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https://www.readbyqxmd.com/read/28904194/a-distinct-mechanism-for-the-formation-of-the-ribonucleoprotein-complex-of-the-tomato-spotted-wilt-virus
#1
Yu Guo, Baocheng Liu, Zhenzhen Ding, Guobang Li, Meizi Liu, Dantong Zhu, Yuna Sun, Shishang Dong, Zhiyong Lou
The tomato spotted wilt virus (TSWV) belongs to the Tospovirus genus of the Bunyaviridae family and represents the sole plant-infecting group within bunyavirus. TSWV encodes a nucleocapsid protein (N) which encapsidates the RNA genome to form a ribonucleoprotein complex (RNP). In addition, the N has multiple roles during the infection of plant cells. Here, we report the crystal structure of the full-length TSWV N. The N features a body domain consisting of an N- and C-lobe. These lobes clamp a positively charged groove which may constitute the RNA binding site...
September 13, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28903457/the-lifecycle-of-the-ebola-virus-in-host-cells
#2
REVIEW
Dong-Shan Yu, Tian-Hao Weng, Xiao-Xin Wu, Frederick X C Wang, Xiang-Yun Lu, Hai-Bo Wu, Nan-Ping Wu, Lan-Juan Li, Hang-Ping Yao
Ebola haemorrhagic fever causes deadly disease in humans and non-human primates resulting from infection with the Ebola virus (EBOV) genus of the family Filoviridae. However, the mechanisms of EBOV lifecycle in host cells, including viral entry, membrane fusion, RNP formation, GP-tetherin interaction, and VP40-inner leaflet association remain poorly understood. This review describes the biological functions of EBOV proteins and their roles in the lifecycle, summarizes the factors related to EBOV proteins or RNA expression throughout the different phases, and reviews advances with regards to the molecular events and mechanisms of the EBOV lifecycle...
August 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28894082/chronic-inflammatory-demyelinating-polyneuropathy-cidp-an-uncommon-manifestation-of-systemic-lupus-erythematosus-sle
#3
Hrudya Abraham, Jose Kuzhively, Syed W Rizvi
BACKGROUND Chronic inflammatory demyelinating polyneuropathy (CIDP) is an uncommon manifestation of systemic lupus erythematosus (SLE). We report a case of SLE presenting as CIDP and discuss the diagnosis, management, and prognosis of CIDP. CASE REPORT A 40-year-old woman with a past medical history of SLE treated with hydroxychloroquine presented with bilateral, progressive, ascending, sensory and motor neuropathy. Physical examination showed weakness and reduced temperature of all extremities, reduced pinprick and vibration sense of the distal extremities, loss of reflexes, and walking with a wide-based unsteady gait...
September 12, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28884477/fragile-x-granules-are-a-family-of-axonal-ribonucleoprotein-particles-with-circuit-dependent-protein-composition-and-mrna-cargos
#4
Eunice Chyung, Hannah F LeBlanc, Justin R Fallon, Michael R Akins
Local axonal protein synthesis plays a crucial role in the formation and function of neuronal circuits. Understanding the role of this mechanism in specific circuits requires identifying the protein composition and mRNA cargos of the ribonucleoprotein particles (RNPs) that form the substrate for axonal translation. FXGs (Fragile X granules) are axonal RNPs present in a stereotyped subset of mature axons in the intact brain that contain one or more of the Fragile X related (FXR) proteins (FMRP, FXR2P, and FXR1P) along with mRNA and ribosomes...
September 7, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28883156/structural-insights-into-the-interaction-of-the-nuclear-exosome-helicase-mtr4-with-the-pre-ribosomal-protein-nop53
#5
Sebastian Falk, Jan-Niklas Tants, Jerôme Basquin, Matthias Thoms, Ed Hurt, Michael Sattler, Elena Conti
The nuclear exosome and the associated RNA helicase Mtr4 participate in the processing of several ribonucleoprotein particles (RNP), including the maturation of the large ribosomal subunit (60S). S. cerevisiae Mtr4 interacts directly with Nop53, a ribosomal biogenesis factor present in late pre-60S particles containing precursors of the 5.8S rRNA. The Mtr4-Nop53 interaction plays a pivotal role in the maturation of the 5.8S rRNA, providing a physical link between the nuclear exosome and the pre-60S RNP. An analogous interaction between Mtr4 and another ribosome biogenesis factor, Utp18, directs the exosome to an earlier pre-ribosomal particle...
