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Wyszukujesz frazę "RNA virus" wg kryterium: Temat


Wyświetlanie 1-13 z 13
Tytuł:
Antiviral Activities of Zn2+ Ions for Viral Prevention, Replication, Capsid Protein in Intracellular Proliferation of Viruses
Autorzy:
Ishida, Tsuneo
Powiązania:
https://bibliotekanauki.pl/articles/1177895.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Capsid protein
DNA/RNA virus
HIV
RNA degradation
ROS
Replication
Zinc finger
Opis:
In zinc homeostasis, zinc transporters ZIP and ZnT show tissue specificity and developmental and stimulus responsive expression patterns. The course of the life cycles of viral infections is governed by complex interactions between the virus and the host cellular system. Viruses depend on a host cell for their protein synthesis that the virus must first bind to the host cell, and then the virus enters in the cytoplasm which the genome is liberated from the protective capsid and, either in the nucleus or in the cytoplasm. The use of cellular zinc metalloproteases is effective for virus entry and coronavirus fusion. Molecular aspects of dengue virus genome uncoating and the fate of the capsid protein and RNA genome early during infection were investigated and found that capsid is degraded after viral internalization by the host ubiquitin-proteasome system. These results provide the first insights for antiviral intervention into dengue virus uncoating by Zn-binding degradation and enzyme inhibition of nucleocapsid, capsid protein, viral genome. AZPs inhibit virus DNA replication. Increasing the intracellular Zn2+ concentration with zinc-ionophores like pyrithione can efficiently impair the replication of a variety of RNA viruses, including poliovirus and influenza virus. ZAP is a host antiviral factor that specifically inhibit the replication of certain viruses, including HIV-1, Sindbis virus, and Ebola virus. ZAP specifically binds to the viral mRNA and recruits the cellular RNA degradation machinery to degrade the target RNA, while molecular mechanism by which ZAP inhibits target RNA expression and regulation of antiviral activity have been remained unclear. ROS as byproducts play an important role in cell signaling and regulate hormone action, growth factors, cytokines, transcription, apoptosis, iron transport, immunomodulation, and neuromodulation which many retroviruses, DNA and RNA viruses can cause cell death by generating oxidative stress in infected cells.
Źródło:
World Scientific News; 2018, 97; 28-50
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low recombination activity of R region located at both ends of the HIV-1 genome
Autorzy:
Urbanowicz, Anna
Kurzyńska-Kokorniak, Anna
Jankowska, Anna
Alejska, Magdalena
Figlerowicz, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1039669.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
copy-choice mechanism
template switching
homologous RNA recombination
strand transfer
R region
RNA virus
retrovirus
Opis:
Although two strand transfer events are indispensable for the synthesis of double-stranded DNA and establishing HIV-1 infection, the molecular basis of these phenomena is still unclear. The first obligatory template switching event occurs just at the beginning of the virus replication cycle and involves two copies of the 97-nucleotide long R region, located one each at the both ends of the HIV-1 genome (HIV-1 R). Thus, one can expect that the molecular mechanism of this process is similar to the mechanism of homologous recombination which operates in RNA viruses. To verify the above-mentioned hypothesis, we attempted to assess the recombination activity of HIV-1 R. To this end, we tested in vitro, how effectively it induces template switching by HIV-1 RT in comparison with another well-characterized sequence supporting frequent homologous crossovers in an unrelated virus (R region derived from Brome mosaic virus - BMV R). We also examined if the RNA sequences neighboring HIV-1 R influence its recombination activity. Finally, we tested if HIV-1 R could cause BMV polymerase complex to switch between RNA templates in vivo. Overall, our results have revealed a relatively low recombination activity of HIV-1 R as compared to BMV R. This observation suggests that different factors modulate the efficiency of the first obligatory strand transfer in HIV-1 and the homology-driven recombination in RNA viruses.
Źródło:
Acta Biochimica Polonica; 2012, 59, 4; 619-626
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An overview of Human Papilloma Virus
Autorzy:
Amarakoon, A. A. D. Gayathri Upeksha
Daulagala, S. W. P. L.
Fathima, Fara
Powiązania:
https://bibliotekanauki.pl/articles/1182889.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Papilloma virus; cervical cancer; RNA genome; control region
Opis:
Cervical cancer is the second commonest cause of cancer among women. According to the World Health Organization (WHO) data, in 2006 there were 1.4 million women who were suffering from cervical cancer and 80% of deaths among them were of women from developing countries. Genital infection with Human Papilloma Virus (HPV) is one of the major etiological factors for developing cervical cancers in almost all countries (World Health Organization, 2005). Papilloma viruses were first identified, cloned and sequenced from cervical tumor specimens and were subsequently established as important causative agents for the development of cervical cancer. Differences in prevalence rates are observed worldwide. Infection is more common in sexually active young women of 18-30 years and a reduction in acquisition of infection is observed after 30 years. The situation of Cervical cancer in Sri Lanka is identified as the second most common cancer among women in Sri Lanka and approximately 7.74 million women are included in the risk category. It is reported that nearly 850 die from cervical cancer each year.
