1
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Khan P, Singha P, Nag Chaudhuri R. RNA Polymerase II Dependent Crosstalk between H4K16 Deacetylation and H3K56 Acetylation Promotes Transcription of Constitutively Expressed Genes. Mol Cell Biol 2023; 43:596-610. [PMID: 37937370 PMCID: PMC10761024 DOI: 10.1080/10985549.2023.2270912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 10/05/2023] [Indexed: 11/09/2023] Open
Abstract
Nucleosome dynamics in the coding region of a transcriptionally active locus is critical for understanding how RNA polymerase II progresses through the gene body. Histone acetylation and deacetylation critically influence nucleosome accessibility during DNA metabolic processes like transcription. Effect of such histone modifications is context and residue dependent. Rather than effect of individual histone residues, the network of modifications of several histone residues in combination generates a chromatin landscape that is conducive for transcription. Here we show that in Saccharomyces cerevisiae, crosstalk between deacetylation of the H4 N-terminal tail residue H4K16 and acetylation of the H3 core domain residue H3K56, promotes RNA polymerase II progression through the gene body. Results indicate that deacetylation of H4K16 precedes and in turn induces H3K56 acetylation. Effectively, recruitment of Rtt109, the HAT responsible for H3K56 acetylation is essentially dependent on H4K16 deacetylation. In Hos2 deletion strains, where H4K16 deacetylation is abolished, both H3K56 acetylation and RNA polymerase II recruitment gets significantly impaired. Notably, H4K16 deacetylation and H3K56 acetylation are found to be essentially dependent on active transcription. In summary, H4K16 deacetylation promotes H3K56 acetylation and the two modifications together work towards successful functioning of RNA polymerase II during active transcription.
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Affiliation(s)
- Preeti Khan
- Department of Biotechnology, St Xavier’s College, Kolkata, India
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2
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McCauley MJ, Morse M, Becker N, Hu Q, Botuyan MV, Navarrete E, Huo R, Muthurajan UM, Rouzina I, Luger K, Mer G, Maher LJ, Williams MC. Human FACT subunits coordinate to catalyze both disassembly and reassembly of nucleosomes. Cell Rep 2022; 41:111858. [PMID: 36577379 PMCID: PMC9807050 DOI: 10.1016/j.celrep.2022.111858] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 10/06/2022] [Accepted: 11/30/2022] [Indexed: 12/28/2022] Open
Abstract
The histone chaperone FACT (facilitates chromatin transcription) enhances transcription in eukaryotic cells, targeting DNA-protein interactions. FACT, a heterodimer in humans, comprises SPT16 and SSRP1 subunits. We measure nucleosome stability and dynamics in the presence of FACT and critical component domains. Optical tweezers quantify FACT/subdomain binding to nucleosomes, displacing the outer wrap of DNA, disrupting direct DNA-histone (core site) interactions, altering the energy landscape of unwrapping, and increasing the kinetics of DNA-histone disruption. Atomic force microscopy reveals nucleosome remodeling, while single-molecule fluorescence quantifies kinetics of histone loss for disrupted nucleosomes, a process accelerated by FACT. Furthermore, two isolated domains exhibit contradictory functions; while the SSRP1 HMGB domain displaces DNA, SPT16 MD/CTD stabilizes DNA-H2A/H2B dimer interactions. However, only intact FACT tethers disrupted DNA to the histones and supports rapid nucleosome reformation over several cycles of force disruption/release. These results demonstrate that key FACT domains combine to catalyze both nucleosome disassembly and reassembly.