September 7, 2017: RNA
https://www.readbyqxmd.com/read/28879678/a-diversity-oriented-library-of-fluorophore-modified-receptors-constructed-from-a-chemical-library-of-synthetic-fluorophores
#6
Shun Nakano, Tomoki Tamura, Raj Kumar Das, Eiji Nakata, Young-Tae Chang, Takashi Morii
One of the key determinants to successfully obtain a useful biosensor is wide variation of fluorophores attached to a given receptor. Thus, use of a larger fluorophore-modified receptor library provides a higher probability of obtaining a practically useful biosensor. However, no effective method has yet been developed for constructing such a diverse library of fluorophore-modified receptors. Herein, we report a method for constructing fluorophore-modified receptors using a chemical library of synthetic fluorophores with a thiol-reactive group...
September 6, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28872759/hijacking-of-the-nucleolar-protein-fibrillarin-by-tgb1-is-required-for-cell-to-cell-movement-of-barley-stripe-mosaic-virus
#7
Zhenggang Li, Yongliang Zhang, Zhihao Jiang, Xuejiao Jin, Kun Zhang, Xianbing Wang, Chenggui Han, Jialin Yu, Dawei Li
Barley stripe mosaic virus (BSMV) TGB1 is a multifunctional movement protein with RNA binding, ATPase, and helicase activities that mainly localizes to the plasmodesmata (PD) in infected cells. Here we show that TGB1 localizes to the nucleus and the nucleolus, as well as the cytoplasm, and that TGB1 nuclear-cytoplasmic trafficking is required for BSMV cell-to-cell movement. Prediction analyses and laser scanning confocal microscopy (LSCM) experiments verified that TGB1 has a nucleolar localization signal (NoLS) (aa 95-104) and a nuclear localization signal (NLS) (aa 227-238)...
September 5, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28864092/facts-and-controversies-in-mixed-connective-tissue-disease
#8
REVIEW
Julia Martínez-Barrio, Lara Valor, F Javier López-Longo
Mixed connective tissue disease (MCTD) is a systemic autoimmune rheumatic disease (SARD) characterised by the combination of clinical manifestations of systemic lupus erythematosus (SLE), cutaneous systemic sclerosis (SSc) and polymyositis-dermatomyositis, in the presence of elevated titers of anti-U1-RNP antibodies. Main symptoms of the disease are polyarthritis, hand oedema, Raynaud's phenomenon, sclerodactyly, myositis and oesophageal hypomobility. Although widely discussed, most authors today accept MCTD as an independent entity...
August 29, 2017: Medicina Clínica
https://www.readbyqxmd.com/read/28855635/highly-efficient-dna-free-gene-disruption-in-the-agricultural-pest-ceratitis-capitata-by-crispr-cas9-ribonucleoprotein-complexes
#9
Angela Meccariello, Simona Maria Monti, Alessandra Romanelli, Rita Colonna, Pasquale Primo, Maria Grazia Inghilterra, Giuseppe Del Corsano, Antonio Ramaglia, Giovanni Iazzetti, Antonia Chiarore, Francesco Patti, Svenia D Heinze, Marco Salvemini, Helen Lindsay, Elena Chiavacci, Alexa Burger, Mark D Robinson, Christian Mosimann, Daniel Bopp, Giuseppe Saccone
The Mediterranean fruitfly Ceratitis capitata (medfly) is an invasive agricultural pest of high economic impact and has become an emerging model for developing new genetic control strategies as an alternative to insecticides. Here, we report the successful adaptation of CRISPR-Cas9-based gene disruption in the medfly by injecting in vitro pre-assembled, solubilized Cas9 ribonucleoprotein complexes (RNPs) loaded with gene-specific single guide RNAs (sgRNA) into early embryos. When targeting the eye pigmentation gene white eye (we), a high rate of somatic mosaicism in surviving G0 adults was observed...
August 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28851621/pulmonary-arterial-hypertension-associated-with-systemic-lupus-erythematosus-results-from-the-french-pulmonary-hypertension-registry
#10
Eric Hachulla, Xavier Jais, Gaël Cinquetti, Pierre Clerson, Laurence Rottat, David Launay, Vincent Cottin, Gilbert Habib, Grégoire Prevot, Céline Chabanne, Eléna Foïs, Zahir Amoura, Luc Mouthon, Véronique Le Guern, David Montani, Gérald Simonneau, Marc Humbert, Vincent Sobanski, Olivier Sitbon
BACKGROUND: Pulmonary arterial hypertension (PAH) is a rare complication of systemic lupus erythematosus (SLE). METHODS: We identified all patients with SLE and PAH (SLE-PAH) who were enrolled in the French Pulmonary Hypertension Registry with a diagnosis confirmed by right heart catheterization (RHC). A control group of 101 patients with SLE without known PAH was selected from SLE expert centers participating in the Pulmonary Hypertension Registry. Survival was estimated by the Kaplan-Meier method...
