1
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Asuelime-Smith MBT, Ma DZ. Investigating Liquid-Liquid Phase Separation in Virus-Generated Inclusion Bodies Using Fluorescence Recovery After Photobleaching of Fluorescently Labeled Host Proteins. Methods Mol Biol 2024; 2808:129-140. [PMID: 38743367 DOI: 10.1007/978-1-0716-3870-5_10] [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] [Indexed: 05/16/2024]
Abstract
Many negative-sense single-stranded RNA viruses within the order Mononegavirales harm humans. A common feature shared among cells infected by these viruses is the formation of subcellular membraneless structures called biomolecular condensates, also known as inclusion bodies (IBs), that form through a process called liquid-liquid phase separation (LLPS). Like many other membraneless organelles, viral IBs enrich a specific subset of viral and host proteins involved in the formation of viral particles. Elucidation of the properties and regulation of these IBs as they mature throughout the viral replication process are important for our understanding of viral replication, which may also lead to the development of alternative antiviral treatments. The protocol outlined in this chapter aims to characterize the intrinsic properties of LLPS within the measles virus (MeV, a member of Mononegavirales) IBs by using an imaging approach that fluorescently tags an IB-associated host protein. This method uses common laboratory techniques and is generalizable to any host factors as well as other viral systems.
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Affiliation(s)
- Matthew B T Asuelime-Smith
- The Department of Molecular, Cell, and Developmental Biology, University of California Santa Barbara, Santa Barbara, CA, USA
| | - Dzwokai Z Ma
- Molecular, Cellular, and Developmental Biology, University of California Santa Barbara, Santa Barbara, CA, USA.
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2
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Qiu C, Xia F, Zhang J, Shi Q, Meng Y, Wang C, Pang H, Gu L, Xu C, Guo Q, Wang J. Advanced Strategies for Overcoming Endosomal/Lysosomal Barrier in Nanodrug Delivery. RESEARCH (WASHINGTON, D.C.) 2023; 6:0148. [PMID: 37250954 PMCID: PMC10208951 DOI: 10.34133/research.0148] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 04/27/2023] [Indexed: 05/31/2023]
Abstract
Nanocarriers have therapeutic potential to facilitate drug delivery, including biological agents, small-molecule drugs, and nucleic acids. However, their efficiency is limited by several factors; among which, endosomal/lysosomal degradation after endocytosis is the most important. This review summarizes advanced strategies for overcoming endosomal/lysosomal barriers to efficient nanodrug delivery based on the perspective of cellular uptake and intracellular transport mechanisms. These strategies include promoting endosomal/lysosomal escape, using non-endocytic methods of delivery to directly cross the cell membrane to evade endosomes/lysosomes and making a detour pathway to evade endosomes/lysosomes. On the basis of the findings of this review, we proposed several promising strategies for overcoming endosomal/lysosomal barriers through the smarter and more efficient design of nanodrug delivery systems for future clinical applications.
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Affiliation(s)
- Chong Qiu
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Fei Xia
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Junzhe Zhang
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Qiaoli Shi
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Yuqing Meng
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Chen Wang
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Huanhuan Pang
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Liwei Gu
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Chengchao Xu
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Qiuyan Guo
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Jigang Wang
- Artemisinin Research Center, and Institute of Chinese Materia Medica,
China Academy of Chinese Medical Sciences, Beijing 100700, China
- Department of Nephrology, and Shenzhen Clinical Research Centre for Geriatrics, Shenzhen People's Hospital, The First Affiliated Hospital,
Southern University of Science and Technology, Shenzhen, Guangdong 518020, China
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3
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Gu Y, Chen Y, Wei L, Wu S, Shen K, Liu C, Dong Y, Zhao Y, Zhang Y, Zhang C, Zheng W, He J, Wang Y, Li Y, Zhao X, Wang H, Tan J, Wang L, Zhou Q, Xie G, Liang H, Ou J. ABHD5 inhibits YAP-induced c-Met overexpression and colon cancer cell stemness via suppressing YAP methylation. Nat Commun 2021; 12:6711. [PMID: 34795238 PMCID: PMC8602706 DOI: 10.1038/s41467-021-26967-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 10/26/2021] [Indexed: 01/05/2023] Open
Abstract
Cancer stemness represents a major source of development and progression of colorectal cancer (CRC). c-Met critically contributes to CRC stemness, but how c-Met is activated in CRC remains elusive. We previously identified the lipolytic factor ABHD5 as an important tumour suppressor gene in CRC. Here, we show that loss of ABHD5 promotes c-Met activation to sustain CRC stemness in a non-canonical manner. Mechanistically, we demonstrate that ABHD5 interacts in the cytoplasm with the core subunit of the SET1A methyltransferase complex, DPY30, thereby inhibiting the nuclear translocation of DPY30 and activity of SET1A. In the absence of ABHD5, DPY30 translocates to the nucleus and supports SET1A-mediated methylation of YAP and histone H3, which sequesters YAP in the nucleus and increases chromatin accessibility to synergistically promote YAP-induced transcription of c-Met, thus promoting the stemness of CRC cells. This study reveals a novel role of ABHD5 in regulating histone/non-histone methylation and CRC stemness.
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Affiliation(s)
- Yan Gu
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Yanrong Chen
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Lai Wei
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Shuang Wu
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Kaicheng Shen
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Chengxiang Liu
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Yan Dong
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Yang Zhao
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Yue Zhang
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Chi Zhang
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Wenling Zheng
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Jiangyi He
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Yunlong Wang
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Yifei Li
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Xiaoxin Zhao
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Hongwei Wang
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Jun Tan
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Liting Wang
- Biomedical Analysis Center, Third Military Medical University (Army Medical University), 400038, Chongqing, China
| | - Qi Zhou
- Department of Oncology, Fuling Central Hospital of Chongqing City, 408000, Chongqing, China.
| | - Ganfeng Xie
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China.
| | - Houjie Liang
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China.
| | - Juanjuan Ou
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), 400038, Chongqing, China.
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4
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Sun M, Han X, Zhou D, Zhong J, Liu L, Wang Y, Ni J, Shen X, Liang C, Fang H. BIG1 mediates sepsis-induced lung injury by modulating lipid raft-dependent macrophage inflammatory responses. Acta Biochim Biophys Sin (Shanghai) 2021; 53:1088-1097. [PMID: 34153089 DOI: 10.1093/abbs/gmab085] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Indexed: 11/13/2022] Open
Abstract
Sepsis is a systemic inflammatory response syndrome with high mortality. It has been reported that brefeldin A-inhibited guanine nucleotide-exchange factor 1 (BIG1) is involved in the pathogenesis of sepsis. However, the mechanism is not fully elucidated. In the present study, we explored the role of BIG1 in mediating lipid raft-dependent macrophage inflammatory response and its impact on lung injury in murine sepsis. In vitro studies revealed that BIG1 deficiency reduces the upregulation and secretion of tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), and IL-1β and inhibits the activation of the toll-like receptor 4 (TLR4)/myeloid differentiation primary response 88-dependent nuclear factor kappa-B signaling pathway induced by the lipopolysaccharide (LPS) treatment. Further experiments revealed that the inhibitory effects of BIG1 deficiency on LPS-induced inflammation are due to the upregulation of adenosine triphosphate-binding cassette transporter A1. This promotes the free-cholesterol efflux from lipid rafts and results in the reduction of lipid raft TLR4 content. The decrease in TLR4 content in lipid raft thereby inhibits the LPS-induced inflammatory response. Furthermore, using the cecal ligation and puncture-induced polymicrobial sepsis mouse model, we found that conditional knockout (cKO) of the myeloid cell BIG1 significantly reduced the serum concentrations of TNF-α, IL-6, and IL-1β, and downregulated their mRNA expressions in the lungs. Pathological analysis confirmed that the BIG1 cKO alleviated the sepsis-induced lung injury. These results revealed the crucial new role of BIG1 in mediating lipid raft-dependent macrophage inflammatory response. Hence, BIG1 may be a potential promising therapeutic target for the treatment of septic lung injury.