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Affiliation(s)
| | - Michael Morse
- Department of Physics, Northeastern University, Boston, MA, USA
| | - Nicole Becker
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Science, Rochester, MN, USA
| | - Qi Hu
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Science, Rochester, MN, USA
| | - Maria Victoria Botuyan
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Science, Rochester, MN, USA
| | - Emily Navarrete
- Department of Physics, Northeastern University, Boston, MA, USA
| | - Ran Huo
- Department of Physics, Northeastern University, Boston, MA, USA
| | - Uma M. Muthurajan
- Department of Biochemistry, University of Colorado, Boulder, CO, USA
| | - Ioulia Rouzina
- Department of Chemistry and Biochemistry, Ohio State University, Columbus, OH 43210, USA
| | - Karolin Luger
- Department of Biochemistry, University of Colorado, Boulder, CO, USA,Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA
| | - Georges Mer
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Science, Rochester, MN, USA
| | - L. James Maher
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Science, Rochester, MN, USA
| | - Mark C. Williams
- Department of Physics, Northeastern University, Boston, MA, USA,Lead contact,Correspondence:
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3
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López-Rivera F, Chuang J, Spatt D, Gopalakrishnan R, Winston F. Suppressor mutations that make the essential transcription factor Spn1/Iws1 dispensable in Saccharomyces cerevisiae. Genetics 2022; 222:iyac125. [PMID: 35977387 PMCID: PMC9526074 DOI: 10.1093/genetics/iyac125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 08/11/2022] [Indexed: 11/12/2022] Open
Abstract
Spn1/Iws1 is an essential eukaryotic transcription elongation factor that is conserved from yeast to humans as an integral member of the RNA polymerase II elongation complex. Several studies have shown that Spn1 functions as a histone chaperone to control transcription, RNA splicing, genome stability, and histone modifications. However, the precise role of Spn1 is not understood, and there is little understanding of why it is essential for viability. To address these issues, we have isolated 8 suppressor mutations that bypass the essential requirement for Spn1 in Saccharomyces cerevisiae. Unexpectedly, the suppressors identify several functionally distinct complexes and activities, including the histone chaperone FACT, the histone methyltransferase Set2, the Rpd3S histone deacetylase complex, the histone acetyltransferase Rtt109, the nucleosome remodeler Chd1, and a member of the SAGA coactivator complex, Sgf73. The identification of these distinct groups suggests that there are multiple ways in which Spn1 bypass can occur, including changes in histone acetylation and alterations in other histone chaperones. Thus, Spn1 may function to overcome repressive chromatin by multiple mechanisms during transcription. Our results suggest that bypassing a subset of these functions allows viability in the absence of Spn1.
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Affiliation(s)
| | - James Chuang
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Dan Spatt
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | | | - Fred Winston
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
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4
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Connell Z, Parnell TJ, McCullough LL, Hill CP, Formosa T. The interaction between the Spt6-tSH2 domain and Rpb1 affects multiple functions of RNA Polymerase II. Nucleic Acids Res 2021; 50:784-802. [PMID: 34967414 PMCID: PMC8789061 DOI: 10.1093/nar/gkab1262] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 11/29/2021] [Accepted: 12/09/2021] [Indexed: 11/21/2022] Open
Abstract
The conserved transcription elongation factor Spt6 makes several contacts with the RNA Polymerase II (RNAPII) complex, including a high-affinity interaction between the Spt6 tandem SH2 domain (Spt6-tSH2) and phosphorylated residues of the Rpb1 subunit in the linker between the catalytic core and the C-terminal domain (CTD) heptad repeats. This interaction contributes to generic localization of Spt6, but we show here that it also has gene-specific roles. Disrupting the interface affected transcription start site selection at a subset of genes whose expression is regulated by this choice, and this was accompanied by changes in a distinct pattern of Spt6 accumulation at these sites. Splicing efficiency was also diminished, as was apparent progression through introns that encode snoRNAs. Chromatin-mediated repression was impaired, and a distinct role in maintaining +1 nucleosomes was identified, especially at ribosomal protein genes. The Spt6-tSH2:Rpb1 interface therefore has both genome-wide functions and local roles at subsets of genes where dynamic decisions regarding initiation, transcript processing, or termination are made. We propose that the interaction modulates the availability or activity of the core elongation and histone chaperone functions of Spt6, contributing to coordination between RNAPII and its accessory factors as varying local conditions call for dynamic responses.
