1 the Nucleoporin ELYS Regulates Nuclear Size by Controlling NPC
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Dynamic Molecular Linkers of the Genome: the First Decade of SMC Proteins
Downloaded from genesdev.cshlp.org on October 8, 2021 - Published by Cold Spring Harbor Laboratory Press REVIEW Dynamic molecular linkers of the genome: the first decade of SMC proteins Ana Losada1 and Tatsuya Hirano2,3 1Spanish National Cancer Center (CNIO), Madrid E-28029, Spain; 2Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA Structural maintenance of chromosomes (SMC) proteins in eukaryotes. The proposed actions of cohesin and con- are chromosomal ATPases, highly conserved from bac- densins offer a plausible, if not complete, explanation for teria to humans, that play fundamental roles in many the sudden appearance of thread-like “substances” (the aspects of higher-order chromosome organization and chromosomes) and their longitudinal splitting during dynamics. In eukaryotes, SMC1 and SMC3 act as the mitosis, first described by Walther Flemming (1882). core of the cohesin complexes that mediate sister chro- Remarkably, SMC proteins are conserved among the matid cohesion, whereas SMC2 and SMC4 function as three phyla of life, indicating that the basic strategy of the core of the condensin complexes that are essential chromosome organization may be evolutionarily con- for chromosome assembly and segregation. Another served from bacteria to humans. An emerging theme is complex containing SMC5 and SMC6 is implicated in that SMC proteins are dynamic molecular linkers of the DNA repair and checkpoint responses. The SMC com- genome that actively fold, tether, and manipulate DNA plexes form unique ring- or V-shaped structures with strands. Their diverse functions range far beyond chro- long coiled-coil arms, and function as ATP-modulated, mosome segregation, and involve nearly all aspects of dynamic molecular linkers of the genome. -
Building the Interphase Nucleus: a Study on the Kinetics of 3D Chromosome Formation, Temporal Relation to Active Transcription, and the Role of Nuclear Rnas
University of Massachusetts Medical School eScholarship@UMMS GSBS Dissertations and Theses Graduate School of Biomedical Sciences 2020-07-28 Building the Interphase Nucleus: A study on the kinetics of 3D chromosome formation, temporal relation to active transcription, and the role of nuclear RNAs Kristin N. Abramo University of Massachusetts Medical School Let us know how access to this document benefits ou.y Follow this and additional works at: https://escholarship.umassmed.edu/gsbs_diss Part of the Bioinformatics Commons, Cell Biology Commons, Computational Biology Commons, Genomics Commons, Laboratory and Basic Science Research Commons, Molecular Biology Commons, Molecular Genetics Commons, and the Systems Biology Commons Repository Citation Abramo KN. (2020). Building the Interphase Nucleus: A study on the kinetics of 3D chromosome formation, temporal relation to active transcription, and the role of nuclear RNAs. GSBS Dissertations and Theses. https://doi.org/10.13028/a9gd-gw44. Retrieved from https://escholarship.umassmed.edu/ gsbs_diss/1099 Creative Commons License This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License This material is brought to you by eScholarship@UMMS. It has been accepted for inclusion in GSBS Dissertations and Theses by an authorized administrator of eScholarship@UMMS. For more information, please contact [email protected]. BUILDING THE INTERPHASE NUCLEUS: A STUDY ON THE KINETICS OF 3D CHROMOSOME FORMATION, TEMPORAL RELATION TO ACTIVE TRANSCRIPTION, AND THE ROLE OF NUCLEAR RNAS A Dissertation Presented By KRISTIN N. ABRAMO Submitted to the Faculty of the University of Massachusetts Graduate School of Biomedical Sciences, Worcester in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSPOPHY July 28, 2020 Program in Systems Biology, Interdisciplinary Graduate Program BUILDING THE INTERPHASE NUCLEUS: A STUDY ON THE KINETICS OF 3D CHROMOSOME FORMATION, TEMPORAL RELATION TO ACTIVE TRANSCRIPTION, AND THE ROLE OF NUCLEAR RNAS A Dissertation Presented By KRISTIN N. -
Understanding Molecular Functions of the SMC5/6 Complex