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Affiliation(s)
- Minli Sun
- Department of Anesthesiology, Zhongshan Hospital Affiliated to Fudan University, Shanghai 200031, China
| | - Xiaodan Han
- Department of Anesthesiology, Zhongshan Hospital Affiliated to Fudan University, Shanghai 200031, China
| | - Di Zhou
- Department of Anesthesiology, Zhongshan Hospital Affiliated to Fudan University, Shanghai 200031, China
| | - Jing Zhong
- Department of Anesthesiology, Zhongshan Hospital Affiliated to Fudan University, Shanghai 200031, China
| | - Lixin Liu
- Department of Pharmacology and the Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai 200032, China
| | - Yirui Wang
- Department of Pharmacology and the Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai 200032, China
| | - Jiahui Ni
- Department of Pharmacology and the Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai 200032, China
| | - Xiaoyan Shen
- Department of Pharmacology and the Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai 200032, China
| | - Chao Liang
- Department of Anesthesiology, Zhongshan Hospital Affiliated to Fudan University, Shanghai 200031, China
| | - Hao Fang
- Department of Anesthesiology, Zhongshan Hospital Affiliated to Fudan University, Shanghai 200031, China
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5
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Jiang H. The complex activities of the SET1/MLL complex core subunits in development and disease. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2020; 1863:194560. [PMID: 32302696 DOI: 10.1016/j.bbagrm.2020.194560] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 01/14/2020] [Accepted: 04/09/2020] [Indexed: 12/14/2022]
Abstract
In mammalian cells, the SET1/MLL complexes are the main writers of the H3K4 methyl mark that is associated with active gene expression. The activities of these complexes are critically dependent on the association of the catalytic subunit with their shared core subunits, WDR5, RBBP5, ASH2L, and DPY30, collectively referred as WRAD. In addition, some of these core subunits can bind to proteins other than the SET1/MLL complex components. This review starts with discussion of the molecular activities of these core subunits, with an emphasis on DPY30 in organizing the assembly of the SET1/MLL complexes with other associated factors. This review then focuses on the roles of the core subunits in stem cells and development, as well as in diseased cell states, mainly cancer, and ends with discussion on dissecting the responsible activities of the core subunits and how we may target them for potential disease treatment. This article is part of a Special Issue entitled: The MLL family of proteins in normal development and disease edited by Thomas A Milne.
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Affiliation(s)
- Hao Jiang
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA.
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6
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Abstract
The integration of drugs into nanocarriers favorably altered their pharmacodynamics and pharmacokinetics compared to free drugs, and increased their therapeutic index. However, selective cellular internalization in diseased tissues rather than normal tissues still presents a formidable challenge. In this chapter I will cover solutions involving environment-responsive cell-penetrating peptides (CPPs). I will discuss properties of CPPs as universal cellular uptake enhancers, and the modifications imparted to CPP-modified nanocarriers to confine CPP activation to diseased tissues.
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7
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Newton T, Allison R, Edgar JR, Lumb JH, Rodger CE, Manna PT, Rizo T, Kohl Z, Nygren AOH, Arning L, Schüle R, Depienne C, Goldberg L, Frahm C, Stevanin G, Durr A, Schöls L, Winner B, Beetz C, Reid E. Mechanistic basis of an epistatic interaction reducing age at onset in hereditary spastic paraplegia. Brain 2019; 141:1286-1299. [PMID: 29481671 PMCID: PMC5917785 DOI: 10.1093/brain/awy034] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 01/04/2018] [Indexed: 12/20/2022] Open
Abstract
Many genetic neurological disorders exhibit variable expression within affected families, often exemplified by variations in disease age at onset. Epistatic effects (i.e. effects of modifier genes on the disease gene) may underlie this variation, but the mechanistic basis for such epistatic interactions is rarely understood. Here we report a novel epistatic interaction between SPAST and the contiguous gene DPY30, which modifies age at onset in hereditary spastic paraplegia, a genetic axonopathy. We found that patients with hereditary spastic paraplegia caused by genomic deletions of SPAST that extended into DPY30 had a significantly younger age at onset. We show that, like spastin, the protein encoded by SPAST, the DPY30 protein controls endosomal tubule fission, traffic of mannose 6-phosphate receptors from endosomes to the Golgi, and lysosomal ultrastructural morphology. We propose that additive effects on this pathway explain the reduced age at onset of hereditary spastic paraplegia in patients who are haploinsufficient for both genes.
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Affiliation(s)
- Timothy Newton
- Department of Medical Genetics and Cambridge Institute for Medical Research, University of Cambridge, UK
| | - Rachel Allison
- Department of Medical Genetics and Cambridge Institute for Medical Research, University of Cambridge, UK
| | - James R Edgar
- Department of Clinical Biochemistry and Cambridge Institute for Medical Research, University of Cambridge, Cambridge CB2 0XY, UK
| | - Jennifer H Lumb
- Department of Medical Genetics and Cambridge Institute for Medical Research, University of Cambridge, UK
| | - Catherine E Rodger
- Department of Medical Genetics and Cambridge Institute for Medical Research, University of Cambridge, UK
| | - Paul T Manna
- Department of Clinical Biochemistry and Cambridge Institute for Medical Research, University of Cambridge, Cambridge CB2 0XY, UK
| | - Tania Rizo
- Department of Stem Cell Biology, Friedrich-Alexander University Erlangen-Nuernberg (FAU), Erlangen, Germany
| | - Zacharias Kohl
- Department of Molecular Neurology, Friedrich-Alexander University Erlangen-Nuernberg (FAU), Erlangen, Germany
| | | | - Larissa Arning
- Department of Human Genetics, Ruhr-University, Bochum, Germany
| | - Rebecca Schüle
- Center for Neurology and Hertie Institute for Clinical Brain Research, Eberhard-Karls-University, 72076 Tübingen, Germany.,German Center of Neurodegenerative Diseases (DZNE), 72076 Tübingen, Germany
| | - Christel Depienne
- ICM Brain and Spine Institute, INSERM U1127, CNRS UMR7225, Sorbonne Universites, UPMC Univ Paris VI UMR_S1127, Paris, France.,APHP, Genetic Department, Pitie-Salpêtrière University Hospital, Paris, France
| | - Lisa Goldberg
- Department of Clinical Chemistry and Laboratory Diagnostics, Jena University Hospital, Jena, Germany
| | - Christiane Frahm
- Hans Berger Department of Neurology, Jena University Hospital, Jena, Germany
| | - Giovanni Stevanin
- ICM Brain and Spine Institute, INSERM U1127, CNRS UMR7225, Sorbonne Universites, UPMC Univ Paris VI UMR_S1127, Paris, France.,APHP, Genetic Department, Pitie-Salpêtrière University Hospital, Paris, France.,Ecole Pratique des Hautes Etudes, PSL Research University, Paris, France
| | - Alexandra Durr
- ICM Brain and Spine Institute, INSERM U1127, CNRS UMR7225, Sorbonne Universites, UPMC Univ Paris VI UMR_S1127, Paris, France.,APHP, Genetic Department, Pitie-Salpêtrière University Hospital, Paris, France
| | - Ludger Schöls
- Center for Neurology and Hertie Institute for Clinical Brain Research, Eberhard-Karls-University, 72076 Tübingen, Germany.,German Center of Neurodegenerative Diseases (DZNE), 72076 Tübingen, Germany
| | - Beate Winner
- Department of Molecular Neurology, Friedrich-Alexander University Erlangen-Nuernberg (FAU), Erlangen, Germany
| | - Christian Beetz
- Department of Clinical Chemistry and Laboratory Diagnostics, Jena University Hospital, Jena, Germany
| | - Evan Reid
- Department of Medical Genetics and Cambridge Institute for Medical Research, University of Cambridge, UK
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8
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Watts AJ, Storey KB. Hibernation impacts lysine methylation dynamics in the 13-lined ground squirrel, Ictidomys tridecemlineatus. JOURNAL OF EXPERIMENTAL ZOOLOGY PART 2019; 331:234-244. [PMID: 30767414 DOI: 10.1002/jez.2259] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 01/21/2019] [Accepted: 01/22/2019] [Indexed: 11/11/2022]
Abstract
During winter hibernation in mammals, body temperature falls to near-ambient levels, metabolism shifts to favor lipid oxidation, and metabolic rate is strongly suppressed by inhibiting many ATP-expensive processes (e.g., transcription, translation) for animals in order to survive for many months on limited reserves of body fuels. Regulation of such profound changes (i.e., metabolic rate depression) requires rapid and reversible controls provided by protein posttranslational modifications. Protein lysine methylation provides one mechanism by which the functionality, activity, and stability of cellular proteins and enzymes can be modified for the needs of the hibernator. The present study reports the responses of seven lysine methyltransferases (SMYD2, SUV39H1, SET8, SET7/9, G9a, ASH2L, and RBBP5) in skeletal muscle and liver over seven stages of the torpor/arousal cycle in 13-lined ground squirrels (Ictidomys tridecemlineatus). A tissue-specific and stage-specific analysis revealed significant changes in the protein levels of lysine methyltransferases, methylation patterns on histone H3, histone methyltransferase activity, and methylation of the p53 transcription factor. Enzymes typically increased in protein amount in either torpor, arousal, or the transitory periods. Methylation of histone H3 and p53 typically followed the patterns of the methyltransferase enzymes. Overall, these data show that protein lysine methylation is an important regulator of the mammalian hibernation phenotype.
