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Proteomic Analysis of Histones H2A/H2B and Variant Hv1 in Tetrahymena thermophila Reveals an Ancient Network of Chaperones
Epigenetic information, which can be passed on independently of the DNA sequence, is stored in part in the form of histone posttranslational modifications and specific histone variants. Although complexes necessary for deposition have been identified for canonical and variant histones, information r...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6502085/ https://www.ncbi.nlm.nih.gov/pubmed/30796450 http://dx.doi.org/10.1093/molbev/msz039 |
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author | Ashraf, Kanwal Nabeel-Shah, Syed Garg, Jyoti Saettone, Alejandro Derynck, Joanna Gingras, Anne-Claude Lambert, Jean-Philippe Pearlman, Ronald E Fillingham, Jeffrey |
author_facet | Ashraf, Kanwal Nabeel-Shah, Syed Garg, Jyoti Saettone, Alejandro Derynck, Joanna Gingras, Anne-Claude Lambert, Jean-Philippe Pearlman, Ronald E Fillingham, Jeffrey |
author_sort | Ashraf, Kanwal |
collection | PubMed |
description | Epigenetic information, which can be passed on independently of the DNA sequence, is stored in part in the form of histone posttranslational modifications and specific histone variants. Although complexes necessary for deposition have been identified for canonical and variant histones, information regarding the chromatin assembly pathways outside of the Opisthokonts remains limited. Tetrahymena thermophila, a ciliated protozoan, is particularly suitable to study and unravel the chromatin regulatory layers due to its unique physical separation of chromatin states in the form of two distinct nuclei present within the same cell. Using a functional proteomics pipeline, we carried out affinity purification followed by mass spectrometry of endogenously tagged T. thermophila histones H2A, H2B and variant Hv1.We identified a set of interacting proteins shared among the three analyzed histones that includes the FACT-complex, as well as H2A- or Hv1-specific chaperones. We find that putative subunits of T. thermophila versions of SWR- and INO80-complexes, as well as transcription-related histone chaperone Spt6(Tt) specifically copurify with Hv1. We also identified importin β6 and the T. thermophila ortholog of nucleoplasmin 1 (cNpl1(Tt)) as H2A–H2B interacting partners. Our results further implicate Poly [ADP-ribose] polymerases in histone metabolism. Molecular evolutionary analysis, reciprocal affinity purification coupled to mass spectrometry experiments, and indirect immunofluorescence studies using endogenously tagged Spt16(Tt) (FACT-complex subunit), cNpl1(Tt), and PARP6(Tt) underscore the validity of our approach and offer mechanistic insights. Our results reveal a highly conserved regulatory network for H2A (Hv1)–H2B concerning their nuclear import and assembly into chromatin. |
format | Online Article Text |
id | pubmed-6502085 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-65020852019-05-08 Proteomic Analysis of Histones H2A/H2B and Variant Hv1 in Tetrahymena thermophila Reveals an Ancient Network of Chaperones Ashraf, Kanwal Nabeel-Shah, Syed Garg, Jyoti Saettone, Alejandro Derynck, Joanna Gingras, Anne-Claude Lambert, Jean-Philippe Pearlman, Ronald E Fillingham, Jeffrey Mol Biol Evol Discoveries Epigenetic information, which can be passed on independently of the DNA sequence, is stored in part in the form of histone posttranslational modifications and specific histone variants. Although complexes necessary for deposition have been identified for canonical and variant histones, information regarding the chromatin assembly pathways outside of the Opisthokonts remains limited. Tetrahymena thermophila, a ciliated protozoan, is particularly suitable to study and unravel the chromatin regulatory layers due to its unique physical separation of chromatin states in the form of two distinct nuclei present within the same cell. Using a functional proteomics pipeline, we carried out affinity purification followed by mass spectrometry of endogenously tagged T. thermophila histones H2A, H2B and variant Hv1.We identified a set of interacting proteins shared among the three analyzed histones that includes the FACT-complex, as well as H2A- or Hv1-specific chaperones. We find that putative subunits of T. thermophila versions of SWR- and INO80-complexes, as well as transcription-related histone chaperone Spt6(Tt) specifically copurify with Hv1. We also identified importin β6 and the T. thermophila ortholog of nucleoplasmin 1 (cNpl1(Tt)) as H2A–H2B interacting partners. Our results further implicate Poly [ADP-ribose] polymerases in histone metabolism. Molecular evolutionary analysis, reciprocal affinity purification coupled to mass spectrometry experiments, and indirect immunofluorescence studies using endogenously tagged Spt16(Tt) (FACT-complex subunit), cNpl1(Tt), and PARP6(Tt) underscore the validity of our approach and offer mechanistic insights. Our results reveal a highly conserved regulatory network for H2A (Hv1)–H2B concerning their nuclear import and assembly into chromatin. Oxford University Press 2019-05 2019-02-22 /pmc/articles/PMC6502085/ /pubmed/30796450 http://dx.doi.org/10.1093/molbev/msz039 Text en © The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com |
spellingShingle | Discoveries Ashraf, Kanwal Nabeel-Shah, Syed Garg, Jyoti Saettone, Alejandro Derynck, Joanna Gingras, Anne-Claude Lambert, Jean-Philippe Pearlman, Ronald E Fillingham, Jeffrey Proteomic Analysis of Histones H2A/H2B and Variant Hv1 in Tetrahymena thermophila Reveals an Ancient Network of Chaperones |
title | Proteomic Analysis of Histones H2A/H2B and Variant Hv1 in Tetrahymena thermophila Reveals an Ancient Network of Chaperones |
title_full | Proteomic Analysis of Histones H2A/H2B and Variant Hv1 in Tetrahymena thermophila Reveals an Ancient Network of Chaperones |
title_fullStr | Proteomic Analysis of Histones H2A/H2B and Variant Hv1 in Tetrahymena thermophila Reveals an Ancient Network of Chaperones |
title_full_unstemmed | Proteomic Analysis of Histones H2A/H2B and Variant Hv1 in Tetrahymena thermophila Reveals an Ancient Network of Chaperones |
title_short | Proteomic Analysis of Histones H2A/H2B and Variant Hv1 in Tetrahymena thermophila Reveals an Ancient Network of Chaperones |
title_sort | proteomic analysis of histones h2a/h2b and variant hv1 in tetrahymena thermophila reveals an ancient network of chaperones |
topic | Discoveries |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6502085/ https://www.ncbi.nlm.nih.gov/pubmed/30796450 http://dx.doi.org/10.1093/molbev/msz039 |
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