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Affiliation(s)
- Zaily Connell
- Dept of Biochemistry, University of Utah School of Medicine 15 N Medical Drive, Rm 4100, Salt Lake City, UT 84112, USA
| | - Timothy J Parnell
- Huntsman Cancer Institute, 2000 Circle of Hope, Salt Lake City, UT 84112, USA
| | - Laura L McCullough
- Dept of Biochemistry, University of Utah School of Medicine 15 N Medical Drive, Rm 4100, Salt Lake City, UT 84112, USA
| | - Christopher P Hill
- Dept of Biochemistry, University of Utah School of Medicine 15 N Medical Drive, Rm 4100, Salt Lake City, UT 84112, USA
| | - Tim Formosa
- Dept of Biochemistry, University of Utah School of Medicine 15 N Medical Drive, Rm 4100, Salt Lake City, UT 84112, USA
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5
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Viktorovskaya O, Chuang J, Jain D, Reim NI, López-Rivera F, Murawska M, Spatt D, Churchman LS, Park PJ, Winston F. Essential histone chaperones collaborate to regulate transcription and chromatin integrity. Genes Dev 2021; 35:698-712. [PMID: 33888559 PMCID: PMC8091981 DOI: 10.1101/gad.348431.121] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 03/30/2021] [Indexed: 12/15/2022]
Abstract
Histone chaperones are critical for controlling chromatin integrity during transcription, DNA replication, and DNA repair. Three conserved and essential chaperones, Spt6, Spn1/Iws1, and FACT, associate with elongating RNA polymerase II and interact with each other physically and/or functionally; however, there is little understanding of their individual functions or their relationships with each other. In this study, we selected for suppressors of a temperature-sensitive spt6 mutation that disrupts the Spt6-Spn1 physical interaction and that also causes both transcription and chromatin defects. This selection identified novel mutations in FACT. Surprisingly, suppression by FACT did not restore the Spt6-Spn1 interaction, based on coimmunoprecipitation, ChIP, and mass spectrometry experiments. Furthermore, suppression by FACT bypassed the complete loss of Spn1. Interestingly, the FACT suppressor mutations cluster along the FACT-nucleosome interface, suggesting that they alter FACT-nucleosome interactions. In agreement with this observation, we showed that the spt6 mutation that disrupts the Spt6-Spn1 interaction caused an elevated level of FACT association with chromatin, while the FACT suppressors reduced the level of FACT-chromatin association, thereby restoring a normal Spt6-FACT balance on chromatin. Taken together, these studies reveal previously unknown regulation between histone chaperones that is critical for their essential in vivo functions.
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Affiliation(s)
- Olga Viktorovskaya
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - James Chuang
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Dhawal Jain
- Department of Biomedical Informatics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Natalia I Reim
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Francheska López-Rivera
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Magdalena Murawska
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Dan Spatt
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - L Stirling Churchman
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Peter J Park
- Department of Biomedical Informatics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Fred Winston
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
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6
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Wang P, Yang W, Zhao S, Nashun B. Regulation of chromatin structure and function: insights into the histone chaperone FACT. Cell Cycle 2021; 20:465-479. [PMID: 33590780 DOI: 10.1080/15384101.2021.1881726] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
In eukaryotic cells, changes in chromatin accessibility are necessary for chromatin to maintain its highly dynamic nature at different times during the cell cycle. Histone chaperones interact with histones and regulate chromatin dynamics. Facilitates chromatin transcription (FACT) is an important histone chaperone that plays crucial roles during various cellular processes. Here, we analyze the structural characteristics of FACT, discuss how FACT regulates nucleosome/chromatin reorganization and summarize possible functions of FACT in transcription, replication, and DNA repair. The possible involvement of FACT in cell fate determination is also discussed.Abbreviations: FACT: facilitates chromatin transcription, Spt16: suppressor of Ty16, SSRP1: structure-specific recognition protein-1, NTD: N-terminal domain, DD: dimerization domain, MD: middle domain, CTD: C-terminus domain, IDD: internal intrinsically disordered domain, HMG: high mobility group, CID: C-terminal intrinsically disordered domain, Nhp6: non-histone chromosomal protein 6, RNAPII: RNA polymerase II, CK2: casein kinase 2, AID: acidic inner disorder, PIC: pre-initiation complex, IR: ionizing radiation, DDSB: DNA double-strand break, PARlation: poly ADP-ribosylation, BER: base-excision repair, UVSSA: UV-stimulated scaffold protein A, HR: homologous recombination, CAF-1: chromatin assembly factor 1, Asf1: anti-silencing factor 1, Rtt106: regulator of Ty1 transposition protein 106, H3K56ac: H3K56 acetylation, KD: knock down, SETD2: SET domain containing 2, H3K36me3: trimethylation of lysine36 in histone H3, H2Bub: H2B ubiquitination, iPSCs: induced pluripotent stem cells, ESC: embryonic stem cell, H3K4me3: trimethylation of lysine 4 on histone H3 protein subunit, CHD1: chromodomain protein.
