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Wyświetlanie 16-30 z 34
Tytuł:
Co-inoculation with two non-infectious cDNA copies of potato spindle tuber viroid (PSTVd) leads to the appearance of novel fully infectious variants.
Autorzy:
Podstolski, Wojciech
Góra-Sochacka, Anna
Zagórski, Włodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/1041466.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
non-coding RNA
viroid
circular RNA
PSTVd
recombination
Opis:
Potato spindle tuber viroid (PSTVd) is one of the smallest (about 360 nt) infectious plant agents. It is composed of a single-stranded circular non-coding RNA molecule. In the course of previous passage experiments with two intermediate PSTVd variants I2 and I4, three non-infectious clones (I2-50, I4-37 and I4 VI-17) were found. When inoculated separately as cDNAs on tomato "Rutgers" test plants these variants did not induce any visible disease symptoms and did not produce progeny. The presence of such non-infectious variants raises several questions about their origin and biology and to answer them, mixed co-infections with cDNA copies of two non-infectious variants (I2-50, I4-37) were performed. PSTVd infection was observed in seven out of 30 inoculated plants. The progeny isolated from three separate plants contained novel variants, together with the parental I2 and I4 sequences. It is conceivable that the appearance of repaired PSTVd molecules, clearly capable of cell-to-cell movement leading to the systemic infection, results from recombination events. An analysis of the recombinant molecules and comparison with databases identified the specific sites responsible for the restricted infectivity of the I2-50 and I4-37 PSTVd variants. In parallel experiments in which (+) strand PSTVd infectious transcripts were used, no recombinants were observed, and the original I2-50 and I4-37 non-infectious sequences were not detected in the progeny.
Źródło:
Acta Biochimica Polonica; 2005, 52, 1; 87-98
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic variability of potato spindle tuber viroid RNA replicon.
Autorzy:
Góra-Sochacka, Anna
Candresse, Thierry
Zagórski, Włodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/1044141.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
genetic stability
sequence diversity
infectious clones
pathogenicity
potato spindle tuber viroid
Opis:
The genetic continuity of the potato spindle tuber viroid (PSTVd) genome was analysed after infection of tomato plants with cloned cDNAs of parental strains. During the six weeks of the experiment, several new sequence variants appeared. The sequence variants detected in the progeny population induced sequence-specific disease symptoms. The PSTVd genome therefore follows the pattern expected for typical pseudo-strains propagating in plants as a population of similar sequences. Assessing further the replicon continuity, a PSTVd cDNA mutant with a deletion in the central conserved region was constructed and proven to be non-infectious. Surprisingly, in a sub-population of potato transformants expressing the same deleted PSTVd RNA an infectious viroid was detected. This suggests specific transcript conversion followed by recovery of the full-length pathogen genome.
Źródło:
Acta Biochimica Polonica; 2001, 48, 2; 467-476
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kolejny wielki genom poznany przy udziale polskich laboratoriów: genom ziemniaka zsekwencjonowany
Next eukaryotic genome revealed with cooperation of the Polish laboratories. Potato genome sequenced
Autorzy:
Gromadka, Robert
Gawor, Jan
Szczęsny, Paweł
Zagórski, Włodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/1195370.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Opis:
W połowie lipca 2011, w Nature ukazał się artykuł "Sekwencja genomu ziemniaka i jej analiza" autorstwa Konsorcjum Sekwencjonowania Genomu Ziemniaka (PGSC). W skład tego Konsorcjum wchodziły 32 zespoły z 14 krajów - znaczących producentów ziemniaków. Współautorami ze strony polskiej, tej wielo autorskiej pracy (94 badaczy, 25 zespołów wiodących) byli członkowie zespołu z Instytutu Biochemii i Biofizyki PAN. Prace Konsorcjum, rozpoczęte w 2007 roku, wspierane były przez rządy państw uczestniczących w programie, w tym Polskiego Ministerstwa Nauki i Szkolnictwa Wyższego, (projekt 47/PGS/2006/01). To trzeci wielki genom (po S. cerevisiae i P. caudatum) w którego poznaniu uczestniczyli pracownicy IBB PAN. Konsorcjum zsekwencjonowało dwa szczepy ziemniaka DM1-3 516 R44 and RH 89-039-16. Szczep DM zsekwencjonowano metodą "shotgun" wykorzystując m. in. platformę sekwencjonowań genomowych IBB PAN (sekwenator Roche GS FLX Titanium 454). Metodami ab initio określono zasób genów kodowanych przez otrzymane sekwencje. Wyniki zweryfikowano analizami transkryptomu objawiającego się w różnych tkankach, czy stadiach rozwojowych oraz w wyniku kontrolowanego stresu. Sumarycznie zidentyfikowano w otrzymanej sekwencji 39031 genów kodujących białka. 25,3% tych genów koduje transkrypty mogące podlegać alternatywnemu składaniu, a więc kontrolujące średnio 2-3 odmienne białka. Wydaje się więc, że w genomie ziemniaka zakodowana jest informacja na temat syntezy ok. 100,000 różnych białek. Porównanie sekwencji DM and RH dowodzi, że ziemniak to roślina wysoce heterozygotyczna. Mutacje punktowe (SNP) występują średnio co 40 nukleotydów, a insercje lub delecje co 394 pary zasad. Wskazuje to wyraźnie, że genom ziemniaka jest niestabilny, co zapewne znajduje swoje odbicie w łatwej degeneracji odmian uprawnych.