Źródło:
World Scientific News; 2016, 53, 3; 275-308
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antiviral Activities of Cu2+ Ions in Viral Prevention, Replication, RNA Degradation, and for Antiviral Efficacies of Lytic Virus, ROS-Mediated Virus, Copper Chelation
Autorzy:
Ishida, Tsuneo
Powiązania:
https://bibliotekanauki.pl/articles/1177808.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Capsid protein
Copper chelation
Copper homeostasis
Copper oxide nanoparticles
Cu2+ and Cu1+ ions
DNA/RNA virus
HSV
ROS
Viral replication
mRNA degradation or decay
Opis:
Copper has been known for decades that marked changes of micronutrient homeostasis in the host are accompanied by infection or inflammation. Copper levels in the serum are significantly elevated in response to inflammation that copper accumulates at sites of inflammation. Easily oxidized copper oxide nanoparticles (CuONPs) are widely used as catalysts that the ability of CuONPs to reduce bacterial population and virus application is enhanced. The mechanism of copper-mediated inactivation of herpes simplex virus (HSV) is by which cupric ions oxidatively damage biomolecules. Virus-mediated subjugation and modulation of host lipids during infection that the life cycle of most viruses proceeds through a series of basic steps: binding and internalization, fusion, uncoating, of the viral genome, its replication, assembly of new particles, and budding or release of the newly made viruses. The HIV-1 protein Vpu is an 81-amino-acid (16-kDa) type I which the presence of Vpu leads to the degradation of BST-2 via an endosome-lysosome degradation pathway. Oxidative degradation by a Cu-metalloenzyme, and ubiquitin-mediated degradation of cellular proteins were exploited. Copper can disrupt the lytic cycle of the Coccolithovirus. Lysins represent a novel class of anti-infectives derived from bacteriophage which lysins are bacterial cell wall hydrolytic enzymes that selectively and rapidly kill specific bacteria. Regarding copper induced cellular toxicity, several mechanisms have been proposed based on the formations of ROS by free Cu ions as cupric and cuprous ions can participate in redox reactions. ROS (O2ˉ,・OH, OHˉ), Cu+ and H2O2 play the important roles for viral inactivations. Thujaplicin-copper chelates inhibit influenza virus-induced apoptosis. Pyrrolidine dithiocarbamate as a metal ion binding agent inhibits the activity of the viral proteases of polyprotein processing and RNA replication of HRV. Chelation enables metals are capable of ligand scavenging via complexation, since reverse transcriptase enzyme inhibits the growth and replication of RNA tumor viruses. Thus, copper complex and copper chelation enhance antiviral efficacy.
Źródło:
World Scientific News; 2018, 99; 148-168
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ribozymes of the hepatitis delta virus: Recent findings on their structure, mechanism of catalysis and possible applications.
Autorzy:
Ciesiołka, Jerzy
Wrzesinski, Jan
Łęgiewicz, Michał
Smólska, Barbara
Dutkiewicz, Mariola
Powiązania:
https://bibliotekanauki.pl/articles/1044131.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
RNA structure
RNA catalysis
HDV
hepatitis delta virus
ribozyme
Opis:
Although the delta ribozymes have been studied for more than ten years the most important information concerning their structure and mechanism of catalysis were only obtained very recently. The crystal structure of the genomic delta ribozyme turns out to be an excellent example of the extraordinary properties of RNA molecules to fold into uniquely compact structures. Details of the X-ray structure have greatly stimulated further studies on the folding of the ribozymes into functionally active molecules as well as on the mechanism of RNA catalysis. The ability of the delta ribozymes to carry out general acid-base catalysis by nucleotide side chains has been assumed in two proposed mechanisms of self-cleavage. Recently, considerable progress has been also made in characterizing the catalytic properties of trans-acting ribozyme variants that are potentially attractive tools in the strategy of directed RNA degradation.