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Affiliation(s)
- Alexander J Watts
- Department of Biology, Institute of Biochemistry, Carleton University, Ottawa, Canada
| | - Kenneth B Storey
- Department of Biology, Institute of Biochemistry, Carleton University, Ottawa, Canada
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9
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Lorès P, Coutton C, El Khouri E, Stouvenel L, Givelet M, Thomas L, Rode B, Schmitt A, Louis B, Sakheli Z, Chaudhry M, Fernandez-Gonzales A, Mitsialis A, Dacheux D, Wolf JP, Papon JF, Gacon G, Escudier E, Arnoult C, Bonhivers M, Savinov SN, Amselem S, Ray PF, Dulioust E, Touré A. Homozygous missense mutation L673P in adenylate kinase 7 (AK7) leads to primary male infertility and multiple morphological anomalies of the flagella but not to primary ciliary dyskinesia. Hum Mol Genet 2019; 27:1196-1211. [PMID: 29365104 DOI: 10.1093/hmg/ddy034] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 01/16/2018] [Indexed: 02/03/2023] Open
Abstract
Motile cilia and sperm flagella share an extremely conserved microtubule-based cytoskeleton, called the axoneme, which sustains beating and motility of both organelles. Ultra-structural and/or functional defects of this axoneme are well-known to cause primary ciliary dyskinesia (PCD), a disorder characterized by recurrent respiratory tract infections, chronic otitis media, situs inversus, male infertility and in most severe cases, hydrocephalus. Only recently, mutations in genes encoding axonemal proteins with preferential expression in the testis were identified in isolated male infertility; in those cases, individuals displayed severe asthenozoospermia due to Multiple Morphological Abnormalities of the sperm Flagella (MMAF) but not PCD features. In this study, we performed genetic investigation of two siblings presenting MMAF without any respiratory PCD features, and we report the identification of the c.2018T > G (p.Leu673Pro) transversion in AK7, encoding an adenylate kinase, expressed in ciliated tissues and testis. By performing transcript and protein analyses of biological samples from individual carrying the transversion, we demonstrate that this mutation leads to the loss of AK7 protein in sperm cells but not in respiratory ciliated cells, although both cell types carry the mutated transcript and no tissue-specific isoforms were detected. This work therefore, supports the notion that proteins shared by both cilia and sperm flagella may have specific properties and/or function in each organelle, in line with the differences in their mode of assembly and organization. Overall, this work identifies a novel genetic cause of asthenozoospermia due to MMAF and suggests that in humans, more deleterious mutations of AK7 might induce PCD.
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Affiliation(s)
- Patrick Lorès
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
| | - Charles Coutton
- Institut for Advanced Biosciences, INSERM U1209, CNRS UMR 5309, Université Grenoble Alpes, 38000 Grenoble, France.,CHU Grenoble Alpes, UM de Génétique Chromosomique, Grenoble, France
| | - Elma El Khouri
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
| | - Laurence Stouvenel
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
| | - Maëlle Givelet
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
| | - Lucie Thomas
- INSERM UMR S933, Université Pierre et Marie Curie (Paris 6), Paris 75012, France
| | - Baptiste Rode
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
| | - Alain Schmitt
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
| | - Bruno Louis
- Equipe 13, INSERM UMR S955, Faculté de Médecine, Université Paris Est, CNRS ERL7240, Créteil 94000, France
| | - Zeinab Sakheli
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
| | - Marhaba Chaudhry
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
| | | | - Alex Mitsialis
- Division of Newborn Medicine, Children's Hospital Boston, Boston, MA 02115, USA
| | - Denis Dacheux
- Université de Bordeaux, Microbiologie Fondamentale et Pathogénicité, CNRS UMR 5234, Bordeaux, France.,Microbiologie Fondamentale et Pathogénicité, Institut Polytechnique de Bordeaux, UMR-CNRS 5234, F-33000 Bordeaux, France
| | - Jean-Philippe Wolf
- Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France.,Laboratoire d'Histologie Embryologie-Biologie de la Reproduction, GH Cochin Broca Hôtel Dieu, Assistance Publique-Hôpitaux de Paris, Paris 75014, France
| | - Jean-François Papon
- Equipe 13, INSERM UMR S955, Faculté de Médecine, Université Paris Est, CNRS ERL7240, Créteil 94000, France.,Service d'Oto-Rhino-Laryngologie et de Chirurgie Cervico-Maxillo-Faciale, Hôpital Bicêtre, Assistance Publique - Hôpitaux de Paris, Le Kremlin-Bicêtre 94275, France.,Faculté de Médecine, Université Paris-Saclay, Le Kremlin-Bicêtre F-94275, France
| | - Gérard Gacon
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
| | - Estelle Escudier
- INSERM UMR S933, Université Pierre et Marie Curie (Paris 6), Paris 75012, France.,Service de Génétique et d'Embryologie Médicales, Hôpital Armand Trousseau, Assistance Publique - Hôpitaux de Paris, Paris 75012, France
| | - Christophe Arnoult
- Institut for Advanced Biosciences, INSERM U1209, CNRS UMR 5309, Université Grenoble Alpes, 38000 Grenoble, France
| | - Mélanie Bonhivers
- Microbiologie Fondamentale et Pathogénicité, Institut Polytechnique de Bordeaux, UMR-CNRS 5234, F-33000 Bordeaux, France.,Laboratoire d'Histologie Embryologie-Biologie de la Reproduction, GH Cochin Broca Hôtel Dieu, Assistance Publique-Hôpitaux de Paris, Paris 75014, France
| | - Sergey N Savinov
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, MA 01003, USA
| | - Serge Amselem
- INSERM UMR S933, Université Pierre et Marie Curie (Paris 6), Paris 75012, France.,Service de Génétique et d'Embryologie Médicales, Hôpital Armand Trousseau, Assistance Publique - Hôpitaux de Paris, Paris 75012, France
| | - Pierre F Ray
- Institut for Advanced Biosciences, INSERM U1209, CNRS UMR 5309, Université Grenoble Alpes, 38000 Grenoble, France.,CHU de Grenoble, UM GI-DPI, Grenoble F-38000, France
| | - Emmanuel Dulioust
- Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France.,Laboratoire d'Histologie Embryologie-Biologie de la Reproduction, GH Cochin Broca Hôtel Dieu, Assistance Publique-Hôpitaux de Paris, Paris 75014, France
| | - Aminata Touré
- INSERM U1016, Institut Cochin, Paris 75014, France.,Centre National de la Recherche Scientifique UMR8104, Paris 75014, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris 75014, France
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10