In mid-July 2011 Nature published the paper "Genome sequence and analysis of the tuber crop potato" by the Potato Genome Sequencing Consortium - PGSC. This international consortium consisted of 32 teams from 14 countries that are significant potato producers are active in potato breeding programs. The Polish team, representing the PAS Institute of Biochemistry and Biophysics, co-authored the paper, which was signed by 94 consortium members from 25 leading institutions. The work, begun in 2007, was funded by the participating countries' governments - including Poland's Ministry of Science and Higher Education - within the 47/PGS/2006/01. After the yeast and paramecium genomes this is the third large genome sequencing in which IBB teams have participated. Consortium sequenced two strains of potato DM1-3 516 R44 and RH 89-039-16. The DM strain was sequenced by the consortium using the "Shotgun method" on genome sequencing platforms, one of which was created in Warsaw (Roche GS FLX Titanium 454 sequencer).The second strain sequenced was a laboratory S. tuberosum heterodiploid RH 89-039-16. Ab initio predictions of genes and their functions were verified by RNA transcriptome analysis done for various tissues, development stages and under stress. This allowed for the identification of 39031 gene-coding proteins. 25,3% of these genes produce RNA that undergoes splicing, coding for an average of 2-3 different proteins. It therefore seems that the potato genome codes for approximately 100 000 different proteins. Comparisons of the DM and RH sequences show that the potato exhibits high heterozygosity. Single-nucleotiste polymorphisms (SNP) are encountered on average every 40 nucleotides, while insertions or deletions (so-called indel) of an average length of 12.8 nucleotides are encountered on average every 394 base pairs. This data clearly shows that gene damage in the potato genome is a frequent occurrence, which accounts for the easy degeneration of industrial strains.
Źródło:
Kosmos; 2011, 60, 3-4; 491-497
0023-4249
Pojawia się w:
Kosmos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of potyvirus terminal protein VPg-transgenic Arabidopsis thaliana plants
Autorzy:
Wojtal, Izabela
Piontek, Paulina
Grzela, Renata
Jarmołowski, Artur
Zagórski, Włodzimierz
Chroboczek, Jadwiga
Powiązania:
https://bibliotekanauki.pl/articles/1039885.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
VPg protein
Potyvirus
pathogen-derived resistance
transgenic plant
Opis:
Virus-coded VPg protein of Potato virus Y (PVY) does not have homologs apart from other VPgs. Since VPg is indispensable for the potyvirus life cycle, it appeared a good candidate for eliciting pathogen-derived resistance to PVY. Following agroinfection used to obtain PVY VPg-transgenic Arabidopsis thaliana plants, only few transgenic seeds were recovered giving rise to six transgenic plants that contained the VPg gene with the correct sequence. They generated VPg mRNA, but VPg protein was not detected. Some plants were immune to PVY infection suggesting post-transcriptional gene silencing. However, the likely PVY VPg toxicity exerted at an early stage of transformed seeds development precludes its use for engineering pathogen-derived resistance.