Źródło:
Acta Biochimica Polonica; 2001, 48, 2; 409-418
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complete nucleotide sequence of a Polish strain of Peanut stunt virus (PSV-P) that is related to but not a typical member of subgroup I
Autorzy:
Obrepalska-Steplowska, Aleksandra
Budziszewska, Marta
Pospieszny, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/1040679.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Peanut stunt virus
satellite RNA
sequence analysis
Opis:
Peanut stunt virus (PSV) is a common legume pathogen present worldwide. It is also infectious for many other plants including peanut and some vegetables. Viruses of this species are classified at present into three subgroups based on their serology and nucleotide homology. Some of them may also carry an additional subviral element - satellite RNA. Analysis of the full genome sequence of a Polish strain - PSV-P - associated with satRNA was performed and showed that it may be classified as a derivative of the subgroup I sharing 83.9-87.9% nucleotide homology with other members of this subgroup. A comparative study of sequenced PSV strains indicates that PSV-P shows the highest identity level with PSV-ER or PSV-J depending on the region used for analysis. Phylogenetic analyses, on the other hand, have revealed that PSV-P is related to representatives of the subgroup I to the same degree, with the exception of the coat protein coding sequence where PSV-P is clustered together with PSV-ER.
Źródło:
Acta Biochimica Polonica; 2008, 55, 4; 731-739
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two types of non-homologous RNA recombination in brome mosaic virus
Autorzy:
Alejska, Magdalena
Malinowska, Nelli
Urbanowicz, Anna
Figlerowicz, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1041326.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
non-homologous RNA recombination
site-specific RNA recombination
heteroduplex-mediated RNA recombination
brome mosaic virus
Opis:
Non-homologous RNA recombination is a process enabling the exchange of genetic material between various (related or unrelated) RNA-based viruses. Despite extensive investigations its molecular mechanism remains unclear. Studies on genetic recombination in brome mosaic virus (BMV) have shown that local hybridization between genomic RNAs induces frequent non-homologous crossovers. A detailed analysis of recombinant structures suggested that local complementary regions might be involved in two types of non-homologous recombination in BMV: site-specific and heteroduplex-mediated. To verify the above hypothesis and better recognize the mechanism of the phenomenon studied we have tested how the putative types of recombination are affected by a specific mutation in the BMV polymerase gene or by changes in RNA structure. The experiments undertaken revealed substantial differences between site-specific and heteroduplex-mediated recombination, indicating that they occur according to different mechanisms. The former can be classified as homology-assisted, and the latter as homology-independent. In addition to local RNA/RNA hybridization, short regions of homology are required for site-specific crossovers to occur. They are most efficiently mediated if one homologous sequence is located at the beginning of and the second just before a double-stranded region. At present it is difficult to state what is the mechanism of heteroduplex-mediated recombination. Earlier it was postulated that strong RNA/RNA interaction enforces template switching by the viral replicase. There are, however, several observations questioning this model and indicating that some other factors, which are still unknown, may influence heteroduplex-mediated crossovers.
Źródło:
Acta Biochimica Polonica; 2005, 52, 4; 833-844
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative analysis of Yellow Head Virus (YHD) diagnostic methods adopted in Sri Lanka to investigate the accuracy and specificity of the virus
Autorzy:
Amarakoon, A. A. D. Gayathri U.
Wijegoonawardane, P. K. M.
Powiązania:
https://bibliotekanauki.pl/articles/1182758.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aquaculture
OIE
Penaeus monodon
RNA
Yellow head virus
Opis:
Yellow head virus is a common viral pathogen which infects cultured Penaeus monodon world-wide, resulting in immature larvae and the growth retardation. Therefore, several detection methods are recommended by the Office des Epizootics (OIE) for use in Asia including Sri Lanka. This study was attempted to evaluate the RT-PCR diagnostic method is the appropriate and accurate YHV detection method which is recommended by the OIE comparing with histological identification and haemolymph Smear method. A total of 150 individuals of Penaeus monodon, post larve samples obtained from different shrimp hatcheries located in Northwestern province were screened for the presence of YHV and the results were comparatively analyzed with three different protocols, namely wet mount observation, histopathological observation and RT- PCR detection. Highest prevalence was recorded with wet mount observations (78%) and the lowest was recorded using histopathology (22%). Comparison of PCR tests generated consisted of positive samples 31/51 (2010), 38/65(2011) and 18/34 (2012) respectively. The results obtained with the IQ2000 commercial kit, were the most reliable and it indicated 56.6% average prevalence of YHV.
Źródło:
World Scientific News; 2017, 66; 181-192
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of Narcissus latent virus isolates using one-step RT-PCR assay
Autorzy:
Berniak, H.
Komorowska, B.
Sochacki, D.
Powiązania:
https://bibliotekanauki.pl/articles/1948.pdf
Data publikacji:
2013
Wydawca:
Instytut Ogrodnictwa
Tematy:
narcissus latent virus
virus identification
reverse transcription polymerase chain reaction
DAS-ELISA method
RNA sequence
cucumber mosaic virus
polyclonal antibody
Źródło:
Journal of Horticultural Research; 2013, 21, 1
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First record of Tomato black ring virus [TBRV] in the natural infection of Cucumis sativus in Poland
Autorzy:
Pospieszny, H
Jonczyk, M.