G C A T T A C G G C A T genes Review Scaffolding for Repair: Understanding Molecular Functions of the SMC5/6 Complex Mariana Diaz 1,2 and Ales Pecinka 1,* ID 1 Institute of Experimental Botany of the Czech Academy of Sciences (IEB), Centre of the Region Haná for Biotechnological and Agricultural Research, Šlechtitelu˚ 31, 77900 Olomouc-Holice, Czech Republic 2 Max Planck Institute for Plant Breeding Research (MPIPZ), Carl-von-Linné-Weg 10, 50829 Cologne, Germany; [email protected] * Correspondence: [email protected]; Tel.: +420-585-238-709 Received: 15 November 2017; Accepted: 4 January 2018; Published: 12 January 2018 Abstract: Chromosome organization, dynamics and stability are required for successful passage through cellular generations and transmission of genetic information to offspring. The key components involved are Structural maintenance of chromosomes (SMC) complexes. Cohesin complex ensures proper chromatid alignment, condensin complex chromosome condensation and the SMC5/6 complex is specialized in the maintenance of genome stability. Here we summarize recent knowledge on the composition and molecular functions of SMC5/6 complex. SMC5/6 complex was originally identified based on the sensitivity of its mutants to genotoxic stress but there is increasing number of studies demonstrating its roles in the control of DNA replication, sister chromatid resolution and genomic location-dependent promotion or suppression of homologous recombination. Some of these functions appear to be due to a very dynamic interaction with cohesin or other repair complexes. Studies in Arabidopsis indicate that, besides its canonical function in repair of damaged DNA, the SMC5/6 complex plays important roles in regulating plant development, abiotic stress responses, suppression of autoimmune responses and sexual reproduction. -
Nuclear Non-Chromatin Proteinaceous Structures: Their Role in the Organization and Function of the Interphase Nucleus
J. Cell Set. 44, 395-435 (1980) 295 Printed in Great Britain © Company of BiologitU Limited igSo NUCLEAR NON-CHROMATIN PROTEINACEOUS STRUCTURES: THEIR ROLE IN THE ORGANIZATION AND FUNCTION OF THE INTERPHASE NUCLEUS PAUL S. AGUTTER* AND JONATHAN C. W. RICHARDSONf • Department of Biological Sciences, Napier College, Colinton Road, Edinburgh EH10 5DT, Scotland and f Department of Physiology and Pharmacology, University of St Andrews, Bute Medical Buildings, St Andrews, Fife, Scotland REVIEW ARTICLE: CONTENTS I. INTRODUCTION page 39s (1) Historical background 395 (2) Nomenclature 397 II. NUCLEAR PROTEIN MATRIX AND NUCLEAR GHOSTS 397 (1) Isolation 397 (2) Composition 398 (3) Ultrastructure 401 (4) Enzyme activities associated with the nuclear protein matrix 405 (5) Contractility of the nuclear protein matrix 405 (6) Functions associated with the nucleai protein matrix 408 III. SUBFRACTIONS OF THE NUCLEAR PROTEIN MATRIX 411 (A) The pore-lamina 411 (1) Isolation 411 (2) Composition 413 (3) Ultrastructure 414 (4) The molecular organization of the pore-lamina 417 (B) Other subfractions 419 IV. COMPOSITIONAL AND FUNCTIONAL DIFFERENCES BETWEEN THE PORE-LAMINA AND THE REMAINDER OF THE NUCLEAR PROTEIN MATRIX 42O V. PROSPECTS FOR FURTHER RESEARCH 422 (1) The role of the nuclear protein matrix in nucleo-cytoplasmic RNA transport 422 (2) Relevance of a knowledge of factors affecting the stability of the intra- nuclear regions of the matrix to the further development of methods for isolation of the nuclear envelope 423 (3) Fate of the nuclear matrix during mitosis 423 I. INTRODUCTION (1) Historical background Since 1949 there have been several accounts of a 'honeycomb layer' or 'nuclear cortex' in the nuclei of lower eukaryotes (Callan, Randall & Tomlin, 1949; Callan & Tomlin, 1950; Harris & James, 1952; Pappas, 1956; Beams, Tahmisian, Devine & 26-2 396 P. -
Dynamic Force-Induced Direct Dissociation of Protein Complexes in a Nuclear Body in Living Cells
ARTICLE Received 13 Jan 2012 | Accepted 26 Apr 2012 | Published 29 May 2012 DOI: 10.1038/ncomms1873 Dynamic force-induced direct dissociation of protein complexes in a nuclear body in living cells Yeh-Chuin Poh1, Sergey P. Shevtsov2, Farhan Chowdhury1, Douglas C. Wu1, Sungsoo Na3, Miroslav Dundr2 & Ning Wang1 Despite past progress in understanding mechanisms of cellular mechanotransduction, it is unclear whether a local surface force can directly alter nuclear functions without intermediate biochemical cascades. Here we show that a local dynamic force via integrins results in direct displacements of coilin and SMN proteins in Cajal bodies and direct dissociation of coilin-SMN associated complexes. Spontaneous movements of coilin increase more than those of SMN in the same Cajal body after dynamic force application. Fluorescence resonance energy transfer changes of coilin-SMN depend on force magnitude, an intact F-actin, cytoskeletal tension, Lamin A/C, or substrate rigidity. Other protein pairs in Cajal bodies exhibit different magnitudes of fluorescence resonance energy transfer. Dynamic cyclic force induces tiny phase lags between various protein pairs in Cajal bodies, suggesting viscoelastic interactions between them. These findings demonstrate that dynamic force-induced direct structural changes of protein complexes in Cajal bodies may represent a unique mechanism of mechanotransduction that impacts on nuclear functions involved in gene expression. 