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Wyświetlanie 1-15 z 19
Tytuł:
Aminoacyl-tRNA synthetases and aminoacylation of tRNA in the nucleus.
Autorzy:
Mucha, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1043799.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
nuclear translation
nuclear localization signal
nuclear export
aminoacyl-tRNA synthetase
tRNA aminoacylation
Opis:
This review is focused on findings concerning the presence of translation apparatus components (aminoacyl-tRNA synthetases, aminoacyl-tRNA, elongation factors) as well as translation itself in the nucleus. A nuclear role of these molecules is unknown. New findings suggest that well-accepted model of spatial segregation of transcription and translation in eukaryotic cell may be oversimplifcation. Nuclear coupling of both these processes show us how exciting and surprising may be the world of the living cell.
Źródło:
Acta Biochimica Polonica; 2002, 49, 1; 1-10
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear localization and binding affinity of STAT5b for the α2-macroglobulin gene promoter during rat liver development and the acute-phase response
Autorzy:
Mihailović, Mirjana
Dinić, Svetlana
Bogojević, Desanka
Ivanović-Matić, Svetlana
Uskoković, Aleksandra
Arambašić, Jelena
Grigorov, Ilijana
Grdović, Nevena
Vidaković, Melita
Martinović, Vesna
Petrović, Miodrag
Poznanović, Goran
Powiązania:
https://bibliotekanauki.pl/articles/1041082.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
rat liver development
phosphorylation
nuclear extract
nuclear matrix
STAT5b
α2-macroglobulin
Opis:
Expression of the rat α2-macroglobulin (MG) gene undergoes dynamic changes throughout an individual's life and during the acute-phase (AP) response. Details of the participation of the STAT family of transcription factors in its control remain incompletely understood. Here we examined the involvement of STAT5b in MG gene expression during development and the AP response. Immuno-blot analysis revealed the highest nuclear level of STAT5b in the fetus and during postnatal development, whereas in the adult it decreased. Stimulation of MG expression during the AP response was accompanied by a decrease in STAT5b. Examination of STAT5b localization revealed that the relative concentrations of STAT5b were higher in the nuclear matrix than in the nuclear extract. Affinity chromatography with the extended promoter region of the MG gene (-825/+12), followed by immuno-blot analysis, revealed dynamic changes in STAT5b binding. The highest concentration of the promoter-binding form of STAT5b was observed in the fetus. As postnatal development progressed, the level of promoter-bound STAT5b decreased and in the adult liver it was the lowest. Stimulation of MG gene expression during the AP response in both the fetus and adult was accompanied by significantly decreased STAT5b binding to the MG promoter. The AP response was accompanied by lower levels of STAT5b serine and tyrosine phosphorylation in both fetus and adult. In the nuclear matrix derived from adult tissues, tyrosine phosphorylated species were completely absent. We conclude that developmental-stage differences in the mechanisms that determine STAT5b nuclear localization contribute to its activity in vivo.
Źródło:
Acta Biochimica Polonica; 2007, 54, 2; 331-340
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A compound C-terminal nuclear localization signal of human SA2 stromalin
Autorzy:
Tarnowski, Leszek
Milewski, Michal
Fronk, Jan
Kurlandzka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1039094.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
bipartite NLS
nuclear import
SA2 stromalin
Opis:
Stromalins are evolutionarily conserved multifunctional proteins with the best known function in sister chromatid cohesion. Human SA2 stromalin, likely involved in the establishment of cohesion, contains numerous potential nuclear localization (NLS) and nuclear export signals (NES). Previously we have found that the C-terminus of SA2 contains NLS(s) functional in human cells. However, the identity of this signal remained unclear since three NLS-like sequences are present in that region. Here we analyzed the functionality of these putative signals by expressing GFP-tagged C-terminal part of SA2 or its fragments in a human cell line and in the yeast Saccharomyces cerevisiae. We found that in human cells the nuclear import is dependent on a unique compound di- or tripartite signal containing unusually long linkers between clusters of basic amino acids. Upon expression of the same SA2 fragment in yeast this signal is also functional and can be easily studied in more detail.