Źródło:
Acta Biochimica Polonica; 2011, 58, 3; 349-353
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nucleotide sequence of RNA of a Polish isolate of potato leafroll luteovirus
Autorzy:
Pałucha, Andrzej
Sadowy, Ewa
Kujawa, Alicja
Juszczuk, Marek
Zagórski, Włodzimierz
Hulanicka, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/1045304.pdf
Data publikacji:
1994
Wydawca:
Polskie Towarzystwo Biochemiczne
Źródło:
Acta Biochimica Polonica; 1994, 41, 4; 405-414
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Engineered resistance against proteinases
Autorzy:
Milner, Malgorzata
Chroboczek, Jadwiga
Zagorski-Ostoja, Wlodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/1040935.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
fusion proteins
proteinase inhibitors
protein protection
Opis:
Exogenous proteinase inhibitors are valuable and economically interesting protective biotechnological tools. We examined whether small proteinase inhibitors when fused to a selected target protein can protect the target from proteolytic degradation without simultaneously affecting the function and activity of the target domain. Two proteinase inhibitors were studied: a Kazal-type silk proteinase inhibitor (SPI2) from Galleria mellonella, and the Cucurbita maxima trypsin inhibitor I (CMTI I). Both inhibitors target serine proteinases, are small proteins with a compact structure stabilized by a network of disulfide bridges, and are expressed as free polypeptides in their natural surroundings. Four constructs were prepared: the gene for either of the inhibitors was ligated to the 5' end of the DNA encoding one or the other of two selected target proteins, the coat protein (CP) of Potato potyvirus Y or the Escherichia coli β-glucuronidase (GUS). CMTI I fused to the target proteins strongly hampered their functions. Moreover, the inhibitory activity of CMTI I was retained only when it was fused to the CP. In contrast, when fused to SPI2, specific features and functions of both target proteins were retained and the inhibitory activity of SPI2 was fully preserved. Measuring proteolysis in the presence or absence of either inhibitor, we demonstrated that proteinase inhibitors can protect target proteins used either free or as a fusion domain. Interestingly, their inhibitory efficiency was superior to that of a commercial inhibitor of serine proteinases, AEBSF.
Źródło:
Acta Biochimica Polonica; 2007, 54, 3; 523-536
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mapping of the influenza A hemagglutinin serotypes evolution by the ISSCOR method
Autorzy:
Radomski, Jan
Słonimski, Piotr
Zagórski-Ostoja, Włodzimierz
Borowicz, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1039244.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
ISSCOR descriptors
phylogenetic analysis
influenza virus
hemagglutinin
phylogenetic maps
Opis:
Analyses and visualizations by the ISSCOR method of influenza virus hemagglutinin genes of different A-subtypes revealed some rather striking temporal relationships between groups of individual gene subsets. Based on these findings we consider application of the ISSCOR-PCA method for analyses of large sets of homologous genes to be a worthwhile addition to a toolbox of genomics - allowing for a rapid diagnostics of trends, and ultimately even aiding an early warning of newly emerging epidemiological threats.
Źródło:
Acta Biochimica Polonica; 2014, 61, 3; 441-451
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Virus-like particles of potato leafroll virus as potential carrier system for nucleic acids.
Autorzy:
Sułuja, Elżbieta
Strokowskaja, Ludmiła
Zagórski-Ostoja, Włodzimierz
Pałucha, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1041380.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
encapsidation
Virus-like particles
Opis:
Potato leafroll virus is a member of the polerovirus genus. The isometric virion is formed by a coat protein encapsidating single-stranded, positive-sense, mono-partite genomic RNA with covalently attached viral protein at the 5' end. The coat protein of the virus exists in two forms: i) a 23 kDa protein, the product of the coat protein gene, and ii) a 78 kDa protein, the product of the coat protein gene and an additional open reading frame expressed by read-through of the coat protein gene stop codon. The aim of this work was the expression of potato leafroll virus coat protein-based proteins that would be able to assemble into virus-like particles in insect cells. These modified particles were tested for their ability to encapsidate nucleic acids. Two types of N-terminally His-tagged coat protein constructs were used for the expression in insect cells: one, encoding a 23 kDa protein with the C-terminal amino-acid sequence corresponding to the wild type coat protein and the second with additional clathrin binding domain at the C-terminus. The expression of these two proteins by a recombinant baculovirus was characterized by Western immunoblotting with antibodies directed against potato leafroll virus. The protection or putative encapsidation of nucleic acids by these two coat protein derivatives was shown by DNase I and RNase A protection assays.