Borodynko, N.
Powiązania:
https://bibliotekanauki.pl/articles/65241.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
serology
infection
natural infection
Polska
satellite RNA
tomato black ring virus
cucumber
Cucumis sativus
Źródło:
Journal of Plant Protection Research; 2003, 43, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of RNA1 and RNA2 of Soil-borne wheat mosaic virus in winter wheat grown from infected seeds
Autorzy:
Jezewska, M.
Trzmiel, K.
Zarzynska-Nowak, A.
Powiązania:
https://bibliotekanauki.pl/articles/66358.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
epidemiology
detection
RNA
soil-borne wheat mosaic virus
winter wheat
wheat
infected seed
seed infection
Opis:
A Polish isolate of Soil-borne wheat mosaic virus (SBWMV-Pol1) was characterized by limited pathogenicity and a low concentration of virus particles in infected plant tissues. The aim of this research was to consider the possibility of seed-transmission dissemination of the virus. Seeds of winter wheat cv. Muszelka served as material for the studies. Two methods were involved in the diagnostics of seedlings grown from potentially infected seeds: enzyme-linked immunosorbent assay (ELISA), as the screening assay and immuno-capture-reverse transcription-polymerase chain reaction (IC-RT-PCR) for molecular confirmation of the infection. RNA1 and RNA2 of SBWMV-Pol1 were detected in 6 out of 1,410 plants submitted to diagnostic procedures. The possibility of seed transmission of SBWMV-Pol1 was discussed.
Źródło:
Journal of Plant Protection Research; 2016, 56, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural analyses of AC4 protein of Sri Lankan cassava mosaic virus
Autorzy:
Gupta, S.
Ganguli, S.
Basu, P.
Datta, A.
Powiązania:
https://bibliotekanauki.pl/articles/11568.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
structural analysis
AC4 protein
cassava mosaic virus
RNA silencing
viral infection
viral suppressor
geminivirus
post transcriptional gene silencing
Opis:
RNA silencing is one of the important phenomenon in plant defense mechanism, it actively protect host plants against viral infections. Existing viruses must have developed counter defense strategies to survive this arms race. Such counter defense strategy is the viral silencing suppressor (VSRs) which have been reported to directly interfere with the various steps leading to the interference of viral RNAs. Most identified VSRs are multifunctional, besides being RNA-silencing suppressors, they often perform essential roles by functioning as coat proteins, helper components for viral transmission, replicases and movement proteins, proteases or transcriptional regulators. One such identified VSR is AC4 of Sri Lankan cassava mosaic virus strain. Trivial knowledge about the structure –function relationship of this VSR leads to this work, where we focus on the structure generation by modelling to identify the mode of interactions with the various effector molecules of the silencing pathways. Structural analyses have been performed to screen interacting residues. Results indicate conserved structural features which signify propensity of functional interactions and further shows that this VSR can be a potent tool for the analysis of RNA silencing mechanisms and the relationships between different silencing pathways and VSRs.
Źródło:
International Letters of Natural Sciences; 2015, 06
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the occurrence of tick-borne encephalitis virus RNA in European bison (Bison bonasus) eliminated at Bialowieza Primeval Forest (north-eastern Poland) in 2005-2009
Autorzy:
Biernat, B.
Karbowiak, G.
Powiązania:
https://bibliotekanauki.pl/articles/6437.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
tick-borne encephalitis virus
Flaviviridae
RNA
occurrence
European bison
Bison bonasus
central nervous system
animal disease
tick-borne encephalitis
Bialowieza Forest
Polska
2005-2009 period
Opis:
Tick-borne encephalitis virus (TBEV) (Flaviviridae, Flavivirus) is an arthropod-borne virus, an etiologic agent of tick-borne encephalitis (TBE), an infection involving the central nervous system. The disease is endemic in a large region in Eurasia where it is transmitted mainly by Ixodes ricinus in Europe and I. persulcatus ticks in Asia. This is the most important tick-transmitted arbovirus of human pathogenicity in Europe. The Białowieża Primeval Forest is a well-known endemic focus of tick-borne encephalitis. The aim of this study was to identify the prevalence of tickborne encephalitis virus (TBEV) in European bison, the important hosts of ticks in the Białowieża Primeval Forest. In the years 2005–2009, 95 blood samples were collected from European bison and examined for the presence of TBEV using nRT-PCR method. No positive results were obtained. For better understanding of TBEV vertebrate reservoir hosts in Poland, further investigations are needed.
Źródło:
Annals of Parasitology; 2014, 60, 2
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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