Źródło:
Acta Biochimica Polonica; 2015, 62, 2; 215-219
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boric acid as a protector against paclitaxel genotoxicity
Autorzy:
Turkez, Hasan
Tatar, Abdulgani
Hacımuftuoglu, Ahmet
Ozdemir, Ebru
Powiązania:
https://bibliotekanauki.pl/articles/1040430.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
boric acid
paclitaxel
sister chromatid exchange
micronucleus
nuclear division index
Opis:
Paclitaxel (PAC) is an anticancer drug used for treatments of breast, ovarian and lung cancers. However, little data is available in the literature on its potential genotoxicity on healthy human cells. On the other hand, boron deficiency and supplementation exert important biological effects in human and animal tissues. The biological effects of dietary boron are defined, but its interaction with PAC is not known for therapeutic uses. The aim of the present study was to determine whether boric acid (BA) confer a protection against PAC genotoxicity. After the application of PAC (10 or 20 µg/l) and BA (2.5 or 5 mg/l), the genotoxic effects were assessed by sister chromatid exchange (SCE) and micronucleus (MN) tests in human blood cultures. We also analyzed nuclear division index (NDI) in peripheral lymphocytes. Our results showed that PAC significantly (P<0.05) increased the frequencies of SCEs and the formations of MNs in peripheral lymphocytes as compared to controls. PAC decreased the nuclear division index in lymphocyte cultures. Boric acid did not show cytotoxic or genotoxic effects at the concentrations tested. Furthermore, the PAC-induced increases in the genotoxicity and cytotoxicity indices were diminished by the addition of BA. The present study suggests for the first time that BA can prevent the genotoxicity of PAC on human lymphocytes.
Źródło:
Acta Biochimica Polonica; 2010, 57, 1; 95-97
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intranuclear trafficking of plasmid DNA is mediated by nuclear polymeric proteins lamins and actin
Autorzy:
Ondřej, Vladan
Lukášová, Emilie
Krejčí, Jana
Kozubek, Stanislav
Powiązania:
https://bibliotekanauki.pl/articles/1040744.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
plasmid DNA
DNA double-strand breaks
nuclear actin
lamin A/C
Opis:
Functions of nuclear polymeric proteins such as lamin A/C and actin in transport of plasmid DNA were studied. The results show that the lamina plays an important role in plasmid DNA's entry into the cell nucleus from the cytoplasm. Selective disruption of lamin A/C led to a halt in plasmid DNA transport through the nuclear envelope. Inside the nucleus, plasmid DNA was frequently localized at sites with impaired genome integrity, such as DNA double-strand breaks (DSBs), occurring spontaneously or induced by ionizing radiation. Polymeric actin obviously participates in nuclear transport of plasmid DNA, since inhibition of actin polymerization by latrunculin B disturbed plasmid transport inside the cell nucleus. In addition, precluding of actin polymerization inhibited plasmid co-localization with newly induced DSBs. These findings indicate the crucial role of polymeric actin in intranuclear plasmid transport.
Źródło:
Acta Biochimica Polonica; 2008, 55, 2; 307-315
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functionality versus strength - has functional selection taken place in the case of the ecdysteroid receptor response element?
Autorzy:
Grad, Iwona
Kochman, Marian
Ożyhar, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1043745.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
ultraspiracle
nuclear receptor
Drosophila
protein-DNA interaction
ecdysteroid receptor
20-hydroxyecdysone
Opis:
Nuclear receptors are ligand-dependent transcription factors responsible for controlling differentiation, growth and development of higher eukaryotes. Three amino acids within the recognition α-helix of the DNA-binding domain of the nuclear receptors constitute the so-called "P-box" which determines response element specificity. In the ultraspiracle (Usp) protein, which together with EcR forms the heterodimeric ecdysone receptor, the P-box residues are E19, G20 and G23. Substitution of E19, the most characteristic amino acid for estrogen receptor-like P-boxes, with alanine showed that the mutation did not appreciably alter the affinity of the wild-type Usp DNA-binding domain (UspDBDWT) for a probe containing natural ecdysone response element (hsp27wt). Since in many cases E19 contacts a G/C base pair in position -4, which is absent in hsp27wt, we analysed the interaction of UspDBDWT, E19A and other P-box region mutants with the hsp27wt derivative which contains a G/C instead of an T/A base pair in position -4. UspDBDWT exhibited higher affinity for this element than for hsp27wt. Moreover, a different interaction pattern of P-box region mutants was also observed. Thus we conclude that the E19 residue of UspDBD is not involved in any hsp27wt sequence-discerning contacts. However, substitution of the hsp27wt T/A base pair in position -4 with G/C generates target sequence with distinct functional characteristics and possibly with a new specificity. These results could serve as a basis for understanding the role of the presence of a T/A or G/C base-pair in the position -4 in the two types of ecdysone response elements found in nature.