August 26, 2017: Chest
https://www.readbyqxmd.com/read/28815538/long-noncoding-rnas-in-the-yeast-s-%C3%A2-cerevisiae
#11
Rachel O Niederer, Evan P Hass, David C Zappulla
Long noncoding RNAs have recently been discovered to comprise a sizeable fraction of the RNA World. The scope of their functions, physical organization, and disease relevance remain in the early stages of characterization. Although many thousands of lncRNA transcripts recently have been found to emanate from the expansive DNA between protein-coding genes in animals, there are also hundreds that have been found in simple eukaryotes. Furthermore, lncRNAs have been found in the bacterial and archaeal branches of the tree of life, suggesting they are ubiquitous...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28814512/zoonotic-risk-pathogenesis-and-transmission-of-avian-origin-h3n2-canine-influenza-virus
#12
Hailiang Sun, Sherry Blackmon, Guohua Yang, Kaitlyn Waters, Tao Li, Ratanaporn Tangwangvivat, Yifei Xu, Daniel Shyu, Feng Wen, Jim Cooley, Lucy Senter, Xiaoxu Lin, Richard Jarman, Larry Hanson, Richard Webby, Xiu-Feng Wan
Two subtypes of influenza A virus (IAV), avian-origin canine influenza virus H3N2 (CIV-H3N2) and equine-origin CIV-H3N8, are enzootic in the canine population. Dogs have demonstrated seroconversion to diverse IAVs and naturally occurring reassortants of CIV-H3N2 and the 2009 H1N1 pandemic virus (pdmH1N1) have been isolated. We conducted a thorough phenotypic evaluation of CIV-H3N2 in order to assess its threat to human health. Using ferret-generated antisera we determined that CIV-H3N2 is antigenically distinct from contemporary human H3N2 IAVs, suggesting there may be minimal herd immunity in humans...
August 16, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28808137/regulatory-rnps-a-novel-class-of-ribonucleoproteins-that-potentially-contribute-to-ribosome-heterogeneity
#13
Aaron R Poole, Ian Vicino, Hironori Adachi, Yi-Tao Yu, Michael D Hebert
Many ribonucleoproteins (RNPs), which are comprised of noncoding RNA and associated proteins, are involved in essential cellular processes such as translation and pre-mRNA splicing. One class of RNP is the small Cajal body-specific RNP (scaRNP), which contributes to the biogenesis of small nuclear RNPs (snRNPs) that are central components of the spliceosome. Three scaRNAs are internally processed, generating stable nucleolus-enriched RNAs of unknown function. Here, we provide data that show that these RNAs become part of RNPs we term regulatory RNPs (regRNPs)...
September 15, 2017: Biology Open
https://www.readbyqxmd.com/read/28801028/convergent-evolution-of-germ-granule-nucleators-a-hypothesis
#14
Arpita Kulkarni, Cassandra G Extavour
Germ cells have been considered "the ultimate stem cell" because they alone, during normal development of sexually reproducing organisms, are able to give rise to all organismal cell types. Morphological descriptions of a specialized cytoplasm termed 'germ plasm' and associated electron dense ribonucleoprotein (RNP) structures called 'germ granules' within germ cells date back as early as the 1800s. Both germ plasm and germ granules are implicated in germ line specification across metazoans. However, at a molecular level, little is currently understood about the molecular mechanisms that assemble these entities in germ cells...
July 19, 2017: Stem Cell Research
https://www.readbyqxmd.com/read/28777080/toscana-virus-nucleoprotein-oligomer-organization-observed-in-solution
#15
Amal Baklouti, Adeline Goulet, Julie Lichière, Bruno Canard, Rémi N Charrel, François Ferron, Bruno Coutard, Nicolas Papageorgiou
Toscana virus (TOSV) is an arthropod-borne virus belonging to the Phlebovirus genus within the Bunyaviridae family. As in other bunyaviruses, the genome of TOSV is made up of three RNA segments. They are encapsidated by the nucleoprotein (N), which also plays an essential role in virus replication. To date, crystallographic structures of phlebovirus N have systematically revealed closed-ring organizations which do not fully match the filamentous organization of the ribonucleoprotein (RNP) complex observed by electron microscopy...