Źródło:
Acta Biochimica Polonica; 2005, 52, 3; 699-702
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elements regulating Potato leafroll virus sgRNA1 translation are located within the coding sequences of the coat protein and read-through domain
Autorzy:
Łoniewska-Lwowska, Adrianna
Chełstowska, Sylwia
Zagórski-Ostoja, Włodzimierz
Pałucha, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1040473.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
polerovirus
subgenomic RNA
in vitro translation
Opis:
Translation of viral proteins from subgenomic RNAs (sgRNAs) is a common strategy among positive-stranded RNA viruses. Unlike host mRNA, sgRNA of Potato leafroll virus (PLRV) does not possess a cap at its 5' end nor a poly(A) tail at the 3' terminus, both of which are known to be crucial for translation of RNA in eukaryotic cells. Here, we demonstrate, that in wheat germ extract (WGE) truncation of the sgRNA1 5' UTR increases translation efficiency, as it has previously been observed in rabbit reticulocyte lysate (RRL), whereas removal of the 3' UTR does not affect translation. We also describe two regulatory elements located within the coding sequence of the coat protein (CP) gene and its read-through domain (RTD) and are responsible for regulation of in vitro translation of the PLRV sgRNA1. The first element is composed of the purine sequence AAAGGAAA located between the AUG codons of the CP and 17K genes. Deletion of this domain or its substitution by pyrimidines reduced by half the translation of both genes, whereas deletion of the RTD resulted in a 3.6-fold reduction in translation efficiency. This is the first report of translation regulatory elements of plant viruses located within a coding region.
Źródło:
Acta Biochimica Polonica; 2009, 56, 4; 619-625
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antibody response to DNA vaccine against H5N1 avian influenza virus in broilers immunized according to three schedules
Autorzy:
Stachyra, Anna
Góra-Sochacka, Anna
Zagórski-Ostoja, Włodzimierz
Król, Ewelina
Sirko, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1039267.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Avian influenza
H5N1
DNA vaccine
broilers
Opis:
Broiler type chickens were immunized intramuscularly with a DNA vaccine encoding hemagglutinin (HA) from H5N1 avian influenza virus. The chickens were divided into four groups: control group which was not immunized, a group which obtained only one dose, and two groups which were immunized twice, one group with a boost two weeks after the priming and the other four weeks. Blood samples were collected at several time points and the dynamics of the humoral response to the vaccine was studied. High level of anti-HA antibodies was detected only in the last two groups, that is in chickens immunized according to the prime-boost strategy, regardless of the schedule. An additional interesting observation of this study was detection of the cross-reactivity of an anti-H5 HA positive serum with H5N2 and H1N1 viruses, suggesting that the DNA vaccine tested can induce antibodies of a broad specificity.
Źródło:
Acta Biochimica Polonica; 2014, 61, 3; 593-596
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expression of avian influenza haemagglutinin (H5) and chicken interleukin 2 (chIL-2) under control of the ptcB promoter in Lactococcus lactis
Autorzy:
Szatraj, Katarzyna
Szczepankowska, Agnieszka
Sączyńska, Violetta
Florys, Katarzyna
Gromadzka, Beata
Łepek, Krzysztof
Płucienniczak, Grażyna
Szewczyk, Bogusław
Zagórski-Ostoja, Włodzimierz
Bardowski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1039270.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Lactococcus lactis
ptcB promoter
heterologous gene expression
avian influenza H5N1
H5 haemagglutinin
chicken interleukin-2
Opis:
Gram-positive and nonpathogenic lactic acid bacteria (LAB) are considered to be promising candidates for the development of new, safe systems of heterologous protein expression. Recombinant LAB has been shown to induce specific local and systemic immune response against selected pathogens, and could be a good alternative to classical attenuated carriers. The main goal of our study was to express the avian influenza haemagglutinin (H5) and chicken interleukin 2 (chIL-2) in Lactococcus lactis. Results of this study were anticipated to lead to construction of lactococcal strain(s) with potential vaccine properties against the avian influenza A (H5N1) virus. Expression of the cloned H5 gene, its His-tagged variant and chIL-2 gene, under the control of the ptcB gene promoter was attested by RT-PCR on transcriptional level and Western or dot blot analysis on translational level, demonstrating that system can be an attractive solution for production of heterologous proteins. The results of the preliminary animal trial conducted in mice are a promising step toward development of a vaccine against avian bird flu using Lactococcus lactis cells as antigen carriers.
Źródło:
Acta Biochimica Polonica; 2014, 61, 3; 609-614
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 16-30 z 34

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