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Wyszukujesz frazę "editing" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Potential protein activity modifications of amino acid variants in the human transcriptome
Autorzy:
Zyla, Joanna
Bulman, Robert
Badie, Christophe
Bouffler, Simon
Powiązania:
https://bibliotekanauki.pl/articles/1039132.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
RNA editing
amino acid variants
Opis:
Background: The occurrence of widespread RNA and DNA sequence differences in the human transcriptome was reported in 2011. Similar findings were described in a second independent publication on personal omics profiling investigating the occurrence of dynamic molecular and related medical phenotypes. The suggestion that the RNA sequence variation was likely to affect disease susceptibility prompted us to investigate with a range of algorithms the amino acid variants reported to be present in the identified peptides to determine if they might be disease-causing. Results: The predictive qualities of the different algorithms were first evaluated by using nonsynonymous single-base nucleotide polymorphism (nsSNP) datasets, using independently established data on amino acid variants in several proteins as well as data obtained by mutational mapping and modelling of binding sites in the human serotonin transporter protein (hSERT). Validation of the used predictive algorithms was at a 75% level. Using the same algorithms, we found that widespread RNA and DNA sequence differences were predicted to impair the function of the peptides in over 57% of cases. Conclusions: Our findings suggest that a proportion of edited RNAs which serve as templates for protein synthesis is likely to modify protein function, possibly as an adaptive survival mechanism in response to environmental modifications.
Źródło:
Acta Biochimica Polonica; 2015, 62, 1; 57-61
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Editing of plant mitochondrial transfer RNAs
Autorzy:
Fey, Julien
Weil, Jacques
Tomita, K
Cosset, Anne
Dietrich, André
Small, Ian
Maréchal-Drouard, Laurence
Powiązania:
https://bibliotekanauki.pl/articles/1044127.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
tRNA
pseudouridine
plant mitochondria
processing
RNA editing
Opis:
Editing in plant mitochondria consists in C to U changes and mainly affects messenger RNAs, thus providing the correct genetic information for the biosynthesis of mitochondrial (mt) proteins. But editing can also affect some of the plant mt tRNAs encoded by the mt genome. In dicots, a C to U editing event corrects a C:A mismatch into a U:A base-pair in the acceptor stem of mt tRNAPhe (GAA). In larch mitochondria, three C to U editing events restore U:A base-pairs in the acceptor stem, D stem and anticodon stem, respectively, of mt tRNAHis (GUG). For both these mt tRNAs editing of the precursors is a prerequisite for their processing into mature tRNAs. In potato mt tRNACys (GCA), editing converts a C28:U42 mismatch in the anticodon stem into a U28:U42 non-canonical base-pair, and reverse transcriptase minisequencing has shown that the mature mt tRNACys is fully edited. In the bryophyte Marchantia polymorpha this U residue is encoded in the mt genome and evolutionary studies suggest that restoration of the U28 residue is necessary when it is not encoded in the gene. However, in vitro studies have shown that neither processing of the precursor nor aminoacylation of tRNACys requires C to U editing at this position. But sequencing of the purified mt tRNACys has shown that is present at position 28, indicating that C to U editing is a prerequisite for the subsequent isomerization of U into Ψ at position 28.
Źródło:
Acta Biochimica Polonica; 2001, 48, 2; 383-389
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The fidelity of the translation of the genetic code.
Autorzy:
Sankaranarayanan, Rajan
Moras, Dino
Powiązania:
https://bibliotekanauki.pl/articles/1044119.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
evolution
genetic code
translation
editing
aminoacyl-tRNA synthetase
Opis:
Aminoacyl-tRNA synthetases play a central role in maintaining accuracy during the translation of the genetic code. To achieve this challenging task they have to discriminate against amino acids that are very closely related not only in structure but also in chemical nature. A 'double-sieve' editing model was proposed in the late seventies to explain how two closely related amino acids may be discriminated. However, a clear understanding of this mechanism required structural information on synthetases that are faced with such a problem of amino acid discrimination. The first structural basis for the editing model came recently from the crystal structure of isoleucyl-tRNA synthetase, a class I synthetase, which has to discriminate against valine. The structure showed the presence of two catalytic sites in the same enzyme, one for activation, a coarse sieve which binds both isoleucine and valine, and another for editing, a fine sieve which binds only valine and rejects isoleucine. Another structure of the enzyme in complex with tRNA showed that the tRNA is responsible for the translocation of the misactivated amino-acid substrate from the catalytic site to the editing site. These studies were mainly focused on class I synthetases and the situation was not clear about how class II enzymes discriminate against similar amino acids. The recent structural and enzymatic studies on threonyl-tRNA synthetase, a class II enzyme, reveal how this challenging task is achieved by using a unique zinc ion in the active site as well as by employing a separate domain for specific editing activity. These studies led us to propose a model which emphasizes the mirror symmetrical approach of the two classes of enzymes and highlights that tRNA is the key player in the evolution of these class of enzymes.