Źródło:
Acta Biochimica Polonica; 2002, 49, 3; 747-756
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thyroid hormones and their receptors in the regulation of cell proliferation
Autorzy:
Puzianowska-Kuznicka, Monika
Pietrzak, Maciej
Turowska, Olga
Nauman, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/1041151.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
thyroid hormone nuclear receptors (TRs)
oncoproteins
triiodothyronine (T3)
proliferation
mitogens
Opis:
In the present work, we have reviewed data showing that triiodothyronine and its nuclear receptors modify expression of different genes/proteins involved in cell cycle control beginning from growth factors (such as EGF and TGF-β), to cell surface receptors (EGFR), as well as proteins acting at the cell membrane (Ras), various transcription factors (c-Fos, c-Myc, E2F1), cyclins, Cip/Kip family of cdk2 inhibitors, and p53 inhibitor Mdm2 (Table 1). We have shown how TRs are also able to modify the fate of a cell, thanks to their ability to form complexes with other transcription factors such as p53 - a key regulator of apoptosis and proliferation. Available data show that the function of thyroid hormones and of their receptors on cell proliferation is not homogenous. In fact, it strongly depends on the cell type, its developmental state (progenitor or differentiated), its patho-physiological state (normal or tumor cell), and the so-called 'cellular context'. Therefore, it is not possible to uniformly recommend T3 treatment or T3 depletion to stop or initiate proliferation of all cell types. Instead, a very individual and careful action should be considered.
Źródło:
Acta Biochimica Polonica; 2006, 53, 4; 641-650
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nucleoside diphosphate kinase isoforms regulated by phytochrome A isolated from oat coleoptiles
Autorzy:
Hetmann, Anna
Kowalczyk, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/1040648.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
phytochrome A nuclear import
phytochrome A
NDPK isoforms
NDPK (nucleoside diphosphate kinase)
Opis:
Nucleoside diphosphate kinase (NDPK) (EC 2.7.4.6), the enzyme transferring the phosphate residue from ATP to nucleoside diphosphates, is localized mainly in the cytoplasm and mitochondria and in smaller amounts in cell nuclei and the microsomal fraction. Exposure of etiolated oat seedlings to red light causes an increase of the enzyme activity by about 42% in nuclear fraction, 7% in etioplastic and 14% in postetioplastic fraction. Endogenous phytochrome A, as visualized by an immunochemical method, translocates from the cytoplasm into the nucleus upon red, far-red or white light activation. Nuclei purified from oat seedlings contain two, and the postnuclear fraction four easily separated forms of NDPK. One of the nuclear isoforms (In) and one isoform isolated from the postnuclear fraction (IIpn) are activated by red light in the presence of phytochrome A purified from etiolated oat coleoptiles. Both phytochrome A-activated NDPKs purified to electrophoretic homogeneity have the same molecular mass (17-18 kDa) determined by SDS/PAGE. Both enzymes in the native form have similar molecular masses (71 and 63 kDa).
Źródło:
Acta Biochimica Polonica; 2009, 56, 1; 143-154
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Homologues of HSV-1 nuclear egress factor UL34 are potential phosphoinositide-binding proteins
Autorzy:
Wyrwicz, Lucjan
Koczyk, Grzegorz
Rychlewski, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/1040842.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
HSV-1
Herpesviridae
phosphoinositides
protein structure prediction
bioinformatics
UL34
nuclear egress
Opis:
During the herpesvirus replication cycle, viral transcription, DNA replication, formation of capsids and DNA packaging occur in the nucleus. The subsequent nuclear egress of newly synthesized nucleocapsids is performed by budding of the inner leaflet of the nuclear membrane, which creates the primary envelope. Although products of two genes conserved throughout the Herpesviridae family (HSV-1 UL34 and UL31) have previously been shown to be involved in the execution of this process, the molecular basis of their activity is not clear. Here we present results of protein structure prediction for the conserved domain of UL34. The applied methodology suggests that this protein adopts a pleckstrin homology (PH) fold to perform its function. A detailed inspection of the ligand binding site strongly supports the hypothesis that UL34 orthologs can recognize phosphoinositides. Since previous works suggest that alterations of UL34 gene product result in a drastic impairment of primary envelopment of HSV-1 and trapping of capsids in the nucleus, the presented data may lead to the development of novel anti-herpetic therapeutic strategies where analogs of phosphoinositides are administered.
Źródło:
Acta Biochimica Polonica; 2008, 55, 1; 207-213
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steroid signal transduction activated at the cell membrane: from plants to animals.