1 Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Champaign, Illinois 61801, USA. 2 Department of Cell Biology, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois 60064, USA. 3 Department of Biomedical Engineering, Indiana University-Purdue University Indianapolis, Indiana 46202, USA. -
Nature Reviews Molecular Cell Biology
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Sussex Research Online Murray and Carr, Page 1 Smc5/6: a link between DNA-repair and unidirectional replication? Johanne M. Murray and Antony M. Carr* Genome Damage and Stability Centre, University of Sussex, Brighton, Sussex BN1 9RQ, UK. * Corresponding author. [email protected]. Tel +44 (1)1273 678122 Murray and Carr, Page 2 Preface Of the three structural maintenance of chromosome (SMC) complexes, two regulate chromosome dynamics. The third, Smc5/6, functions in homologous recombination and the completion of DNA replication. The literature suggests that Smc5/6 coordinates DNA repair, in part through post-translational modification of uncharacterised target proteins that can dictate their subcellular localization. Smc5/6 functions to establish DNA damage-dependent cohesion. A nucleolar-specific Smc5/6 function has been proposed because Smc5/6 complex yeast mutants display penetrant phenotypes of rDNA instability. rDNA repeats are replicated unidirectionally. Here we propose that unidirectional replication, combined with global Smc5/6 complex functions can explain the apparent rDNA specificity. Introduction SMC complexes regulate high order chromosome structure. Cohesin maintains the link between replicated sister chromosomes that is essential for equal mitotic segregation. Condensin compacts chromatin prior to mitosis. Smc5/6 complex plays a poorly characterised role in DNA repair. The extensive architectural, structural and sequence similarity between the three SMC complexes suggest common modes of action. There is also an intriguing conservation of domain architecture with bacterial Sbc nucleases and the Mre11-Rad50-Nbs1 (MRN) complex (see Ref.1). -
Prb and Condensin—Local Control of Global Chromosome Structure
Downloaded from genesdev.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press PERSPECTIVE pRb and condensin—local control of global chromosome structure Brigitte D. Lavoie1 Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada Rb mutants exhibit aneuploidy and aberrant chromo- chromosome condensation, DNA repair, and transcrip- some structure during mitosis. In this issue of Genes & tional regulation (for a recent review, see Hirano 2005b). Development, a new paper from Longworth and col- A second breakthrough was the biochemical isolation of leagues (pp. 1011–1024) describes both physical and condensin, a five-subunit complex required for the in functional interactions between Drosophila Rbf1 and vitro condensation of DNA (Hirano et al. 1997) and in the dCAP-D3 subunit of condensin II. This work directly vivo segregation of chromosomes (Hagstrom and Meyer implicates the Rb family proteins in mitotic chromo- 2003 and references therein). While eukaryotic con- some condensation and suggests that a failure in target- densins are conserved from yeast to humans, two related ing condensin II to chromatin underlies the aneuploidy condensin complexes, termed condensin I and II, have in rbf1 mutants. been identified in multicellular organisms (Table 1). Each complex comprises two core SMC proteins, a klei- sin family protein and two HEAT repeat proteins, and Discovery of condensins while both condensins have been implicated in multiple aspects of chromosome metabolism, how each complex Over a hundred genomes have been sequenced to date, contributes to mitotic chromosome structure is poorly including the human genome in 2001, yet the mecha- understood. nisms underlying eukaryotic genome transmission re- main poorly defined. -
Effects of Hyperthermia on Chromatin Condensation and Nucleoli
