Bonchuk, Artem Int J Mol Sci Article Most of the known Drosophila architectural proteins interact with an important cofactor, CP190, that contains three domains (BTB, M, and D) that are involved in protein–protein interactions. The highly conserved N-terminal CP190 BTB domain forms a stable homodimer that interacts with unstructured regions in the three best-characterized architectural proteins: dCTCF, Su(Hw), and Pita. Here, we identified two new CP190 partners, CG4730 and CG31365, that interact with the BTB domain. The CP190 BTB resembles the previously characterized human BCL6 BTB domain, which uses its hydrophobic groove to specifically associate with unstructured regions of several transcriptional repressors. Using GST pull-down and yeast two-hybrid assays, we demonstrated that mutations in the hydrophobic groove strongly affect the affinity of CP190 BTB for the architectural proteins. In the yeast two-hybrid assay, we found that architectural proteins use various mechanisms to improve the efficiency of interaction with CP190. Pita and Su(Hw) have two unstructured regions that appear to simultaneously interact with hydrophobic grooves in the BTB dimer. In dCTCF and CG31365, two adjacent regions interact simultaneously with the hydrophobic groove of the BTB and the M domain of CP190. Finally, CG4730 interacts with the BTB, M, and D domains of CP190 simultaneously. These results suggest that architectural proteins use different mechanisms to increase the efficiency of interaction with CP190. MDPI 2021-11-17 /pmc/articles/PMC8618245/ /pubmed/34830280 http://dx.doi.org/10.3390/ijms222212400 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sabirov, Marat
Popovich, Anastasia
Boyko, Konstantin
Nikolaeva, Alena
Kyrchanova, Olga
Maksimenko, Oksana
Popov, Vladimir
Georgiev, Pavel
Bonchuk, Artem
Mechanisms of CP190 Interaction with Architectural Proteins in Drosophila Melanogaster
title Mechanisms of CP190 Interaction with Architectural Proteins in Drosophila Melanogaster
title_full Mechanisms of CP190 Interaction with Architectural Proteins in Drosophila Melanogaster
title_fullStr Mechanisms of CP190 Interaction with Architectural Proteins in Drosophila Melanogaster
title_full_unstemmed Mechanisms of CP190 Interaction with Architectural Proteins in Drosophila Melanogaster
title_short Mechanisms of CP190 Interaction with Architectural Proteins in Drosophila Melanogaster
title_sort mechanisms of cp190 interaction with architectural proteins in drosophila melanogaster
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8618245/
https://www.ncbi.nlm.nih.gov/pubmed/34830280
http://dx.doi.org/10.3390/ijms222212400
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