Autorzy:
Marcinkowska, Ewa
Więdłocha, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/1043743.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
signal transduction pathways
membrane receptors
nuclear receptors
transcription factors
translocation
steroid hormones
Opis:
Steroid hormones in plants and in animals are very important for physiological and developmental regulation. In animals steroid hormones are recognized by nuclear receptors, which transcriptionally regulate specific target genes following binding of the ligand. In addition, numerous rapid effects generated by steroids appear to be mediated by a mechanism not depending on the activation of nuclear receptors. Although the existence of separate membrane receptors was postulated many years ago and hundreds of reports supporting this hypothesis have been published, no animal membrane steroid receptor has been cloned to date. Meanwhile, a plant steroid receptor from Arabidopsis thaliana has been identified and cloned. It is a transmembrane protein which specifically recognizes plant steroids (brassinosteroids) at the cell surface and has a serine/threonine protein kinase activity. It seems that plants have no intracellular steroid receptors, since there are no genes homologous to the family of animal nuclear steroid receptors in the genome of A. thaliana. Since the reason of the rapid responses to steroid hormones in animal cells still remains obscure we show in this article two possible explanations of this phenomenon. Using 1,25-dihydroxyvitamin D3 as an example of animal steroid hormone, we review results of our and of other groups concordant with the hypothesis of membrane steroid receptors. We also review the results of experiments performed with ovarian hormones, that led their authors to the hypothesis explaining rapid steroid actions without distinct membrane steroid receptors. Finally, examples of polypeptide growth factor that similarly to steroids exhibit a dual mode of action, activating not only cell surface receptors, but also intracellular targets, are discussed.
Źródło:
Acta Biochimica Polonica; 2002, 49, 3; 735-745
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PDZ domain from Dishevelled - a specificity study
Autorzy:
Śmietana, Katarzyna
Mateja, Agnieszka
Krężel, Artur
Otlewski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1039926.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Dishevelled
Cl2FlAsH-EDT2
NES
nuclear export signal
PDZ
Wnt
Opis:
Intracellular signaling cascades induced by Wnt proteins play a key role in developmental processes and are implicated in cancerogenesis. It is still unclear how the cell determines which of the three possible Wnt response mechanisms should be activated, but the decision process is most likely dependent on Dishevelled proteins. Dishevelled family members interact with many diverse targets, however, molecular mechanisms underlying these binding events have not been comprehensively described so far. Here, we investigated the specificity of the PDZ domain from human Dishevelled-2 using C-terminal phage display, which led us to identification of a leucine-rich binding motif strongly resembling the consensus sequence of a nuclear export signal. PDZ interactions with several peptide and protein motifs (including the nuclear export signal sequence from Dishevelled-2 protein) were investigated in detail using fluorescence spectroscopy, mutational analysis and immunoenzymatic assays. The experiments showed that the PDZ domain can bind the nuclear export signal sequence of the Dishevelled-2 protein. Since the intracellular localization of Dishevelled is governed by nuclear localization and nuclear export signal sequences, it is possible that the intramolecular interaction between PDZ domain and the export signal could modulate the balance between nuclear and cytoplasmic pool of the Dishevelled protein. Such a regulatory mechanism would be of utmost importance for the differential activation of Wnt signaling cascades, leading to selective promotion of the nucleus-dependent Wnt β-catenin pathway at the expense of non-canonical Wnt signaling.
Źródło:
Acta Biochimica Polonica; 2011, 58, 2; 243-250
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, antimicrobial activity and structural studies of low molecular mass lysine dendrimers
Autorzy:
Janiszewska, Jolanta
Urbańczyk-Lipkowska, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/1041270.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
basic dendrimers
nuclear magnetic resonance (NMR).
natural antibacterial peptides
mass spectrometry (MS)
antibiotic resistance
Opis:
Four low molecular mass lysine dendrimers were synthesized by Boc chemistry in solution (155 and 169) and Fmoc chemistry on solid support (P2 and P13). The structure and fragmentation mode of the above dendrimers was investigated in gas phase by the LSI-MS and ESI-MS techniques. 1H and 13C NMR analysis in solution (d6-DMSO) allowed to confirm the correct structure. Antimicrobial activities of the dendrimers against Staphylococcus aureus, Escherichia coli and Candida albicans confirmed our hypothesis that the dendrimer structure can be used for construction of molecules interacting with biological membranes.