August 1, 2017: Acta Crystallographica. Section D, Structural Biology
https://www.readbyqxmd.com/read/28770711/chinese-lupus-treatment-and-research-group-cstar-registry-x-family-history-in-relation-to-lupus-clinical-and-immunological-manifestations
#16
Xiaomei Leng, Mengtao Li, Xiangpei Li, Xiao Zhang, Shengyun Liu, Lijun Wu, Li Ma, Liqi Bi, Xiaoxia Zuo, Lingyun Sun, Cibo Huang, Jiuliang Zhao, Yan Zhao, Xiaofeng Zeng
OBJECTIVES: This study aimed to examine the associations between family history and clinical manifestations and immunologic characteristics of lupus in China. METHODS: Based on their family history, lupus patients from the Chinese lupus treatment and research group (CSTAR) registry were categorised: familial lupus (FL), family history of other rheumatic disorders (RD), and sporadic lupus (SL). Demographic data, clinical manifestations, and laboratory data were compared among these three groups...
July 7, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28766049/usnrnp-biogenesis-mechanisms-and-regulation
#17
REVIEW
Oliver J Gruss, Rajyalakshmi Meduri, Maximilian Schilling, Utz Fischer
Macromolecular complexes composed of proteins or proteins and nucleic acids rather than individual macromolecules mediate many cellular activities. Maintenance of these activities is essential for cell viability and requires the coordinated production of the individual complex components as well as their faithful incorporation into functional entities. Failure of complex assembly may have fatal consequences and can cause severe diseases. While many macromolecular complexes can form spontaneously in vitro, they often require aid from assembly factors including assembly chaperones in the crowded cellular environment...
August 1, 2017: Chromosoma
https://www.readbyqxmd.com/read/28762061/direct-antiglobulin-coombs-test-in-systemic-lupus-erythematosus-patients
#18
Thelma Skare, Leandro Picelli, Thiago Alberto G Dos Santos, Renato Nisihara
The objective of the study is to study the positivity of Coombs test or direct antiglobulin test (DAT) in systemic lupus erythematosus (SLE) patients and its relationship with disease's clinical and serological profile. Retrospective study of 373 SLE patients seen at single Rheumatology Unit. Epidemiological data (age, gender, age at disease onset, auto declared ethnic background and tobacco use), clinical (malar rash, photosensitivity, oral ulcers, discoid lesions, serositis, glomerulonephritis, convulsions, psychosis, hemolytic anemia, leukopenia, lymphocytopenia and arthritis), and serological profile (anti ds DNA, anti Ro/SS-A; anti La/SS-B, Anti RNP, Anti Sm, aCl (anticardiolipin) IgG, aCl Ig M, LA or lupus anticoagulant, rheumatoid factor and direct Coombs) were collected...
July 31, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28758638/influenza-virus-recruits-host-protein-kinase-c-to-control-assembly-and-activity-of-its-replication-machinery
#19
Arindam Mondal, Anthony R Dawson, Gregory K Potts, Elyse C Freiberger, Steven F Baker, Lindsey A Moser, Kristen A Bernard, Joshua J Coon, Andrew Mehle
Influenza virus expresses transcripts early in infection and transitions towards genome replication at later time points. This process requires de novo assembly of the viral replication machinery, large ribonucleoprotein complexes (RNPs) composed of the viral polymerase, genomic RNA and oligomeric nucleoprotein (NP). Despite the central role of RNPs during infection, the factors dictating where and when they assemble are poorly understood. Here we demonstrate that human protein kinase C (PKC) family members regulate RNP assembly...
July 31, 2017: ELife
https://www.readbyqxmd.com/read/28747322/ribonucleoprotein-purification-and-characterization-using-rna-mango
#20
Shyam Ss Panchapakesan, Matthew L Ferguson, Eric J Hayden, Xin Chen, Aaron A Hoskins, Peter J Unrau
The characterization of RNA-protein complexes (RNPs) is a difficult but increasingly important problem in modern biology. By combining the compact RNA Mango aptamer with a fluorogenic thiazole orange desthiobiotin (TO1-Dtb or TO3-Dtb) ligand, we have created an RNA tagging system that simplifies the purification and subsequent characterization of endogenous RNPs. Mango-tagged RNP complexes can be immobilized on a streptavidin solid support and recovered in their native state by the addition of free biotin. Furthermore, Mango-based RNP purification can be adapted to different scales of RNP isolation ranging from pull-down assays to the isolation of large amounts of biochemically defined cellular RNPs...
July 26, 2017: RNA
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