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Affiliation(s)
- Peijun Wang
- State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, China
| | - Wanting Yang
- State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, China
| | - Shuxin Zhao
- State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, China
| | - Buhe Nashun
- State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, China
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7
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Ash1 and Tup1 dependent repression of the Saccharomyces cerevisiae HO promoter requires activator-dependent nucleosome eviction. PLoS Genet 2020; 16:e1009133. [PMID: 33382702 PMCID: PMC7806131 DOI: 10.1371/journal.pgen.1009133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 01/13/2021] [Accepted: 11/25/2020] [Indexed: 11/30/2022] Open
Abstract
Transcriptional regulation of the Saccharomyces cerevisiae HO gene is highly complex, requiring a balance of multiple activating and repressing factors to ensure that only a few transcripts are produced in mother cells within a narrow window of the cell cycle. Here, we show that the Ash1 repressor associates with two DNA sequences that are usually concealed within nucleosomes in the HO promoter and recruits the Tup1 corepressor and the Rpd3 histone deacetylase, both of which are required for full repression in daughters. Genome-wide ChIP identified greater than 200 additional sites of co-localization of these factors, primarily within large, intergenic regions from which they could regulate adjacent genes. Most Ash1 binding sites are in nucleosome depleted regions (NDRs), while a small number overlap nucleosomes, similar to HO. We demonstrate that Ash1 binding to the HO promoter does not occur in the absence of the Swi5 transcription factor, which recruits coactivators that evict nucleosomes, including the nucleosomes obscuring the Ash1 binding sites. In the absence of Swi5, artificial nucleosome depletion allowed Ash1 to bind, demonstrating that nucleosomes are inhibitory to Ash1 binding. The location of binding sites within nucleosomes may therefore be a mechanism for limiting repressive activity to periods of nucleosome eviction that are otherwise associated with activation of the promoter. Our results illustrate that activation and repression can be intricately connected, and events set in motion by an activator may also ensure the appropriate level of repression and reset the promoter for the next activation cycle. Nucleosomes inhibit both gene expression and DNA-binding by regulatory factors. Here we examine the role of nucleosomes in regulating the binding of repressive transcription factors to the complex promoter for the yeast HO gene. Ash1 is a sequence-specific DNA-binding protein, and we show that it recruits the Tup1 global repressive factor to the HO promoter. Using a method to determine where Ash1 and Tup1 are bound to DNA throughout the genome, we discovered that Tup1 is also present at most places where Ash1 binds. The majority of these sites are in “Nucleosome Depleted Regions,” or NDRs, where the absence of chromatin makes factor binding easier. We discovered that the HO promoter is an exception, in that the two places where Ash1 binds overlap nucleosomes. Activation of the HO promoter is a complex, multi-step process, and we demonstrated that chromatin factors transiently evict these nucleosomes from the HO promoter during the cell cycle, allowing Ash1 to bind and recruit Tup1. Thus, activators must evict nucleosomes from the promoter to allow the repressive machinery to bind.