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Barrachina F, Anastasiadi D, Jodar M, Castillo J, Estanyol JM, Piferrer F, Oliva R. Identification of a complex population of chromatin-associated proteins in the European sea bass (Dicentrarchus labrax) sperm. Syst Biol Reprod Med 2018; 64:502-517. [PMID: 29939100 DOI: 10.1080/19396368.2018.1482383] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A very common conception about the function of the spermatozoon is that its unique role is to transmit the paternal genome to the next generation. Most of the sperm genome is known to be condensed in many species by protamines, which are small and extremely positively charged proteins (50-70% arginine) with the functions of streamlining the sperm cell and protecting its DNA. However, more recently, it has been shown in mammals that 2-10% of its mature sperm chromatin is also associated to a complex population of histones and chromatin-associated proteins differentially distributed in the genome. These proteins are transferred to the oocyte upon fertilization and may be involved in the epigenetic marking of the paternal genome. However, little information is so far available on the additional potential sperm chromatin proteins present in other protamine-containing non-mammalian vertebrates detected through high-throughput mass spectrometry. Thus, we started the present work with the goal of characterizing the mature sperm proteome of the European sea bass, with a particular focus on the sperm chromatin, chosen as a representative of non-mammalian vertebrate protamine-containing species. Proteins were isolated by acidic extraction from purified sperm cells and from purified sperm nuclei, digested with trypsin, and subsequently the peptides were separated using liquid chromatography and identified through tandem mass spectrometry. A total of 296 proteins were identified. Of interest, the presence of 94 histones and other chromatin-associated proteins was detected, in addition to the protamines. These results provide phylogenetically strategic information, indicating that the coexistence of histones, additional chromatin proteins, and protamines in sperm is not exclusive of mammals, but is also present in other protamine-containing vertebrates. Thus, it indicates that the epigenetic marking of the sperm chromatin, first demonstrated in mammals, could be more fundamental and conserved than previously thought. Abbreviations: AU-PAGE: acetic acid-urea polyacrylamide gel electrophoresis; CPC: chromosomal passenger complex; DTT: dithiothreitol; EGA: embryonic genome activation; FDR: false discovery rate; GO: Gene Ontology; IAA: iodoacetamide; LC: liquid chromatography; LC-MS/MS: liquid chromatography coupled to tandem mass spectrometry; MS: mass spectrometry; MS/MS: tandem mass spectrometry; MW: molecular weight; PAGE: polyacrylamide gel electrophoresis; PBS: phosphate buffered saline; SDS: sodium dodecyl sulfate; SDS-PAGE: sodium dodecyl sulfate polyacrylamide gel electrophoresis; TCA: trichloroacetic acid.
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Affiliation(s)
- Ferran Barrachina
- a Molecular Biology of Reproduction and Development Group, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Faculty of Medicine and Health Sciences , University of Barcelona , Barcelona , Spain.,b Biochemistry and Molecular Genetics Service , Hospital Clínic , Barcelona , Spain
| | - Dafni Anastasiadi
- c Institut de Ciències del Mar , Consejo Superior de Investigaciones Científicas , Barcelona , Spain
| | - Meritxell Jodar
- a Molecular Biology of Reproduction and Development Group, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Faculty of Medicine and Health Sciences , University of Barcelona , Barcelona , Spain.,b Biochemistry and Molecular Genetics Service , Hospital Clínic , Barcelona , Spain
| | - Judit Castillo
- a Molecular Biology of Reproduction and Development Group, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Faculty of Medicine and Health Sciences , University of Barcelona , Barcelona , Spain.,b Biochemistry and Molecular Genetics Service , Hospital Clínic , Barcelona , Spain
| | - Josep Maria Estanyol
- d Proteomics Unit, Scientific and Technological Centers from the University of Barcelona , University of Barcelona , Barcelona , Spain
| | - Francesc Piferrer
- c Institut de Ciències del Mar , Consejo Superior de Investigaciones Científicas , Barcelona , Spain
| | - Rafael Oliva
- a Molecular Biology of Reproduction and Development Group, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Faculty of Medicine and Health Sciences , University of Barcelona , Barcelona , Spain.,b Biochemistry and Molecular Genetics Service , Hospital Clínic , Barcelona , Spain
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11
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Upon Infection, Cellular WD Repeat-Containing Protein 5 (WDR5) Localizes to Cytoplasmic Inclusion Bodies and Enhances Measles Virus Replication. J Virol 2018; 92:JVI.01726-17. [PMID: 29237839 DOI: 10.1128/jvi.01726-17] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 12/06/2017] [Indexed: 12/13/2022] Open
Abstract
Replication of negative-strand RNA viruses occurs in association with discrete cytoplasmic foci called inclusion bodies. Whereas inclusion bodies represent a prominent subcellular structure induced by viral infection, our knowledge of the cellular protein components involved in inclusion body formation and function is limited. Using measles virus-infected HeLa cells, we found that the WD repeat-containing protein 5 (WDR5), a subunit of histone H3 lysine 4 methyltransferases, was selectively recruited to virus-induced inclusion bodies. Furthermore, WDR5 was found in complexes containing viral proteins associated with RNA replication. WDR5 was not detected with mitochondria, stress granules, or other known secretory or endocytic compartments of infected cells. WDR5 deficiency decreased both viral protein production and infectious virus yields. Interferon production was modestly increased in WDR5-deficient cells. Thus, our study identifies WDR5 as a novel viral inclusion body-associated cellular protein and suggests a role for WDR5 in promoting viral replication.IMPORTANCE Measles virus is a human pathogen that remains a global concern, with more than 100,000 measles-related deaths annually despite the availability of an effective vaccine. As measles continues to cause significant morbidity and mortality, understanding the virus-host interactions at the molecular level that affect virus replication efficiency is important for development and optimization of treatment procedures. Measles virus is an RNA virus that encodes six genes and replicates in the cytoplasm of infected cells in discrete cytoplasmic replication bodies, though little is known of the biochemical nature of these structures. Here, we show that the cellular protein WDR5 is enriched in the cytoplasmic viral replication factories and enhances virus growth. WDR5-containing protein complex includes viral proteins responsible for viral RNA replication. Thus, we have identified WDR5 as a host factor that enhances the replication of measles virus.
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12
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Ali A, Tyagi S. Diverse roles of WDR5-RbBP5-ASH2L-DPY30 (WRAD) complex in the functions of the SET1 histone methyltransferase family. J Biosci 2017; 42:155-159. [PMID: 28229975 DOI: 10.1007/s12038-017-9666-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
WD repeat containing protein 5 (WDR5), Retinoblastoma Binding Protein 5 (RbBP5), Absent-Small-Homeotic-2- Like protein (ASH2L), and Dumpy-30 (Dpy30) have been reported to be the integral and shared components of all the SET1 family of histone 3 lysine 4 histone methyltransferase (HMT) complexes. Collectively called the WRAD complex, these proteins are pivotal to the HMT activity of the SET1 complexes. Recent reports highlight the novel non-canonical functions of WRAD in cellular processes other than its well-studied role in histone methylation and gene expression. In this review, we examine the diversity in emerging transcription-independent functions of WRAD.