Źródło:
Acta Biochimica Polonica; 2006, 53, 1; 77-82
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The bovine tyrosine hydroxylase gene associates in vitro with the nuclear matrix by its first intron sequence*.;
Autorzy:
Lenartowski, Robert
Grzybowski, Tomasz
Miścicka-Śliwka, Danuta
Wojciechowski, Waldemar
Goc, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1043467.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
intronic S/MAR
tissue specificity
scaffold/matrix attachment region (S/MAR)
tyrosine hydroxylase
nuclear matrix
Opis:
Recently we have shown that in vitro binding of the proximal part of the human tyrosine hydroxylase gene to the nuclear matrix is correlated with its transcriptional activity. The strongest binding potential was predicted by computing for the first intron sequence (Lenartowski & Goc, 2002, Neurosci Lett.; 330 : 151-154). In this study a 16 kb fragment of the bovine genomic DNA containing the tyrosine hydroxylase gene was investigated for its affinity to the nuclear matrix. Only a 950 bp fragment encoding the distal part of the first intron, second exon and a few nucleotides of the second intron bound to the nuclear matrix. The binding was independent of the tissue-specific tyrosine hydroxylase gene activation. The fragment was subcloned and sequenced. Computer search pointed to one potential intronic matrix attachment region with two AP1-like sites embedded in the sequence. We conclude that even if the position of the matrix binding region is conserved among the tyrosine hydroxylase genes in mammals, its tissue specificity and/or function is not preserved or is achieved by different mechanisms.
Źródło:
Acta Biochimica Polonica; 2003, 50, 3; 865-873
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of nuclear factor-κB in the development of autoimmune diseases: a link between genes and environment
Autorzy:
Kuryłowicz, Alina
Nauman, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/1040661.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
autoimmune diseases
nuclear factor-κB (NF-κB)
genetic polymorphism
NF-κB targeted strategies
Opis:
Although autoimmune diseases are relatively common, mechanisms that lead to their development remain largely unknown. Nuclear factor-κB (NF-κB), as a key transcription factor involved in the regulation of immune responses and apoptosis, appears to be a good candidate for studies on the pathogenesis of autoimmunity. This review presents how perturbations of the NF-κB signaling pathway may contribute to self-tolerance failure, initiation of autoimmune inflammatory response as well as its persistent maintenance and therefore to the development of common autoimmune diseases including rheumatoid arthritis, multiple sclerosis, type 1 diabetes mellitus, thyroid autoimmune diseases, systemic lupus erythematosus as well as inflammatory bowel diseases and psoriasis. A special emphasis is put on the genetic variations in the NF-κB related genes and their possible association with susceptibility to autoimmune diseases, as well as on the therapeutic potential of the NF-κB targeted strategies in the treatment of autoimmunity.
Źródło:
Acta Biochimica Polonica; 2008, 55, 4; 629-647
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reactions of Pseudomonas aeruginosa pyocyanin with reduced glutathione
Autorzy:
Cheluvappa, Rajkumar
Shimmon, Ronald
Dawson, Michael
Hilmer, Sarah
Le Couteur, David
Powiązania:
https://bibliotekanauki.pl/articles/1040717.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Pseudomonas aeruginosa pyocyanin
superoxide dismutase
catalase
spectrophotometry
nuclear magnetic resonance imaging
glutathione
cystic fibrosis
oxidative stress
Opis:
Pseudomonas aeruginosa is the most common cause of chronic and recurrent lung infections in patients with cystic fibrosis (CF) whose sputa contain copious quantities of P. aeruginosa toxin, pyocyanin. Pyocyanin triggers tissue damage mainly by its redox cycling and induction of reactive oxygen species (ROS). The reactions between reduced glutathione (GSH) and pyocyanin were observed using absorption spectra from spectrophotometry and the reaction products analysed by nuclear magnetic resonance imaging. Pyocyanin reacted with GSH non-enzymatically at 37°C resulting in the production of red-brown products, spectophotometrically visible as a 480 nm maximum absorption peak after 24 h of incubation. The reaction was concentration-dependent on reduced glutathione but not on pyocyanin. Minimizing the accessibility of oxygen to the reaction decreased its rate. The anti-oxidant enzyme catalase circumvented the reaction. Proton-NMR analysis demonstrated the persistence of the original aromatic ring and the methyl-group of pyocyanin in the red-brown products. Anti-oxidant agents having thiol groups produced similar spectophotometrically visible peaks. The presence of a previously unidentified non-enzymatic GSH-dependent metabolic pathway for pyocyanin has thus been identified. The reaction between pyocyanin and GSH is concentration-, time-, and O2-dependent. The formation of H2O2 as an intermediate and the thiol group in GSH seem to be important in this reaction.
Źródło:
Acta Biochimica Polonica; 2008, 55, 3; 571-580
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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