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8
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Shukla A, Bhalla P, Potdar PK, Jampala P, Bhargava P. Transcription-dependent enrichment of the yeast FACT complex influences nucleosome dynamics on the RNA polymerase III-transcribed genes. RNA (NEW YORK, N.Y.) 2020; 27:rna.077974.120. [PMID: 33277439 PMCID: PMC7901838 DOI: 10.1261/rna.077974.120] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 11/30/2020] [Indexed: 05/04/2023]
Abstract
The FACT (FAcilitates Chromatin Transactions) complex influences transcription initiation and enables passage of RNA polymerase (pol) II through gene body nucleosomes during elongation. In the budding yeast, ~280 non-coding RNA genes highly transcribed in vivo by pol III are found in the nucleosome-free regions bordered by positioned nucleosomes. The downstream nucleosome dynamics was found to regulate transcription via controlling the gene terminator accessibility and hence, terminator-dependent pol III recycling. As opposed to the enrichment at the 5'-ends of pol II-transcribed genes, our genome-wide mapping found transcription-dependent enrichment of the FACT subunit Spt16 near the 3'-end of all pol III-transcribed genes. Spt16 physically associates with the pol III transcription complex and shows gene-specific occupancy levels on the individual genes. On the non-tRNA pol III-transcribed genes, Spt16 facilitates transcription by reducing the nucleosome occupany on the gene body. On the tRNA genes, it maintains the position of the nucleosome at the 3' gene-end and affects transcription in gene-specific manner. Under nutritional stress, Spt16 enrichment is abolished in the gene downstream region of all pol III-transcribed genes and reciprocally changed on the induced or repressed pol II-transcribed ESR genes. Under the heat and replicative stress, its occupancy on the pol III-transcribed genes increases significantly. Our results show that Spt16 elicits a differential, gene-specific and stress-responsive dynamics, which provides a novel stress-sensor mechanism of regulating transcription against external stress. By primarily influencing the nucleosomal organization, FACT links the downstream nucleosome dynamics to transcription and environmental stress on the pol III-transcribed genes.
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9
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Formosa T, Winston F. The role of FACT in managing chromatin: disruption, assembly, or repair? Nucleic Acids Res 2020; 48:11929-11941. [PMID: 33104782 PMCID: PMC7708052 DOI: 10.1093/nar/gkaa912] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 10/01/2020] [Accepted: 10/05/2020] [Indexed: 12/20/2022] Open
Abstract
FACT (FAcilitates Chromatin Transcription) has long been considered to be a transcription elongation factor whose ability to destabilize nucleosomes promotes RNAPII progression on chromatin templates. However, this is just one function of this histone chaperone, as FACT also functions in DNA replication. While broadly conserved among eukaryotes and essential for viability in many organisms, dependence on FACT varies widely, with some differentiated cells proliferating normally in its absence. It is therefore unclear what the core functions of FACT are, whether they differ in different circumstances, and what makes FACT essential in some situations but not others. Here, we review recent advances and propose a unifying model for FACT activity. By analogy to DNA repair, we propose that the ability of FACT to both destabilize and assemble nucleosomes allows it to monitor and restore nucleosome integrity as part of a system of chromatin repair, in which disruptions in the packaging of DNA are sensed and returned to their normal state. The requirement for FACT then depends on the level of chromatin disruption occurring in the cell, and the cell's ability to tolerate packaging defects. The role of FACT in transcription would then be just one facet of a broader system for maintaining chromatin integrity.
