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Nuclear envelope

Melanie Ott, Débora Marques, Christina Funk, Susanne M Bailer
BACKGROUND: Herpes simplex virus type 1 (HSV1), a member of the alphaherpesvirinae, can cause recurrent facial lesions and encephalitis. Two membrane envelopment processes, one at the inner nuclear membrane and a second at cytoplasmic membranes are crucial for a productive viral infection. Depending on the subfamily, herpesviruses encode more than 11 different transmembrane proteins including members of the tail-anchored protein family. HSV1 encodes three tail-anchored proteins pUL34, pUL56 and pUS9 characterized by a single hydrophobic region positioned at their C-terminal end that needs to be released from the ribosome prior to posttranslational membrane insertion...
October 20, 2016: Virology Journal
Alexandra Proft, Bart Spiesschaert, Satoko Izume, Selina Taferner, Maik J Lehmann, Walid Azab
The serine-threonine protein kinase encoded by US3 gene (pUS3) of alphaherpesviruses was shown to modulate actin reorganization, cell-to-cell spread, and virus egress in a number of virus species. However, the role of the US3 orthologues of equine herpesvirus type 1 and 4 (EHV-1 and EHV-4) has not yet been studied. Here, we show that US3 is not essential for virus replication in vitro. However, growth rates and plaque diameters of a US3-deleted EHV-1 and a mutant in which the catalytic active site was destroyed were significantly reduced when compared with parental and revertant viruses or a virus in which EHV-1 US3 was replaced with the corresponding EHV-4 gene...
October 12, 2016: Viruses
Nursel Gül, Nuri Yiğit, Fulya Saygılı, Ebru Demirel, Ceren Geniş
We used transmission electron microscopy to examine the cytotoxic effects of the second-generation anticoagulant rodenticides difenacoum and brodifacoum on rat liver. A single dose of difenacoum or brodifacoum was administered to rats by gastric gavage and liver samples were taken after 24 h, four days or seven days. In the livers of rats treated with difenacoum for 24 h, hepatocytes typically showed increased numbers of lysosomes, as well as enlargement of both the perinuclear space and the cisternae of the rough endoplasmic reticulum (RER), while sinusoids were irregularly shaped and contained Kupffer cells...
September 1, 2016: Arhiv za Higijenu Rada i Toksikologiju
Katie N Myers, Giancarlo Barone, Anil Ganesh, Christopher J Staples, Anna E Howard, Ryan D Beveridge, Sarah Maslen, J Mark Skehel, Spencer J Collis
It was recently discovered that vertebrate genomes contain multiple endogenised nucleotide sequences derived from the non-retroviral RNA bornavirus. Strikingly, some of these elements have been evolutionary maintained as open reading frames in host genomes for over 40 million years, suggesting that some endogenised bornavirus-derived elements (EBL) might encode functional proteins. EBLN1 is one such element established through endogenisation of the bornavirus N gene (BDV N). Here, we functionally characterise human EBLN1 as a novel regulator of genome stability...
October 14, 2016: Scientific Reports
Dipen Rajgor, Jonathan G Hanley, Catherine M Shanahan
Nesprins are highly conserved spectrin-repeat containing scaffold proteins pre-dominantly known to function at the nuclear envelope (NE). However, nesprin isoforms are emerging with localizations and scaffolding functions at sites away from the NE, suggesting their functions are more diverse than originally thought. In this study, we combined nesprin-1 coimmunoprecipitations with mass spectrometry to identify novel nesprin-1 binding partners for isoforms that localize to subcellular compartments beyond the NE...
October 12, 2016: Molecular Biology of the Cell
Brant M Webster, David J Thaller, Jens Jäger, Sarah E Ochmann, Sapan Borah, C Patrick Lusk
The integrity of the nuclear envelope barrier relies on membrane remodeling by the ESCRTs, which seal nuclear envelope holes and contribute to the quality control of nuclear pore complexes (NPCs); whether these processes are mechanistically related remains poorly defined. Here, we show that the ESCRT-II/III chimera, Chm7, is recruited to a nuclear envelope subdomain that expands upon inhibition of NPC assembly and is required for the formation of the storage of improperly assembled NPCs (SINC) compartment. Recruitment to sites of NPC assembly is mediated by its ESCRT-II domain and the LAP2-emerin-MAN1 (LEM) family of integral inner nuclear membrane proteins, Heh1 and Heh2...
