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Histone Chaperone Nrp1 Mutation Affects the Acetylation of H3K56 in Tetrahymena thermophila. Cells 2022; 11:cells11030408. [PMID: 35159218 PMCID: PMC8833950 DOI: 10.3390/cells11030408] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 01/12/2022] [Accepted: 01/20/2022] [Indexed: 02/04/2023] Open
Abstract
Histone modification and nucleosome assembly are mainly regulated by various histone-modifying enzymes and chaperones. The roles of histone-modification enzymes have been well analyzed, but the molecular mechanism of histone chaperones in histone modification and nucleosome assembly is incompletely understood. We previously found that the histone chaperone Nrp1 is localized in the micronucleus (MIC) and the macronucleus (MAC) and involved in the chromatin stability and nuclear division of Tetrahymena thermophila. In the present work, we found that truncated C-terminal mutant HA-Nrp1TrC abnormally localizes in the cytoplasm. The truncated-signal-peptide mutants HA-Nrp1TrNLS1 and HA-Nrp1TrNLS2 are localized in the MIC and MAC. Overexpression of Nrp1TrNLS1 inhibited cellular proliferation and disrupted micronuclear mitosis during the vegetative growth stage. During sexual development, Nrp1TrNLS1 overexpression led to abnormal bouquet structures and meiosis arrest. Furthermore, Histone H3 was not transported into the nucleus; instead, it formed an abnormal speckled cytoplastic distribution in the Nrp1TrNLS1 mutants. The acetylation level of H3K56 in the mutants also decreased, leading to significant changes in the transcription of the genome of the Nrp1TrNLS1 mutants. The histone chaperone Nrp1 regulates the H3 nuclear import and acetylation modification of H3K56 and affects chromatin stability and genome transcription in Tetrahymena.
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Ding T, Wen H, Wei H, Wu H, Zhao J, Chen F, Zhao J. Increased Expression of TBP/TFIID after spinal cord injury in adult rats. Cell Mol Neurobiol 2014; 34:669-77. [PMID: 24710803 DOI: 10.1007/s10571-014-0048-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 03/11/2014] [Indexed: 12/17/2022]
Abstract
Transcription factor IID (TFIID), as a general transcription factor, plays a pivotal role in the preinitiation complex (PIC) assembly and transcription initiation by recruiting RNA polymerase II to the promoter. The TFIID complex contains the TATA-box binding protein (TBP) and a group of conserved TAF proteins. However, its distribution and function in the central nervous system (CNS) are more diverse than previously understood. Here, we mainly investigated the spatiotemporal expression and cellular localization of TBP/TFIID during spinal cord injury (SCI) in adult rats. Western blot analysis revealed that TBP/TFIID was present in normal rat's spinal cord. It gradually increased, reached a peak at the third day after SCI, and then decreased. We observed that TBP/TFIID was widely distributed in spinal cord, mainly in neurons and glial cells. In addition, Western blot detection also showed that the third day post-injury was the proliferation peak indicated by the elevated expression of proliferating cell nuclear antigen (PCNA), a marker of proliferating cells. Importantly, injury-induced expression of TBP/TFIID was colabelled by PCNA showed the increase of TBP/TFIID expression in proliferating astrocytes and microglia. Collectively, we hypothesize that TBP/TFIID may be implicated in the proliferation of astrocytes and microglia and the recovery of neurological outcomes.