(CANCER RESEARCH 49, 1254-1260. March 1. 1989] Effects of Hyperthermia on Chromatin Condensation and Nucleoli Disintegration as Visualized by Induction of Premature Chromosome Condensation in Interphase Mammalian Cells1 George E. Iliakis and Gabriel E. Pantelias2 Thomas Jefferson University Hospital, Department of Radiation Oncology and Nuclear Medicine, Philadelphia, Pennsylvania 19107 [G. E. I., G. E. P.]; and the National Research Center for Physical Sciences "Demokritos", Aghia Paraskevi Attikis, Athens, Greece [G. E. P.] ABSTRACT nuclei (13), in chromatin (14-17), and in nuclear matrices (18, 19), and it was proposed that disruption of important nuclear The effects of hyperthermia on chromatin condensation and nucleoli processes by this nuclear protein binding may be the reason for disintegration, as visualized by induction of premature chromosome con cell killing (17). Beyond cell killing the excess nuclear proteins densation in interphase mammalian cells, was studied in exponentially have been implicated in the inhibition of DNA synthesis (5, 6) growing and plateau phase Chinese hamster ovary cells. Exposure to heat reduced the ability of interphase chromatin to condense and the and the inhibition of DNA repair following both ionizing (20, ability of the nucleolar organizing region to disintegrate under the influ 21) and uv (22) irradiation. It is thought that inhibition of ence of factors provided by mitotic cells when fused to interphase cells. these cellular functions may be due to alterations induced in Based on these effects treated cells were classified in three categories. chromatin conformation and in particular to restriction of DNA Category 1 contained cells able to condense their chromatin and disinte supercoiling changes as a result of protein addition to the grate the nucleolar organizing region. -
Snapshot: Cellular Bodies David L
SnapShot: Cellular Bodies David L. Spector Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA Number/ Typical Size Marker Body Name Description Image Cell and Shape Protein Involved in snRNP and snoRNP biogenesis and 0.1–2.0 µm; Cajal Body 0–6 Coilin posttranscriptional modification of newly assembled round spliceosomal snRNAs. 20S core Contains ubiquitin conjugates, the proteolytically active 0.2–1.2 µm; catalytic Clastosome 0–3 20S core and 19S regulatory complexes of the 26S irregular component of proteasome, and protein substrates of the proteasome. proteasome Contains several factors involved in 3′ cleavage of mRNAs. 0.2–1.0 µm; Cleavage Body 1–4 CstF 64 kDa ?20% contain newly synthesized RNA. Some cleavage round bodies localize adjacent to Cajal and PML bodies. Nuclear Contains proteins for pre-mRNA processing. Involved in Speckle or 0.8–1.8 µm; SC35, 25–50 the storage, assembly, and/or modification of pre-mRNA Interchromatin irregular SF2/ASF splicing factors. Granule Cluster Induced by heat shock response. Associates with Nuclear Stress 0.3–3.0 µm; satellite III repeats on human chromosome 9q12 and 2–10 HSF1 Body irregular other pericentromeric regions; recruits various RNA- binding proteins. Contains several transcription factors (Oct1/PTF) and 1.0–1.5 µm; OPT Domain 1–3 PTF RNA transcripts; predominant in late G1 cells. Often round Nuclear Bodies localizes close to nucleolus. 0.5 µm; Contains several RNA-binding proteins and nuclear- Paraspeckle 10–20 p54nrb, PSP1 round retained CTN-RNA. Cap on surface of nucleolus; found mainly in transformed Perinucleolar 0.3–1.0 µm; 1–4 hnRNPI (PTB) cells. -
Separate Roles for Chromatin and Lamins in Nuclear Mechanics
Nucleus ISSN: 1949-1034 (Print) 1949-1042 (Online) Journal homepage: https://www.tandfonline.com/loi/kncl20 Separate roles for chromatin and lamins in nuclear mechanics Andrew D. Stephens, Edward J. Banigan & John F. Marko To cite this article: Andrew D. Stephens, Edward J. Banigan & John F. Marko (2018) Separate roles for chromatin and lamins in nuclear mechanics, Nucleus, 9:1, 119-124, DOI: 10.1080/19491034.2017.1414118 To link to this article: https://doi.org/10.1080/19491034.2017.1414118 © 2018 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group© Andrew D. Stephens, Edward J. Banigan and John F. Marko Accepted author version posted online: 11 Dec 2017. Published online: 28 Dec 2017. Submit your article to this journal Article views: 1662 View related articles View Crossmark data Citing articles: 13 View citing articles Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=kncl20 NUCLEUS 2018, VOL. 9, NO. 1, 119–124 https://doi.org/10.1080/19491034.2017.1414118 EXTRA VIEW Separate roles for chromatin and lamins in nuclear mechanics Andrew D. Stephens a, Edward J. Baniganb,c, and John F. Markoa,b aDepartment of Molecular Biosciences, Northwestern University, Evanston, Illinois, USA; bDepartment of Physics and Astronomy, Northwestern University, Evanston, Illinois, USA; cInstitute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, Massachusetts ABSTRACT ARTICLE HISTORY The cell nucleus houses, protects, and arranges the genome within the cell. Therefore, nuclear Received 31 August 2017 mechanics and morphology are important for dictating gene regulation, and these properties are Revised 29 November 2017 perturbed in many human diseases, such as cancers and progerias. -