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Affiliation(s)
- Aamir Ali
- Laboratory of Cell Cycle Regulation, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, India
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13
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Hull R, Oosthuysen B, Cajee UF, Mokgohloa L, Nweke E, Antunes RJ, Coetzer THT, Ntwasa M. The Drosophila retinoblastoma binding protein 6 family member has two isoforms and is potentially involved in embryonic patterning. Int J Mol Sci 2015; 16:10242-66. [PMID: 25955646 PMCID: PMC4463644 DOI: 10.3390/ijms160510242] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 03/13/2015] [Indexed: 12/16/2022] Open
Abstract
The human retinoblastoma binding protein 6 (RBBP6) is implicated in esophageal, lung, hepatocellular and colon cancers. Furthermore, RBBP6 was identified as a strong marker for colon cancer prognosis and as a predisposing factor in familial myeloproliferative neoplasms. Functionally, the mammalian protein interacts with p53 and enhances the activity of Mdm2, the prototypical negative regulator of p53. However, since RBBP6 (known as PACT in mice) exists in multiple isoforms and pact-/- mice exhibit a more severe phenotype than mdm2-/- mutants, it must possess some Mdm2-independent functions. The function of the invertebrate homologue is poorly understood. This is complicated by the absence of the Mdm2 gene in both Drosophila and Caenorhabditis elegans. We have experimentally identified the promoter region of Snama, the Drosophila homologue, analyzed potential transcription factor binding sites and confirmed the existence of an additional isoform. Using band shift and co-immunoprecipitation assays combined with mass spectrometry, we found evidence that this gene may be regulated by, amongst others, DREF, which regulates hundreds of genes related to cell proliferation. The potential transcription factors for Snama fall into distinct functional groups, including anteroposterior embryonic patterning and nucleic acid metabolism. Significantly, previous work in mice shows that pact-/- induces an anteroposterior phenotype in embryos when rescued by simultaneous deletion of p53. Taken together, these observations indicate the significance of RBBP6 proteins in carcinogenesis and in developmental defects.
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Affiliation(s)
- Rodney Hull
- School of Molecular & Cell Biology, University of the Witwatersrand, Johannesburg, South Africa Private Bag 3, WITS-2050 Johannesburg, South Africa.
| | - Brent Oosthuysen
- School of Molecular & Cell Biology, University of the Witwatersrand, Johannesburg, South Africa Private Bag 3, WITS-2050 Johannesburg, South Africa.
| | - Umar-Faruq Cajee
- School of Molecular & Cell Biology, University of the Witwatersrand, Johannesburg, South Africa Private Bag 3, WITS-2050 Johannesburg, South Africa.
| | - Lehlogonolo Mokgohloa
- School of Molecular & Cell Biology, University of the Witwatersrand, Johannesburg, South Africa Private Bag 3, WITS-2050 Johannesburg, South Africa.
| | - Ekene Nweke
- School of Molecular & Cell Biology, University of the Witwatersrand, Johannesburg, South Africa Private Bag 3, WITS-2050 Johannesburg, South Africa.
| | - Ricardo Jorge Antunes
- School of Molecular & Cell Biology, University of the Witwatersrand, Johannesburg, South Africa Private Bag 3, WITS-2050 Johannesburg, South Africa.
| | - Theresa H T Coetzer
- School of Life Sciences, University of KwaZulu-Natal (Pietermaritzburg campus); 3209 Scottsville, South Africa.
| | - Monde Ntwasa
- School of Molecular & Cell Biology, University of the Witwatersrand, Johannesburg, South Africa Private Bag 3, WITS-2050 Johannesburg, South Africa.
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14
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Ross NL, Munsell EV, Sabanayagam C, Sullivan MO. Histone-targeted Polyplexes Avoid Endosomal Escape and Enter the Nucleus During Postmitotic Redistribution of ER Membranes. MOLECULAR THERAPY. NUCLEIC ACIDS 2015; 4:e226. [PMID: 25668340 PMCID: PMC4345312 DOI: 10.1038/mtna.2015.2] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Accepted: 12/31/2014] [Indexed: 11/09/2022]
Abstract
Nonviral gene delivery is a promising therapeutic approach because of its safety and controllability, yet limited gene transfer efficacy is a common issue. Most nonviral strategies rely upon endosomal escape designs; however, endosomal escape is often uncorrelated with improved gene transfer and membranolytic structures are typically cytotoxic. Previously, we showed that histone-targeted polyplexes trafficked to the nucleus through an alternative route involving caveolae and the Golgi and endoplasmic reticulum (ER), using pathways similar to several pathogens. We hypothesized that the efficacy of these polyplexes was due to an increased utilization of native vesicular trafficking as well as regulation by histone effectors. Accordingly, using confocal microscopy and cellular fractionation, we determined that a key effect of histone-targeting was to route polyplexes away from clathrin-mediated recycling pathways by harnessing endomembrane transfer routes regulated by histone methyltransferases. An unprecedented finding was that polyplexes accumulated in Rab6-labeled Golgi/ER vesicles and ultimately shuttled directly into the nucleus during ER-mediated nuclear envelope reassembly. Specifically, super resolution microscopy and fluorescence correlation spectroscopy unequivocally indicated that the polyplexes remained associated with ER vesicles/membranes until mitosis, when they were redistributed into the nucleus. These novel findings highlight alternative mechanisms to subvert endolysosomal trafficking and harness the ER to enhance gene transfer.
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Affiliation(s)
- Nikki L Ross
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware, USA
| | - Erik V Munsell
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware, USA
| | | | - Millicent O Sullivan
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware, USA
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15
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Bailey JK, Fields AT, Cheng K, Lee A, Wagenaar E, Lagrois R, Schmidt B, Xia B, Ma D. WD repeat-containing protein 5 (WDR5) localizes to the midbody and regulates abscission. J Biol Chem 2015; 290:8987-9001. [PMID: 25666610 DOI: 10.1074/jbc.m114.623611] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Indexed: 12/25/2022] Open
Abstract
Cytokinesis partitions the cytoplasm of a parent cell into two daughter cells and is essential for the completion of cell division. The final step of cytokinesis in animal cells is abscission, which is a process leading to the physical separation of two daughter cells. Abscission requires membrane traffic and microtubule disassembly at a specific midbody region called the secondary ingression. Here, we report that WD repeat-containing protein 5 (WDR5), a core subunit of COMPASS/MLL family histone H3 lysine 4 methyltransferase (H3K4MT) complexes, resides at the midbody and associates with a subset of midbody regulatory proteins, including PRC1 and CYK4/MKLP1. Knockdown of WDR5 impairs abscission and increases the incidence of multinucleated cells. Further investigation revealed that the abscission delay is primarily due to slower formation of secondary ingressions in WDR5 knockdown cells. Consistent with these defects, midbody microtubules in WDR5 knockdown cells also display enhanced resistance to depolymerization by nocodazole. Recruitment of WDR5 to the midbody dark zone appears to require integrity of the WDR5 central arginine-binding cavity, as mutations that disrupt histone H3 and MLL1 binding to this pocket also abolish the midbody localization of WDR5. Taken together, these data suggest that WDR5 is specifically targeted to the midbody in the absence of chromatin and that it promotes abscission, perhaps by facilitating midbody microtubule disassembly.
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Affiliation(s)
- Jeffrey K Bailey
- From the Neuroscience Research Institute, Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, California 93106
| | - Alexander T Fields
- From the Neuroscience Research Institute, Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, California 93106
| | - Kaijian Cheng
- From the Neuroscience Research Institute, Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, California 93106
| | - Albert Lee
- From the Neuroscience Research Institute, Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, California 93106
| | - Eric Wagenaar
- From the Neuroscience Research Institute, Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, California 93106
| | - Remy Lagrois
- From the Neuroscience Research Institute, Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, California 93106
| | - Bailey Schmidt
- From the Neuroscience Research Institute, Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, California 93106
| | - Bin Xia
- From the Neuroscience Research Institute, Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, California 93106
| | - Dzwokai Ma
- From the Neuroscience Research Institute, Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, California 93106
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16
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Tremblay V, Zhang P, Chaturvedi CP, Thornton J, Brunzelle JS, Skiniotis G, Shilatifard A, Brand M, Couture JF. Molecular basis for DPY-30 association to COMPASS-like and NURF complexes. Structure 2014; 22:1821-1830. [PMID: 25456412 DOI: 10.1016/j.str.2014.10.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 09/15/2014] [Accepted: 10/06/2014] [Indexed: 01/31/2023]
Abstract
DPY-30 is a subunit of mammalian COMPASS-like complexes (complex of proteins associated with Set1) and regulates global histone H3 Lys-4 trimethylation. Here we report structural evidence showing that the incorporation of DPY-30 into COMPASS-like complexes is mediated by several hydrophobic interactions between an amphipathic α helix located on the C terminus of COMPASS subunit ASH2L and the inner surface of the DPY-30 dimerization/docking (D/D) module. Mutations impairing the interaction between ASH2L and DPY-30 result in a loss of histone H3K4me3 at the β locus control region and cause a delay in erythroid cell terminal differentiation. Using overlay assays, we defined a consensus sequence for DPY-30 binding proteins and found that DPY-30 interacts with BAP18, a subunit of the nucleosome remodeling factor complex. Overall, our results indicate that the ASH2L/DPY-30 complex is important for cell differentiation and provide insights into the ability of DPY-30 to associate with functionally divergent multisubunit complexes.
