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Novel Ribonuclease Activity Differs between Fibrillarins from Arabidopsis thaliana.

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Logáil Isteach / Cláraigh

Fibrillarin is one of the most important nucleolar proteins that have been shown as essential for life. Fibrillarin localizes primarily at the periphery between fibrillar center and dense fibrillar component as well as in Cajal bodies. In most plants there are at least two different genes for

Identification and Properties of the Major Ribonucleases of Arabidopsis thaliana.

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Logáil Isteach / Cláraigh

The profile of major ribonuclease (RNase) activities of Arabidopsis thaliana has been identified and characterized using a substrate-based gel assay. Following sodium dodecyl sulfatepolyacrylamide gel electrophoresis, as many as 16 RNases, varying in size from 9 to 41 kilodaltons can be detected.

Localization of RNS2 ribonuclease to the vacuole is required for its role in cellular homeostasis.

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Logáil Isteach / Cláraigh

UNASSIGNED Localization of the RNase RNS2 to the vacuole via a C-terminal targeting signal is essential for its function in rRNA degradation and homeostasis. RNase T2 ribonucleases are highly conserved enzymes present in the genomes of nearly all eukaryotes and many microorganisms. Their

Structural and functional characteristics of S-like ribonucleases from carnivorous plants.

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Logáil Isteach / Cláraigh

Although the S-like ribonucleases (RNases) share sequence homology with the S-RNases involved in the self-incompatibility mechanism in plants, they are not associated with this mechanism. They usually function in stress responses in non-carnivorous plants and in carnivory in carnivorous plants. In

Mechanistic Studies Reveal Similar Catalytic Strategies for Phosphodiester Bond Hydrolysis by Protein-only and RNA-dependent Ribonuclease P.

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Logáil Isteach / Cláraigh

Ribonuclease P (RNase P) is an endonuclease that catalyzes the essential removal of the 5' end of tRNA precursors. Until recently, all identified RNase P enzymes were a ribonucleoprotein with a conserved catalytic RNA component. However, the discovery of protein-only RNase P (PRORP) shifted this

Molecular cloning of cDNAs encoding ribonuclease-related proteins in Nicotiana glutinosa leaves, as induced in response to wounding or to TMV-infection.

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Logáil Isteach / Cláraigh

We earlier isolated a cDNA clone (NGR1) encoding a wound-inducible ribonuclease (RNase NW) from leaves of Nicotiana glutinosa [Kariu et al. Biosci. Biotechnol. Biochem., 62, 1144-1151 (1998)]. In this study, two distinct cDNA clones, NGR2 and NGR3, encoding proteins with a ribonuclease-related

Spinach CSP41, an mRNA-binding protein and ribonuclease, is homologous to nucleotide-sugar epimerases and hydroxysteroid dehydrogenases.

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Logáil Isteach / Cláraigh

Spinach CSP41 is part of a protein complex that binds to the 3' untranslated region (UTR) of petD precursor-mRNA, a chloroplast gene encoding subunit IV of the cytochrome b6/f complex. CSP41 cleaves the 3'-UTR of petD mRNA within the stem-loop structure, suggesting a key role in the control of

TOR mediates the autophagy response to altered nucleotide homeostasis in a ribonuclease mutant

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Logáil Isteach / Cláraigh

The Arabidopsis thaliana T2 family endoribonuclease RNS2 localizes to the vacuole and functions in rRNA degradation. Loss of RNS2 activity impairs rRNA turnover and leads to constitutive autophagy, a process for degradation of cellular components. Autophagy is normally activated during environmental

Molecular characterization of the AP19 gene family in Arabidopsis thaliana: components of the Golgi AP-1 clathrin assembly protein complex.

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Logáil Isteach / Cláraigh

AP19 is the smallest polypeptide component of AP-1, the clathrin associated protein complex found in clathrin-coated vesicles of the Golgi apparatus. Two genomic clones that encode homologues of AP19 were isolated from Arabidopsis thaliana (AAP19-1 and AAP19-2). Analysis of their nucleotide

Structural determinants of Arabidopsis thaliana Hyponastic leaves 1 function in vivo.

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Logáil Isteach / Cláraigh

MicroRNAs have turned out to be important regulators of gene expression. These molecules originate from longer transcripts that are processed by ribonuclease III (RNAse III) enzymes. Dicer proteins are essential RNAse III enzymes that are involved in the generation of microRNAs (miRNAs) and other

Oxygen control of ethylene biosynthesis during seed development in Arabidopsis thaliana (L.) Heynh.

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Logáil Isteach / Cláraigh

An unforeseen side-effect on plant growth in reduced oxygen is the loss of seed production at concentrations around 25% atmospheric (50 mmol mol-1 O2). In this study, the model plant Arabidopsis thaliana (L.) Heynh. cv. 'Columbia' was used to investigate the effect of low oxygen on ethylene

Thioltransferase from Arabidopsis thaliana seed: purification to homogeneity and characterization.

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Logáil Isteach / Cláraigh

Thioltransferase is a general GSH-disulfide reductase of importance for redox regulation. The protein thioltransferase has been purified to apparent homogeneity on SDS-PAGE from the Arabidopsis thaliana seed. The purification procedures included DEAE-cellulose ion exchange chromatography, Sephadex

Conditional identification of phosphate-starvation-response mutants in Arabidopsis thaliana.

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Logáil Isteach / Cláraigh

Plants have evolved elaborate metabolic and developmental adaptations to low phosphorus availability. Biochemical responses to phosphate limitation include increased production and secretion of phosphate-acquisition proteins such as nucleases, acid phosphatases, and high-affinity phosphate

Proteomic analysis of alterations in the secretome of Arabidopsis thaliana suspension cells subjected to nutritional phosphate deficiency.

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Logáil Isteach / Cláraigh

A proteomic approach was applied to compare the secretome (culture filtrate proteome) of phosphate-sufficient (+Pi) and Pi-deficient (-Pi) Arabidopsis thaliana suspension cell cultures. Secretomes harvested from the +Pi and -Pi cells yielded dissimilar 2-DE maps. PMF via MALDI-TOF MS resulted in the

Characterization of a ribonuclease III-like protein required for cleavage of the pre-rRNA in the 3'ETS in Arabidopsis.

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Logáil Isteach / Cláraigh

Ribonuclease III (RNaseIII) is responsible for processing and maturation of RNA precursors into functional rRNA, mRNA and other small RNA. In contrast to bacterial and yeast cells, higher eukaryotes contain at least three classes of RNaseIII, including class IV or dicer-like proteins. Here, we

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