Źródło:
Acta Biochimica Polonica; 2001, 48, 2; 323-335
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differences in editing of mitochondrial nad3 transcripts from CMS and fertile carrots.
Autorzy:
Rurek, Michał
Szklarczyk, Marek
Adamczyk, Natalia
Michalik, Barbara
Augustyniak, Halina
Powiązania:
https://bibliotekanauki.pl/articles/1044099.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cytoplasmic male sterility
Daucus carota
RNA editing
nad3 gene
Opis:
A high level of the nucleotide sequence conservation was found for mitochondrial nad3 gene of carrot. Three silent nucleotide substitutions differentiate nad3 open reading frames from cytoplasmic male sterile and male fertile carrots. All these differences are preserved on the RNA level. Partial and silent editing also distinguished both carrots. Three of the C to U conversions were specific to the fertile line. In the two examined carrot lines editing did not affect the mode of alteration of encoded amino acids.
Źródło:
Acta Biochimica Polonica; 2001, 48, 3; 711-717
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality control in tRNA charging - editing of homocysteine
Autorzy:
Jakubowski, Hieronim
Powiązania:
https://bibliotekanauki.pl/articles/1039906.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
tRNA synthetase editing
homocysteine
protein synthesis
protein modification
cardiovascular disease
neurodegeneration
Opis:
All living organisms conduct protein synthesis with a high degree of accuracy maintained in the transmission and flow of information from a gene to protein product. One crucial 'quality control' point in maintaining a high level of accuracy is the selectivity by which aminoacyl-tRNA synthetases furnish correctly activated amino acids, attached to tRNA species, as the building blocks for growing protein chains. When differences in binding energies of amino acids to an aminoacyl-tRNA synthetase are inadequate, editing is used as a major determinant of enzyme selectivity. Some incorrect amino acids are edited at the active site before the transfer to tRNA (pre-transfer editing), while others are edited after transfer to tRNA at a separate editing site (post-transfer editing). Access of natural non-protein amino acids, such as homocysteine, homoserine, or ornithine to the genetic code is prevented by the editing function of aminoacyl-tRNA synthetases. Disabling editing function leads to tRNA mischarging errors and incorporation of incorrect amino acids into protein, which is detrimental to cell homeostasis and inhibits growth. Continuous homocysteine editing by methionyl-tRNA synthetase, resulting in the synthesis of homocysteine thiolactone, is part of the process of tRNA aminoacylation in living organisms, from bacteria to man. Excessive homocysteine thiolactone synthesis in hyperhomocysteinemia caused by genetic or nutritional deficiencies is linked to human vascular and neurological diseases.
Źródło:
Acta Biochimica Polonica; 2011, 58, 2; 149-163
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The left-handed double helical nucleic acids.
Autorzy:
Brown, Bernard
Rich, Alexander
Powiązania:
https://bibliotekanauki.pl/articles/1044114.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:

Z-RNA
Z-DNA
RNA editing
hypermutation
ADAR1
Opis:
The conversion of right-handed dsDNA and dsRNA to the left-handed Z-conformation involves a reorganization of the nucleotides relative to each other. This conversion can be facilitated by the tight binding of a Z-conformation-specific protein domain from the editing enzyme dsRNA adenosine deaminase. This may influence the modification of both pre-mRNAs as well as some replicating RNA viruses.
Źródło:
Acta Biochimica Polonica; 2001, 48, 2; 295-312
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regulatory mechanisms of gene expression: complexity with elements of deterministic chaos
Autorzy:
Jura, Jolanta
Węgrzyn, Paulina
Jura, Jacek
Koj, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/1041263.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
linear and nonlinear responses
somatic recombination
biallelic expression
alternative splicing
epigenetics
RNA editing
monoallelic expression
Opis:
Linear models based on proportionality between variables have been commonly applied in biology and medicine but in many cases they do not describe correctly the complex relationships of living organisms and now are being replaced by nonlinear theories of deterministic chaos. Recent advances in molecular biology and genome sequencing may lead to a simplistic view that all life processes in a cell, or in the whole organism, are strictly and in a linear fashion controlled by genes. In reality, the existing phenotype arises from a complex interaction of the genome and various environmental factors. Regulation of gene expression in the animal organism occurs at the level of epigenetic DNA modification, RNA transcription, mRNA translation, and many additional alterations of nascent proteins. The process of transcription is highly complicated and includes hundreds of transcription factors, enhancers and silencers, as well as various species of low molecular mass RNAs. In addition, alternative splicing or mRNA editing can generate a family of polypeptides from a single gene. Rearrangement of coding DNA sequences during somatic recombination is the source of great variability in the structure of immunoglobulins and some other proteins. The process of rearrangement of immunoglobulin genes, or such phenomena as parental imprinting of some genes, appear to occur in a random fashion. Therefore, it seems that the mechanism of genetic information flow from DNA to mature proteins does not fit the category of linear relationship based on simple reductionism or hard determinism but would be probably better described by nonlinear models, such as deterministic chaos.
Źródło:
Acta Biochimica Polonica; 2006, 53, 1; 1-10
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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