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Affiliation(s)
- Tim Formosa
- Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
| | - Fred Winston
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
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10
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Yu Y, Yarrington RM, Stillman DJ. FACT and Ash1 promote long-range and bidirectional nucleosome eviction at the HO promoter. Nucleic Acids Res 2020; 48:10877-10889. [PMID: 33010153 PMCID: PMC7641740 DOI: 10.1093/nar/gkaa819] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/07/2020] [Accepted: 09/25/2020] [Indexed: 11/14/2022] Open
Abstract
The Saccharomyces cerevisiae HO gene is a model regulatory system with complex transcriptional regulation. Budding yeast divide asymmetrically and HO is expressed only in mother cells where a nucleosome eviction cascade along the promoter during the cell cycle enables activation. HO expression in daughter cells is inhibited by high concentration of Ash1 in daughters. To understand how Ash1 represses transcription, we used a myo4 mutation which boosts Ash1 accumulation in both mothers and daughters and show that Ash1 inhibits promoter recruitment of SWI/SNF and Gcn5. We show Ash1 is also required for the efficient nucleosome repopulation that occurs after eviction, and the strongest effects of Ash1 are seen when Ash1 has been degraded and at promoter locations distant from where Ash1 bound. Additionally, we defined a specific nucleosome/nucleosome-depleted region structure that restricts HO activation to one of two paralogous DNA-binding factors. We also show that nucleosome eviction occurs bidirectionally over a large distance. Significantly, eviction of the more distant nucleosomes is dependent upon the FACT histone chaperone, and FACT is recruited to these regions when eviction is beginning. These last observations, along with ChIP experiments involving the SBF factor, suggest a long-distance loop transiently forms at the HO promoter.
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Affiliation(s)
- Yaxin Yu
- Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, UT 84112, USA
| | - Robert M Yarrington
- Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, UT 84112, USA
| | - David J Stillman
- Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, UT 84112, USA
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11
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Murawska M, Schauer T, Matsuda A, Wilson MD, Pysik T, Wojcik F, Muir TW, Hiraoka Y, Straub T, Ladurner AG. The Chaperone FACT and Histone H2B Ubiquitination Maintain S. pombe Genome Architecture through Genic and Subtelomeric Functions. Mol Cell 2020; 77:501-513.e7. [PMID: 31837996 PMCID: PMC7007867 DOI: 10.1016/j.molcel.2019.11.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 10/01/2019] [Accepted: 11/15/2019] [Indexed: 12/31/2022]
Abstract
The histone chaperone FACT and histone H2B ubiquitination (H2Bub) facilitate RNA polymerase II (Pol II) passage through chromatin, yet it is not clear how they cooperate mechanistically. We used genomics, genetic, biochemical, and microscopic approaches to dissect their interplay in Schizosaccharomyces pombe. We show that FACT and H2Bub globally repress antisense transcripts near the 5' end of genes and inside gene bodies, respectively. The accumulation of these transcripts is accompanied by changes at genic nucleosomes and Pol II redistribution. H2Bub is required for FACT activity in genic regions. In the H2Bub mutant, FACT binding to chromatin is altered and its association with histones is stabilized, which leads to the reduction of genic nucleosomes. Interestingly, FACT depletion globally restores nucleosomes in the H2Bub mutant. Moreover, in the absence of Pob3, the FACT Spt16 subunit controls the 3' end of genes. Furthermore, FACT maintains nucleosomes in subtelomeric regions, which is crucial for their compaction.
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Affiliation(s)
- Magdalena Murawska
- Biomedical Center, Physiological Chemistry, Ludwig-Maximilians-University of Munich, 82152 Planegg-Martinsried, Germany
| | - Tamas Schauer
- Biomedical Center, Bioinformatics Unit, Ludwig-Maximilians-University of Munich, 82152 Planegg-Martinsried, Germany
| | - Atsushi Matsuda
- Advanced ICT Research Institute Kobe, National Institute of Information and Communications Technology, 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe 651-2492, Japan; Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita 565-0871, Japan
| | - Marcus D Wilson
- Wellcome Centre for Cell Biology, University of Edinburgh, Michael Swann Building, Kings Buildings, Mayfield Road, Edinburgh EH9 3JR, UK
| | - Thomas Pysik
- Biomedical Center, Physiological Chemistry, Ludwig-Maximilians-University of Munich, 82152 Planegg-Martinsried, Germany
| | - Felix Wojcik
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
| | - Tom W Muir
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
| | - Yasushi Hiraoka
- Advanced ICT Research Institute Kobe, National Institute of Information and Communications Technology, 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe 651-2492, Japan; Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita 565-0871, Japan
| | - Tobias Straub
- Biomedical Center, Bioinformatics Unit, Ludwig-Maximilians-University of Munich, 82152 Planegg-Martinsried, Germany
| | - Andreas G Ladurner
- Biomedical Center, Physiological Chemistry, Ludwig-Maximilians-University of Munich, 82152 Planegg-Martinsried, Germany.