Paraspeckles: Possible Nuclear Hubs by the RNA for the RNA
BioMol Concepts, Vol. 3 (2012), pp. 415–428 • Copyright © by Walter de Gruyter • Berlin • Boston. DOI 10.1515/bmc-2012-0017 Review Paraspeckles: possible nuclear hubs by the RNA for the RNA Tetsuro Hirose 1, * and Shinichi Nakagawa 2 Introduction 1 Biomedicinal Information Research Center , National Institute of Advanced Industrial Science and Technology, The eukaryotic cell nucleus is highly compartmentalized. 2-4-7 Aomi, Koutou 135-0064, Tokyo , Japan More than 10 membraneless subnuclear organelles have 2 RNA Biology Laboratory , RIKEN Advanced Research been identifi ed (1, 2) . These so-called nuclear bodies exist Institute, 2-1 Hirosawa, Wako 351-0198 , Japan in the interchromosomal space, where they are enriched in multiple nuclear regulatory factors, such as transcription and * Corresponding author RNA-processing factors. These factors are thought to serve e-mail: [email protected] as specialized hubs for various nuclear events, including transcriptional regulation and RNA processing (3, 4) . Some nuclear bodies serve as sites for the biogenesis of macromo- Abstract lecular machineries, such as ribosomes and spliceosomes. Multiple cancer cell types show striking alterations in their The mammalian cell nucleus is a highly compartmental- nuclear body organization, including changes in the numbers, ized system in which multiple subnuclear structures, called shapes and sizes of certain nuclear bodies (5) . The structural nuclear bodies, exist in the nucleoplasmic spaces. Some of complexity and dynamics of nuclear bodies have been impli- the nuclear bodies contain specifi c long non-coding RNAs cated in the regulation of complex gene expression pathways (ncRNAs) as their components, and may serve as sites for in mammalian cells. -
Condensins Exert Force on Chromatin-Nuclear Envelope Tethers to Mediate Nucleoplasmic Reticulum Formation in Drosophila Melanogaster
INVESTIGATION Condensins Exert Force on Chromatin-Nuclear Envelope Tethers to Mediate Nucleoplasmic Reticulum Formation in Drosophila melanogaster Julianna Bozler,* Huy Q. Nguyen,* Gregory C. Rogers,† and Giovanni Bosco*,1 *Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, and †Department of Cellular and Molecular Medicine, University of Arizona Cancer Center, University of Arizona, Tucson, Arizona 85724 ABSTRACT Although the nuclear envelope is known primarily for its role as a boundary between the KEYWORDS nucleus and cytoplasm in eukaryotes, it plays a vital and dynamic role in many cellular processes. Studies of nuclear nuclear structure have revealed tissue-specific changes in nuclear envelope architecture, suggesting that its architecture three-dimensional structure contributes to its functionality. Despite the importance of the nuclear envelope, chromatin force the factors that regulate and maintain nuclear envelope shape remain largely unexplored. The nuclear nucleus envelope makes extensive and dynamic interactions with the underlying chromatin. Given this inexorable chromatin link between chromatin and the nuclear envelope, it is possible that local and global chromatin organization compaction reciprocally impact nuclear envelope form and function. In this study, we use Drosophila salivary glands to nuclear envelope show that the three-dimensional structure of the nuclear envelope can be altered with condensin II- mediated chromatin condensation. Both naturally occurring and engineered chromatin-envelope interac- tions are sufficient to allow chromatin compaction forces to drive distortions of the nuclear envelope. Weakening of the nuclear lamina further enhanced envelope remodeling, suggesting that envelope struc- ture is capable of counterbalancing chromatin compaction forces. Our experiments reveal that the nucle- oplasmic reticulum is born of the nuclear envelope and remains dynamic in that they can be reabsorbed into the nuclear envelope.