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Affiliation(s)
- Tao Ding
- Department of Orthopaedics, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, People's Republic of China
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Gelev V, Zabolotny JM, Lange M, Hiromura M, Yoo SW, Orlando JS, Kushnir A, Horikoshi N, Paquet E, Bachvarov D, Schaffer PA, Usheva A. A new paradigm for transcription factor TFIIB functionality. Sci Rep 2014; 4:3664. [PMID: 24441171 PMCID: PMC3895905 DOI: 10.1038/srep03664] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 11/12/2013] [Indexed: 12/23/2022] Open
Abstract
Experimental and bioinformatic studies of transcription initiation by RNA polymerase II (RNAP2) have revealed a mechanism of RNAP2 transcription initiation less uniform across gene promoters than initially thought. However, the general transcription factor TFIIB is presumed to be universally required for RNAP2 transcription initiation. Based on bioinformatic analysis of data and effects of TFIIB knockdown in primary and transformed cell lines on cellular functionality and global gene expression, we report that TFIIB is dispensable for transcription of many human promoters, but is essential for herpes simplex virus-1 (HSV-1) gene transcription and replication. We report a novel cell cycle TFIIB regulation and localization of the acetylated TFIIB variant on the transcriptionally silent mitotic chromatids. Taken together, these results establish a new paradigm for TFIIB functionality in human gene expression, which when downregulated has potent anti-viral effects.
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Affiliation(s)
- Vladimir Gelev
- 1] Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA [2]
| | - Janice M Zabolotny
- 1] Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA [2]
| | - Martin Lange
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Makoto Hiromura
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Sang Wook Yoo
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Joseph S Orlando
- Department of Microbiology and Molecular Genetics, Program in Virology, Harvard Medical School at Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
| | - Anna Kushnir
- Department of Microbiology and Molecular Genetics, Program in Virology, Harvard Medical School at Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
| | - Nobuo Horikoshi
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Eric Paquet
- Centre Hospitalier Universitaire de Québec (CHUQ)-Centre de Recherche, Hopital L'Hôtel-Dieu de Québec et Université Laval, Québec G1R 2J6, Canada
| | - Dimcho Bachvarov
- Centre Hospitalier Universitaire de Québec (CHUQ)-Centre de Recherche, Hopital L'Hôtel-Dieu de Québec et Université Laval, Québec G1R 2J6, Canada
| | - Priscilla A Schaffer
- Department of Microbiology and Molecular Genetics, Program in Virology, Harvard Medical School at Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
| | - Anny Usheva
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
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Müller Glia Cells Activation in Rat Retina After Optic Nerve Injury: Spatiotemporal Correlation with Transcription Initiation Factor IIB. J Mol Neurosci 2013; 51:37-46. [DOI: 10.1007/s12031-012-9941-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Accepted: 11/21/2012] [Indexed: 10/27/2022]
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Wu H, Liu Y, Zhou Y, Long L, Cheng X, Ji L, Weng H, Ding T, Yang J, Wei H, Li M, Huan W, Deng X, Wang Y. Changes in the BAG1 expression of Schwann cells after sciatic nerve crush. J Mol Neurosci 2012; 49:512-22. [PMID: 23108487 DOI: 10.1007/s12031-012-9910-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Accepted: 10/18/2012] [Indexed: 12/14/2022]
Abstract
Bcl-2-associated athanogene-1 (BAG1), a co-chaperone for Hsp70/Hsc70, is a multifunctional protein, which has been shown to suppress apoptosis and enhance neuronal differentiation. However, the expression and roles of BAG1 in peripheral system lesions and repair are still unknown. In this study, we investigated the dynamic changes in BAG1 expression in an acute sciatic nerve crush model in adult rats. Western blot analysis revealed that BAG1 was expressed in normal sciatic nerves. BAG1 expression increased progressively after sciatic nerve crush, reached a peak 2 weeks post-injury, and then returned to the normal level 4 weeks post-injury. Spatially, we observed that BAG1 was mainly expressed in Schwann cells and that BAG1 expression increased in Schwann cells after injury. In vitro, we found that BAG1 expression increased during the cyclic adenosine monophosphate (cAMP)-induced Schwann cell differentiation process. BAG1-specific siRNA inhibited cAMP-induced Schwann cell differentiation. In conclusion, we speculated that BAG1 was upregulated in the sciatic nerve after crush, which was associated with Schwann cell differentiation.
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Affiliation(s)
- Hao Wu
- Department of Orthopaedics, Affiliated Hospital of Nantong University, Nantong University, Nantong, 226001, Jiangsu, People's Republic of China
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