October 12, 2016: EMBO Journal
William C Plaxton
Leucoplasts are colorless plastids of nonphotosynthetic plant tissues that support a variety of anabolic roles, particularly the biosynthesis of long-chain fatty acids in storage tissues of developing oil seeds. They also perform other important metabolic functions including the biosynthesis of amino acids and tetrapyrrole compounds. Leucoplasts use a complex set of membrane carriers and channels to actively translocate nuclear-encoded precursor proteins from the cytosol, while exchanging various metabolites with the cytosol...
2017: Methods in Molecular Biology
Lizette du Plessis, John T Soley
Head shaping in mammalian sperm is regulated by a number of factors including acrosome formation, nuclear condensation and the action of the microtubular manchette. A role has also been suggested for the attendant Sertoli cells and the perinuclear theca (PT). In comparison, relatively little information is available on this topic in birds and the presence of a PT per se has not been described in this vertebrate order. This study revealed that a similar combination of factors contributed to head shaping in the ostrich, emu and rhea, although the Sertoli cells seem to play a limited role in ratites...
September 28, 2016: Tissue & Cell
Yiyan He, Jie Zhou, Shengnan Ma, Yu Nie, Dong Yue, Qian Jiang, Aisha Roshan Mohamed Wali, James Zhenggui Tang, Zhongwei Gu
Systemic gene delivery is a complicated and multistep process that confronts numerous biological barriers. It remains a formidable challenge to exploit a single gene carrier with multiple features to combat all obstacles collectively. Herein, a multi-responsive "turn-on" polyelectrolyte complex (DNA/OEI-SSx /HA-SS-COOH, DSS) delivery system is demonstrated with a sequential self-assembly of disulfide-conjugated oligoethylenimine (OEI-SSx ) and disulfide bond-modified hyaluronic acid envelope (HA-SS-COOH) that can combat multiple biological barriers collectively when administered intravenously...
September 26, 2016: Advanced Healthcare Materials
Stephen D Thorpe, Myriam Charpentier
The last decade has seen rapid advances in our understanding of the proteins of the nuclear envelope, which have multiple roles including positioning the nucleus, maintaining its structural organisation, and in events ranging from mitosis and meiosis to chromatin positioning and gene expression. Diverse new and stimulating results relating to nuclear organisation and genome function from across kingdoms were presented in a session stream entitled "Dynamic Organisation of the Nucleus" at this year's Society of Experimental Biology (SEB) meeting in Brighton, UK (July 2016)...
October 7, 2016: Nucleus
Alberto Garcia, Jose F Rodriguez Matas, Manuela T Raimondi
Recent evidence suggests that mechanical deformation of the cell nucleus regulates the nuclear import of the transcriptional activators of genes involved in primary physiological cell responses such as stem cell differentiation. In addition, this nuclear mechanosensing response is de-regulated in pathological states, such as cancer and neurodegeneration. One hypothesis that could greatly advance the field is that the deformation of the nuclear envelope activates nuclear pore complexes through a direct mechanical link...
October 10, 2016: Integrative Biology: Quantitative Biosciences From Nano to Macro
Toshiaki Sasao
This paper analyzes the cost and efficiency of waste disposal associated with the Great East Japan Earthquake. The following two analyses were performed: (1) a popular parametric approach, which is an ordinary least squares (OLS) method to estimate the factors that affect the disposal costs; (2) a non-parametric approach, which is a two-stage data envelopment analysis (DEA) to analyze the efficiency of each municipality and clarify the best performance of the disaster waste management. Our results indicate that a higher recycling rate of disaster waste and a larger amount of tsunami sediments decrease the average disposal costs...
October 3, 2016: Waste Management
Jonathon D Brzezinski, Apexa Modi, Mengdan Liu, Monica J Roth
: Murine Leukemia Virus (MLV) p12, encoded within Gag, binds the viral preintegration complex (PIC) to the mitotic chromatin. This acts to anchor the viral PIC in the nucleus as the nuclear envelope reforms post-mitosis. Mutations within the p12 C-terminus (p12 PM13-15) block early stages in viral replication. Within the p12 PM13 region (p12 60PSPMA65), our studies indicated that chromatin tethering is not detected when the wild type p12 protein (M63) was expressed as a GFP fusion, however, constructs bearing p12-I63 were tethered...