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Affiliation(s)
- Véronique Tremblay
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, 451 Smyth Road, Ottawa, ON K1H 8M5, Canada
| | - Pamela Zhang
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, 451 Smyth Road, Ottawa, ON K1H 8M5, Canada
| | - Chandra-Prakash Chaturvedi
- The Sprott Center for Stem Cell Research, Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada; Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON K1H 8L6, Canada
| | - Janet Thornton
- Department of Biochemistry and Molecular Genetics, Northwestern University, Searle Building, 320 East Superior Street, Chicago, IL 60611, USA
| | - Joseph S Brunzelle
- Department of Molecular Pharmacology and Biological Chemistry, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Georgios Skiniotis
- Life Sciences Institute and Department of Biological Chemistry, Medical School, University of Michigan, Ann Arbor, MI 48109-2216, USA
| | - Ali Shilatifard
- Department of Biochemistry and Molecular Genetics, Northwestern University, Searle Building, 320 East Superior Street, Chicago, IL 60611, USA
| | - Marjorie Brand
- The Sprott Center for Stem Cell Research, Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada; Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON K1H 8L6, Canada
| | - Jean-François Couture
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, 451 Smyth Road, Ottawa, ON K1H 8M5, Canada.
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17
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Nme family of proteins--clues from simple animals. Naunyn Schmiedebergs Arch Pharmacol 2014; 388:133-42. [PMID: 25042404 DOI: 10.1007/s00210-014-1017-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 07/02/2014] [Indexed: 01/08/2023]
Abstract
Nucleoside-diphosphate kinases (Nme/Nm23/NDPK) are evolutionarily conserved enzymes involved in many biological processes in vertebrates. The biochemical mechanisms of these processes are still largely unknown. The Nme family consists of ten members in humans of which Nme1/2 have been extensively studied in the context of carcinogenesis, especially metastasis formation. Lately, it has been proven that the majority of genes linked to human diseases were already present in species distantly related to humans. Most of cancer-related protein domains appeared during the two main evolutionary transitions-the emergence of unicellular eukaryotes and the transition to multicellular metazoans. In spite of these recent insights, current knowledge about cancer and status of cancer-related genes in simple animals is limited. One possible way of studying human diseases relies on analyzing genes/proteins that cause a certain disease by using model organism that represent the evolutionary level at which these genes have emerged. Therefore, basal metazoans are ideal model organisms for gaining a clearer picture how characteristics and functions of Nme genes changed in the transition to multicellularity and increasing complexity in animals, giving us exciting new evidence of their possible functions in potential pathological conditions in humans.
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18
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Regulating the large Sec7 ARF guanine nucleotide exchange factors: the when, where and how of activation. Cell Mol Life Sci 2014; 71:3419-38. [PMID: 24728583 DOI: 10.1007/s00018-014-1602-7] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Revised: 02/27/2014] [Accepted: 03/03/2014] [Indexed: 10/25/2022]
Abstract
Eukaryotic cells require selective sorting and transport of cargo between intracellular compartments. This is accomplished at least in part by vesicles that bud from a donor compartment, sequestering a subset of resident protein "cargos" destined for transport to an acceptor compartment. A key step in vesicle formation and targeting is the recruitment of specific proteins that form a coat on the outside of the vesicle in a process requiring the activation of regulatory GTPases of the ARF family. Like all such GTPases, ARFs cycle between inactive, GDP-bound, and membrane-associated active, GTP-bound, conformations. And like most regulatory GTPases the activating step is slow and thought to be rate limiting in cells, requiring the use of ARF guanine nucleotide exchange factor (GEFs). ARF GEFs are characterized by the presence of a conserved, catalytic Sec7 domain, though they also contain motifs or additional domains that confer specificity to localization and regulation of activity. These domains have been used to define and classify five different sub-families of ARF GEFs. One of these, the BIG/GBF1 family, includes three proteins that are each key regulators of the secretory pathway. GEF activity initiates the coating of nascent vesicles via the localized generation of activated ARFs and thus these GEFs are the upstream regulators that define the site and timing of vesicle production. Paradoxically, while we have detailed molecular knowledge of how GEFs activate ARFs, we know very little about how GEFs are recruited and/or activated at the right time and place to initiate transport. This review summarizes the current knowledge of GEF regulation and explores the still uncertain mechanisms that position GEFs at "budding ready" membrane sites to generate highly localized activated ARFs.
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19
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Kustatscher G, Hégarat N, Wills KLH, Furlan C, Bukowski-Wills JC, Hochegger H, Rappsilber J. Proteomics of a fuzzy organelle: interphase chromatin. EMBO J 2014; 33:648-64. [PMID: 24534090 PMCID: PMC3983682 DOI: 10.1002/embj.201387614] [Citation(s) in RCA: 50] [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: 12/06/2013] [Revised: 01/12/2014] [Accepted: 01/14/2014] [Indexed: 12/30/2022] Open
Abstract
Chromatin proteins mediate replication, regulate expression, and ensure integrity of the genome. So far, a comprehensive inventory of interphase chromatin has not been determined. This is largely due to its heterogeneous and dynamic composition, which makes conclusive biochemical purification difficult, if not impossible. As a fuzzy organelle, it defies classical organellar proteomics and cannot be described by a single and ultimate list of protein components. Instead, we propose a new approach that provides a quantitative assessment of a protein's probability to function in chromatin. We integrate chromatin composition over a range of different biochemical and biological conditions. This resulted in interphase chromatin probabilities for 7635 human proteins, including 1840 previously uncharacterized proteins. We demonstrate the power of our large-scale data-driven annotation during the analysis of cyclin-dependent kinase (CDK) regulation in chromatin. Quantitative protein ontologies may provide a general alternative to list-based investigations of organelles and complement Gene Ontology.
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Affiliation(s)
- Georg Kustatscher
- Wellcome Trust Centre for Cell Biology, University of EdinburghEdinburgh, UK
| | - Nadia Hégarat
- Genome Damage and Stability Centre, University of SussexBrighton, UK
| | - Karen L H Wills
- Wellcome Trust Centre for Cell Biology, University of EdinburghEdinburgh, UK
| | - Cristina Furlan
- Wellcome Trust Centre for Cell Biology, University of EdinburghEdinburgh, UK
| | | | - Helfrid Hochegger
- Genome Damage and Stability Centre, University of SussexBrighton, UK
| | - Juri Rappsilber
- Wellcome Trust Centre for Cell Biology, University of EdinburghEdinburgh, UK
- Department of Biotechnology, Technische Universität BerlinBerlin, Germany
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20
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Gharechahi J, Pakzad M, Mirshavaladi S, Sharifitabar M, Baharvand H, Salekdeh GH. The effect of Rho-associated kinase inhibition on the proteome pattern of dissociated human embryonic stem cells. MOLECULAR BIOSYSTEMS 2014; 10:640-52. [DOI: 10.1039/c3mb70255c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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21
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Sivadas P, Dienes JM, St Maurice M, Meek WD, Yang P. A flagellar A-kinase anchoring protein with two amphipathic helices forms a structural scaffold in the radial spoke complex. ACTA ACUST UNITED AC 2013; 199:639-51. [PMID: 23148234 PMCID: PMC3494852 DOI: 10.1083/jcb.201111042] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Amphipathic helices in the A-kinase anchoring protein RSP3 bind to spoke proteins involved in the assembly and modulation of the flagellar radial spoke complex, expanding the repertoire of these versatile helical protein motifs. A-kinase anchoring proteins (AKAPs) contain an amphipathic helix (AH) that binds the dimerization and docking (D/D) domain, RIIa, in cAMP-dependent protein kinase A (PKA). Many AKAPs were discovered solely based on the AH–RIIa interaction in vitro. An RIIa or a similar Dpy-30 domain is also present in numerous diverged molecules that are implicated in critical processes as diverse as flagellar beating, membrane trafficking, histone methylation, and stem cell differentiation, yet these molecules remain poorly characterized. Here we demonstrate that an AKAP, RSP3, forms a dimeric structural scaffold in the flagellar radial spoke complex, anchoring through two distinct AHs, the RIIa and Dpy-30 domains, in four non-PKA spoke proteins involved in the assembly and modulation of the complex. Interestingly, one AH can bind both RIIa and Dpy-30 domains in vitro. Thus, AHs and D/D domains constitute a versatile yet potentially promiscuous system for localizing various effector mechanisms. These results greatly expand the current concept about anchoring mechanisms and AKAPs.
