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    Wyświetlanie 1-4 z 4
    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:
    Arabidopsis thaliana microRNA162 level is posttranscriptionally regulated via splicing and polyadenylation site selection
    Autorzy:
    Barciszewska-Pacak, Maria
    Knop, Katarzyna
    Jarmołowski, Artur
    Szweykowska-Kulińska, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/1038744.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    miRNA
    pri-miRNA
    abiotic stress
    gene expression
    Opis:
    Arabidopsis microRNA162 (miRNA162) level regulation was studied under abiotic stresses, such as drought and salinity. The TaqMan® microRNA assay proved that A. thaliana miRNA162 level was elevated under these stresses, confirming its salt and drought responsiveness. The promoter region analyses of A. thaliana miRNA162a and b genes (MIR162a and MIR162b) identified numerous salinity and drought responsive elements. However, our results indicated that Arabidopsis MIR162a was presumably the main locus responsible for the mature ath-miRNA162 accumulation under the stresses tested, and the MIR162b was generally rather weakly expressed, both in control and under the stress conditions. The MIR162a structure was confirmed to be complex and the pri-miRNA162a hairpin structure was shown to span an alternative exon and an intron. The MIR162a transcription generated a few pri-miRNA162a splicing isoforms that could be functional and non-functional. Upon drought and salinity stresses, the regulation of the pri-miRNA162a alternative splicing pattern revealed an increase of a functional pri-miR162a isoform and a preferential distal polyA site selection under the stress conditions. Apart from the potential transcriptional regulation of the miRNA genes (MIRs) expression, the data obtained point to an essential role of posttranscriptional regulation of Arabidopsis microRNA162 level.
    Źródło:
    Acta Biochimica Polonica; 2016, 63, 4; 811-816
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Abscisic acid does not influence the subcellular distribution of the HYL1 protein from Arabidopsis thaliana
    Autorzy:
    Lesicka-Górecka, Joanna
    Szarzyńska, Bogna
    Sawczak, Marta
    Bagdiul, Ivona
    Górski, Paweł
    Jarmołowski, Artur
    Szweykowska-Kulińska, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/1040709.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    subcellular distribution
    abscisic acid
    Arabidopsis thaliana
    expression profile
    HYL1 protein
    Opis:
    HYL1 is a nuclear protein involved in the processing of miRNAs but its exact function remains unknown. Arabidopsis thaliana hyl1 mutants exhibit hypersensitivity to ABA. We decided to answer the question whether ABA affects the HYL1 protein localization within the cell and show that it does not. We also studied the expression of HYL1 in different tissues and organs. In this paper we show for the first time the expression profile of the HYL1 protein using anti-HYL1 antibodies. The protein is present in seedlings and mature plants in all organs studied, with the highest amount in inflorescences. A. thaliana HYL1 protein has several repetitions of a 28-amino-acid sequence at the C-terminus that confer protein instability. Our bioinformatic analysis of HYL1 homologs in different Brassica species shows that this repetition is typical only for Arabidopsis. This may suggest a relatively late evolutionary acquisition of the C-terminal domain.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 3; 517-524
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cloning and characterization of Arabidopsis thaliana AtNAP57 - a homologue of yeast pseudouridine synthase Cbf5p.
    Autorzy:
    Maceluch, Jarosław
    Kmieciak, Maciej
    Szweykowska-Kulińska, Zofia
    Jarmołowski, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1043736.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Cbf5p
    dyskerin
    H/ACA snoRNAs
    Y
    pseudouridine synthase
    NAP57
    Opis:
    Rat Nap57 and its yeast homologue Cbf5p are pseudouridine synthases involved in rRNA biogenesis, localized in the nucleolus. These proteins, together with H/ACA class of snoRNAs compose snoRNP particles, in which snoRNA guides the synthase to direct site-specific pseudouridylation of rRNA. In this paper we present an Arabidopsis thaliana protein that is highly homologous to Cbf5p (72% identity and 85% homology) and NAP57 (67% identity and 81% homology). Moreover, the plant protein has conserved structural motifs that are characteristic features of pseudouridine synthases of the TruB class. We have named the cloned and characterized protein AtNAP57 (A rabidopsis t haliana homologue of NAP57 ). AtNAP57 is a 565 amino-acid protein and its calculated molecular mass is 63 kDa. The protein is encoded by a single copy gene located on chromosome 3 of the A. thaliana genome. Interestingly, the AtNAP57 gene does not contain any introns. Mutations in the human DKC1 gene encoding dyskerin (human homologue of yeast Cbf5p and rat NAP57) cause dyskeratosis congenita a rare inherited bone marrow failure syndrome characterized by abnormal skin pigmentation, nail dystrophy and mucosal leukoplakia.
    Źródło:
    Acta Biochimica Polonica; 2002, 49, 3; 699-709
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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