October 5, 2016: Journal of Virology
Xuan Cao, Emad Moeendarbary, Philipp Isermann, Patricia M Davidson, Xiao Wang, Michelle B Chen, Anya K Burkart, Jan Lammerding, Roger D Kamm, Vivek B Shenoy
It is now evident that the cell nucleus undergoes dramatic shape changes during important cellular processes such as cell transmigration through extracellular matrix and endothelium. Recent experimental data suggest that during cell transmigration the deformability of the nucleus could be a limiting factor, and the morphological and structural alterations that the nucleus encounters can perturb genomic organization that in turn influences cellular behavior. Despite its importance, a biophysical model that connects the experimentally observed nuclear morphological changes to the underlying biophysical factors during transmigration through small constrictions is still lacking...
October 4, 2016: Biophysical Journal
Catalina Ana Rosselló, Lisa Lindström, Johan Glindre, Greta Eklund, Maria Alvarado-Kristensson
The cytosolic role of γ-tubulin as a microtubule organizer has been studied thoroughly, but its nuclear function is poorly understood. Here, we show that γ-tubulin is located throughout the chromatin of demembranated Xenopus laevis sperm and, as the nucleus is formed, γ-tubulin recruits lamin B3 and nuclear membranes. Immunodepletion of γ-tubulin impairs X. laevis assembly of both the lamina and the nuclear membrane. During nuclear formation in mammalian cell lines, γ-tubulin establishes a cellular protein boundary around chromatin that coordinates nuclear assembly of the daughter nuclei...
September 2016: Heliyon
Jan Lammerding, Katarina Wolf
Cells exhibit transient nuclear envelope ruptures during interphase, but the responsible biophysical processes remain unclear. In this issue, Hatch and Hetzer (2016. J. Cell Biol. show that actin fibers constrict the nucleus, causing chromatin protrusions and nuclear membrane ruptures at sites with nuclear lamina defects.
October 10, 2016: Journal of Cell Biology
Emily M Hatch, Martin W Hetzer
Repeated rounds of nuclear envelope (NE) rupture and repair have been observed in laminopathy and cancer cells and result in intermittent loss of nucleus compartmentalization. Currently, the causes of NE rupture are unclear. Here, we show that NE rupture in cancer cells relies on the assembly of contractile actin bundles that interact with the nucleus via the linker of nucleoskeleton and cytoskeleton (LINC) complex. We found that the loss of actin bundles or the LINC complex did not rescue nuclear lamina defects, a previously identified determinant of nuclear membrane stability, but did decrease the number and size of chromatin hernias...
October 10, 2016: Journal of Cell Biology
D P Froman
Four premises for rooster sperm preservation were outlined previously. Understanding mitochondrial Ca cycling in terms of whole-cell Ca flux was one premise. The present work tested the hypothesis that sperm mitochondria can be damaged by intracellular as well as extracellular Ca. Sperm were washed by centrifugation through 12% (wt/vol) Sperm were washed by centrifugation through 12%(at/vol) Accudenz to procure sperm at a physiological concentration within a chemically-defined suspension. Five solutions were tested...
August 2016: Journal of Animal Science
Farouk M Nasser, Ahmed M Shouman, Mohammed S ElSheemy, Mohammed A Lotfi, Waseem Aboulela, Mohamed El Ghoneimy, Mohammed Abdelwahab, Ahmed I Shoukry, Waleed Ghoneima, Hany Morsi, Hesham Badawy
OBJECTIVES: To compare outcome of dismembered-pyeloplasty in infants with and without external nephro-ureteric stent (ENUS) for treatment of congenital ureteropelvic junction obstruction (UPJ-O). METHODS: This is a parallel, randomized comparative study between October 2013 and September 2014. 30 infants ≤6 months old with UPJ-O indicated for dismembered-pyeloplasty were randomly assigned (block randomization, closed envelope method) into two groups; group-A (stentless) and group-B (ENUS)...
September 28, 2016: Urology
Thomas C Mettenleiter
Herpesviruses use a vesicle-mediated transfer of intranuclearly assembled nucleocapsids through the nuclear envelope (NE) for final maturation in the cytoplasm. The molecular basis for this novel vesicular nucleo-cytoplasmic transport is beginning to be elucidated in detail. The heterodimeric viral nuclear egress complex (NEC), conserved within the classical herpesviruses, mediates vesicle formation from the inner nuclear membrane (INM) by polymerization into a hexagonal lattice followed by fusion of the vesicle membrane with the outer nuclear membrane (ONM)...
2016: Viruses
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