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Affiliation(s)
- Priyanka Sivadas
- Department of Biological Sciences, Marquette University, Milwaukee, WI 53201, USA
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The DPY-30 domain and its flanking sequence mediate the assembly and modulation of flagellar radial spoke complexes. Mol Cell Biol 2012; 32:4012-24. [PMID: 22851692 DOI: 10.1128/mcb.06602-11] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
RIIa is known as the dimerization and docking (D/D) domain of the cyclic AMP (cAMP)-dependent protein kinase. However, numerous molecules, including radial spoke protein 2 (RSP2) in Chlamydomonas flagella, also contain an RIIa or a similar DPY-30 domain. To elucidate new roles of D/D domain-containing proteins, we investigated a panel of RSP2 mutants. An RSP2 mutant had paralyzed flagella defective in RSP2 and multiple subunits near the spokehead. New transgenic strains lacking only the DPY-30 domain in RSP2 were also paralyzed. In contrast, motility was restored in strains that lacked only RSP2's calmodulin-binding C-terminal region. These cells swam normally in dim light but could not maintain typical swimming trajectories under bright illumination. In both deletion transgenic strains, the subunits near the spokehead were restored, but their firm attachment to the spokestalk required the DPY-30 domain. We postulate that the DPY-30-helix dimer is a conserved two-prong linker, required for normal motility, organizing duplicated subunits in the radial spoke stalk and formation of a symmetrical spokehead. Further, the dispensable calmodulin-binding region appears to fine-tune the spokehead for regulation of "steering" motility in the green algae. Thus, in general, D/D domains may function to localize molecular modules for both the assembly and modulation of macromolecular complexes.
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23
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Reilly MJ, Larsen JD, Sullivan MO. Polyplexes traffic through caveolae to the Golgi and endoplasmic reticulum en route to the nucleus. Mol Pharm 2012; 9:1280-90. [PMID: 22420286 DOI: 10.1021/mp200583d] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The cellular machinery involved in the internalization of nonviral gene carriers and their subsequent trafficking to the nucleus directly impacts their therapeutic efficiency. Hence, identifying key endocytic pathways and organelles that contribute to the successful transfer of polyplexes to the nucleus generates new opportunities for improving carrier design. Previously, we showed that histone H3 tail peptides encoding a sequence known to participate in chromatin activation exhibit synergistic gene delivery activity with poly(ethylenimine) (PEI). Polyplexes containing H3 and PEI exhibited a reduced dependence on endocytic pathways that trafficked to lysosomes, and had enhanced sensitivity to an inhibitor associated with retrograde trafficking through the Golgi apparatus. Thus, we sought to determine whether caveolar uptake and transport through the Golgi and/or endoplasmic reticulum (ER) preceded nuclear delivery. By the use of a panel of chemical endocytic inhibitors, we determined that H3 polyplexes utilized caveolar pathways to a greater degree than PEI polyplexes. Caveolae-mediated endocytosis was found to be a productive route for gene expression by the H3/PEI-pDNA polyplexes, consistent with previous studies of polymer-mediated gene delivery. Additionally, the polyplexes substantially colocalized within the ER after only 5 min of incubation, and utilized retrograde Golgi-to-ER pathways at levels similar to pathogens known to traffic by these routes during infection. The results of this study have expanded our understanding of how caveolar polyplexes are trafficked to cell nuclei, and provide new evidence for the role of Golgi-ER pathways in transfection. These findings suggest new design criteria and opportunities to stragetically target nonviral gene delivery vehicles.
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Affiliation(s)
- Meghan J Reilly
- Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716, United States
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24
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25
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Exit from the trans-Golgi network: from molecules to mechanisms. Curr Opin Cell Biol 2011; 23:443-51. [PMID: 21550789 DOI: 10.1016/j.ceb.2011.03.013] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 03/07/2011] [Accepted: 03/22/2011] [Indexed: 11/23/2022]
Abstract
The trans-Golgi network is a major sorting platform of the secretory pathway from which proteins and lipids, both newly synthesized and retrieved from endocytic compartments, are targeted to different destinations. These sorting processes occur during the formation of pleomorphic tubular-vesicular carriers. The past years have provided insights into basic mechanisms coordinating the spatial and temporal organization of machineries necessary for the segregation of membrane components into distinct microdomains, for the bending, elongation, and fission of corresponding membranes, thus revealing a complex interplay of protein-protein and protein-lipid interactions.
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26
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Cao F, Chen Y, Cierpicki T, Liu Y, Basrur V, Lei M, Dou Y. An Ash2L/RbBP5 heterodimer stimulates the MLL1 methyltransferase activity through coordinated substrate interactions with the MLL1 SET domain. PLoS One 2010; 5:e14102. [PMID: 21124902 PMCID: PMC2990719 DOI: 10.1371/journal.pone.0014102] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2010] [Accepted: 10/31/2010] [Indexed: 11/24/2022] Open
Abstract
Histone H3 lysine 4 (K4) methylation is a prevalent mark associated with transcription activation and is mainly catalyzed by the MLL/SET1 family histone methyltransferases. A common feature of the mammalian MLL/SET1 complexes is the presence of three core components (RbBP5, Ash2L and WDR5) and a catalytic subunit containing a SET domain. Unlike most other histone lysine methyltransferases, all four proteins are required for efficient H3 K4 methylation. Despite extensive efforts, mechanisms for how three core components regulate MLL/SET1 methyltransferase activity remain elusive. Here we show that a heterodimer of Ash2L and RbBP5 has intrinsic histone methyltransferase activity. This activity requires the highly conserved SPRY domain of Ash2L and a short peptide of RbBP5. We demonstrate that both Ash2L and the MLL1 SET domain are capable of binding to S-adenosyl-L- [methyl-3H] methionine in the MLL1 core complex. Mutations in the MLL1 SET domain that fail to support overall H3 K4 methylation also compromise SAM binding by Ash2L. Taken together, our results show that the Ash2L/RbBP5 heterodimer plays a critical role in the overall catalysis of MLL1 mediated H3 K4 methylation. The results we describe here provide mechanistic insights for unique regulation of the MLL1 methyltransferase activity. It suggests that both Ash2L/RbBP5 and the MLL1 SET domain make direct contacts with the substrates and contribute to the formation of a joint catalytic center. Given the shared core configuration among all MLL/SET1 family HMTs, it will be interesting to test whether the mechanism we describe here can be generalized to other MLL/SET1 family members in the future.