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12
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Garcia-Luis J, Lazar-Stefanita L, Gutierrez-Escribano P, Thierry A, Cournac A, García A, González S, Sánchez M, Jarmuz A, Montoya A, Dore M, Kramer H, Karimi MM, Antequera F, Koszul R, Aragon L. FACT mediates cohesin function on chromatin. Nat Struct Mol Biol 2019; 26:970-979. [PMID: 31582854 PMCID: PMC6779571 DOI: 10.1038/s41594-019-0307-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 08/21/2019] [Indexed: 11/09/2022]
Abstract
Cohesin is a regulator of genome architecture with roles in sister chromatid cohesion and chromosome compaction. The recruitment and mobility of cohesin complexes on DNA is restricted by nucleosomes. Here, we show that the role of cohesin in chromosome organization requires the histone chaperone FACT ('facilitates chromatin transcription') in Saccharomyces cerevisiae. We find that FACT interacts directly with cohesin, and is dynamically required for its localization on chromatin. Depletion of FACT in metaphase cells prevents cohesin accumulation at pericentric regions and causes reduced binding on chromosome arms. Using the Hi-C technique, we show that cohesin-dependent TAD (topological associated domain)-like structures in G1 and metaphase chromosomes are reduced in the absence of FACT. Sister chromatid cohesion is intact in FACT-depleted cells, although chromosome segregation failure is observed. Our data show that FACT contributes to the formation of cohesin-dependent TADs, thus uncovering a new role for this complex in nuclear organization during interphase and mitotic chromosome folding.
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Affiliation(s)
- Jonay Garcia-Luis
- Cell Cycle Group, MRC London Institute of Medical Sciences (LMS), London, UK
| | - Luciana Lazar-Stefanita
- Institut Pasteur, Department of Genomes and Genetics, Unité Régulation Spatiale des Génomes, Paris, France
| | | | - Agnes Thierry
- Institut Pasteur, Department of Genomes and Genetics, Unité Régulation Spatiale des Génomes, Paris, France
| | - Axel Cournac
- Institut Pasteur, Department of Genomes and Genetics, Unité Régulation Spatiale des Génomes, Paris, France
| | - Alicia García
- Instituto de Biología Funcional y Genómica (IBFG), CSIC/Universidad de Salamanca, Salamanca, Spain
| | - Sara González
- Instituto de Biología Funcional y Genómica (IBFG), CSIC/Universidad de Salamanca, Salamanca, Spain
| | - Mar Sánchez
- Instituto de Biología Funcional y Genómica (IBFG), CSIC/Universidad de Salamanca, Salamanca, Spain
| | - Adam Jarmuz
- Cell Cycle Group, MRC London Institute of Medical Sciences (LMS), London, UK
| | - Alex Montoya
- Biological Mass Spectrometry and Proteomics Facility, MRC London Institute of Medical Sciences (LMS), London, UK
| | - Marian Dore
- Bioinformatics Facility, MRC London Institute of Medical Sciences (LMS), London, UK
| | - Holger Kramer
- Biological Mass Spectrometry and Proteomics Facility, MRC London Institute of Medical Sciences (LMS), London, UK
| | - Mohammad M Karimi
- Bioinformatics Facility, MRC London Institute of Medical Sciences (LMS), London, UK
| | - Francisco Antequera
- Instituto de Biología Funcional y Genómica (IBFG), CSIC/Universidad de Salamanca, Salamanca, Spain
| | - Romain Koszul
- Institut Pasteur, Department of Genomes and Genetics, Unité Régulation Spatiale des Génomes, Paris, France.
| | - Luis Aragon
- Cell Cycle Group, MRC London Institute of Medical Sciences (LMS), London, UK.
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