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Affiliation(s)
- Fang Cao
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Yong Chen
- Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Tomasz Cierpicki
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Yifan Liu
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Venkatesha Basrur
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Ming Lei
- Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan, United States of America
- Howard Hughes Medical Institute, University of Michigan, Ann Arbor, Michigan, United States of America
- * E-mail: (YD); (ML)
| | - Yali Dou
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, United States of America
- Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan, United States of America
- * E-mail: (YD); (ML)
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27
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Xia B, Joubert A, Groves B, Vo K, Ashraf D, Djavaherian D, Awe J, Xiong Y, Cherfils J, Ma D. Modulation of cell adhesion and migration by the histone methyltransferase subunit mDpy-30 and its interacting proteins. PLoS One 2010; 5:e11771. [PMID: 20668708 PMCID: PMC2909266 DOI: 10.1371/journal.pone.0011771] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Accepted: 06/24/2010] [Indexed: 12/18/2022] Open
Abstract
We have previously shown that a subset of mDpy-30, an accessory subunit of the nuclear histone H3 lysine 4 methyltransferase (H3K4MT) complex, also localizes at the trans-Golgi network (TGN), where its recruitment is mediated by the TGN-localized ARF guanine nucleotide exchange factor (ArfGEF) BIG1. Depletion of mDpy-30 inhibits the endosome-to-TGN transport of internalized CIMPR receptors and concurrently promotes their accumulation at the cell protrusion. These observations suggest mDpy-30 may play a novel role at the crossroads of endosomal trafficking, nuclear transcription and adhesion/migration. Here we provide novel mechanistic and functional insight into this association. First, we demonstrate a direct interaction between mDpy-30 and BIG1 and locate the binding region in the N-terminus of BIG1. Second, we provide evidence that the depletion or overexpression of mDpy-30 enhances or inhibits cellular adhesion/migration of glioma cells in vitro, respectively. A similar increase in cell adhesion/migration is observed in cells with reduced levels of BIG1 or other H3K4MT subunits. Third, knockdown of mDpy-30, BIG1, or the RbBP5 H3K4MT subunit increases the targeting of beta1 integrin to cell protrusions, and suppression of H3K4MT activity by depleting mDpy-30 or RbBP5 leads to increased protein and mRNA levels of beta1 integrin. Moreover, stimulation of cell adhesion/migration via mDpy-30 knockdown is abolished after treating cells with a function-blocking antibody to beta1 integrin. Taken together, these data indicate that mDpy-30 and its interacting proteins function as a novel class of cellular adhesion/migration modulators partially by affecting the subcellular distribution of endosomal compartments as well as the expression of key adhesion/migration proteins such as beta1 integrin.
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Affiliation(s)
- Bin Xia
- Department of Pediatrics, Sichuan University, West China Second University Hospital, Chengdu, China
- Department of Molecular, Cellular, and Developmental Biology, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Alexandra Joubert
- Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, Gif sur Yvette, France
| | - Benjamin Groves
- Department of Molecular, Cellular, and Developmental Biology, University of California Santa Barbara, Santa Barbara, California, United States of America
- Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Kevin Vo
- Department of Molecular, Cellular, and Developmental Biology, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Davin Ashraf
- Department of Molecular, Cellular, and Developmental Biology, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Derek Djavaherian
- Department of Molecular, Cellular, and Developmental Biology, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Jason Awe
- Department of Molecular, Cellular, and Developmental Biology, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Ying Xiong
- Department of Pediatrics, Sichuan University, West China Second University Hospital, Chengdu, China
| | - Jacqueline Cherfils
- Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, Gif sur Yvette, France
| | - Dzwokai Ma
- Department of Molecular, Cellular, and Developmental Biology, University of California Santa Barbara, Santa Barbara, California, United States of America
- Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, California, United States of America
- * E-mail:
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28
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Lone M, Kungl T, Koper A, Bottenberg W, Kammerer R, Klein M, Sweeney ST, Auburn RP, O'Kane CJ, Prokop A. The nuclear protein Waharan is required for endosomal-lysosomal trafficking in Drosophila. J Cell Sci 2010; 123:2369-74. [PMID: 20551180 DOI: 10.1242/jcs.060582] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Here we report Drosophila Waharan (Wah), a 170-kD predominantly nuclear protein with two potential human homologues, as a newly identified regulator of endosomal trafficking. Wah is required for neuromuscular-junction development and muscle integrity. In muscles, knockdown of Wah caused novel accumulations of tightly packed electron-dense tubules, which we termed 'sausage bodies'. Our data suggest that sausage bodies coincide with sites at which ubiquitylated proteins and a number of endosomal and lysosomal markers co-accumulate. Furthermore, loss of Wah function generated loss of the acidic LysoTracker compartment. Together with data demonstrating that Wah acts earlier in the trafficking pathway than the Escrt-III component Drosophila Shrb (snf7 in Schizosaccharomyces pombe), our results indicate that Wah is essential for endocytic trafficking at the late endosome. Highly unexpected phenotypes result from Wah knockdown, in that the distribution of ubiquitylated cargos and endolysosomal morphologies are affected despite Wah being a predominant nuclear protein. This finding suggests the existence of a relationship between nuclear functions and endolysosomal trafficking. Future studies of Wah function will give us insights into this interesting phenomenon.
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Affiliation(s)
- Mohiddin Lone
- Faculty of Life Sciences, The University of Manchester, Oxford Road, M13 9PT Manchester, UK
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29
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Smith KR, Oliver PL, Lumb MJ, Arancibia-Carcamo IL, Revilla-Sanchez R, Brandon NJ, Moss SJ, Kittler JT. Identification and characterisation of a Maf1/Macoco protein complex that interacts with GABAA receptors in neurons. Mol Cell Neurosci 2010; 44:330-41. [PMID: 20417281 DOI: 10.1016/j.mcn.2010.04.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2009] [Revised: 03/09/2010] [Accepted: 04/09/2010] [Indexed: 01/16/2023] Open
Abstract
The majority of fast inhibitory synaptic transmission in the mammalian nervous system is mediated by GABA(A) receptors (GABA(A)Rs). Here we report a novel interaction between the protein Maf1 and GABA(A)R beta-subunit intracellular domains. We find Maf1 to be highly expressed in brain and enriched in the hippocampus and cortex. In heterologous cells and neurons we show Maf1 co-localises with GABA(A)Rs in intracellular compartments and at the cell surface. In neurons, Maf1 is found localised in the cytoplasm in dendrites, partially overlapping with GABA(A)Rs and inhibitory synapses and in addition is enriched in the neuronal nucleus. We also report that Maf1 interacts with a novel coiled-coil domain containing protein that we have called Macoco (for Maf1 interacting coiled-coil protein). Like Maf1, Macoco can also be found localised to inhibitory synapses and directly interacts with GABA(A)Rs. Expressing Macoco in neurons increases surface GABA(A)R levels. Our results suggest that Maf1 and Macoco are novel GABA(A)R interacting proteins important for regulating GABA(A)R surface expression and GABA(A)R signalling in the brain.
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Affiliation(s)
- Katharine R Smith
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, London, WC1E 6BT, UK
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30
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Rishal I, Michaelevski I, Rozenbaum M, Shinder V, Medzihradszky KF, Burlingame AL, Fainzilber M. Axoplasm isolation from peripheral nerve. Dev Neurobiol 2010; 70:126-33. [PMID: 19885832 DOI: 10.1002/dneu.20755] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Localized changes in the composition of axonal cytoplasm (axoplasm) are critical for many biological processes, including axon guidance, responses to injury, neurite outgrowth, and axon-glia interactions. Biochemical and molecular studies of these mechanisms have been heavily focused on in vitro systems because of the difficulty of obtaining subcellular extracts from mammalian tissues in vivo. As in vitro systems might not replicate the in vivo situation, reliable methods of axoplasm extraction from whole nerve would be helpful for mechanistic studies on axons. Here we develop and evaluate a new procedure for preparation of axoplasm from rat peripheral nerve, based on incubation of separated short segements of nerve fascicles in hypotonic medium to separate myelin and lyse nonaxonal structures, followed by extraction of the remaining axon-enriched material. We show that this new procedure reduces serum and glial cell contamination and facilitates proteomic analyses of axonal contents.
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Affiliation(s)
- Ida Rishal
- Department of Biological Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel
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31
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Research highlights. Nat Cell Biol 2009. [DOI: 10.1038/ncb1009-1180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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