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1
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Synthesis and interaction with thymidylate synthase of 5'-dithiophosphate and 5'-fluorothiophosphate of thymidine

100%
Gołos B., Misiura K., Olesiak M., Okruszek A., Stecand Wojciech Rode W. J.
Acta Biochimica Polonica
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1998
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vol. 45
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issue 1
83-86
2
Content available remote

The effect of Arg209 to Lys mutation in mouse thymidylate synthase.

86%
Cieśla J., Gołos B., Wałajtys-Rode E., Jagielska E., Płucienniczak A., Rode W.
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2002
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vol. 49
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issue 3
651-658
EN
Mouse thymidylate synthase R209K (a mutation corresponding to R218K in Lactobacillus casei), overexpressed in thymidylate synthase-deficient Escherichia coli strain, was poorly soluble and with only feeble enzyme activity. The mutated protein, incubated with FdUMP and N5,10-methylenetetrahydrofolate, did not form a complex stable under conditions of SDS/polyacrylamide gel electrophoresis. The reaction catalyzed by the R209K enzyme (studied in a crude extract), compared to that catalyzed by purified wild-type recombinant mouse thymidylate synthase, showed the Km value for dUMP 571-fold higher and Vmax value over 50-fold (assuming that the mutated enzyme constituted 20% of total crude extract protein) lower. Thus the ratios kcat, R209K/kcat, 'wild' and (kcat, R209K/Km, R209KdUMP)/( kcat, 'wild'/Km, 'wild'dUMP) were 0.019 and 0.000032, respectively, documenting that mouse thymidylate synthase R209, similar to the corresponding L. casei R218, is essential for both dUMP binding and enzyme reaction.
3
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Effect of cyclosporin A on immunological response in lungs of guinea pigs infected with Trichinella spiralis.

86%
Dzik J. M., Zieliński Z., Gołos B., Jagielska E., Wranicz M., Wałajtys-Rode E.
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EN
The effects of cyclosporin A (CsA), a potent immunosuppressive drug with antiparasitic activity, on the innate immunological response in guinea pig lungs during an early period (6th and 14th days) after T. spiralis infection were studied. CsA treatment of T. spiralis-infected guinea pigs caused a significant attenuation of immunological response in lungs by decreasing lymphocyte infiltration into pulmonary alveolar space, inhibiting alveolar macrophage superoxide anion production and lowering both the production of NO metabolites measured in bronchoalveolar lavage fluid and expression of the iNOS protein in lung homogenates, allowing us to speculate that the T. spiralis-dependent immunological response is dependent on lymphocyte T function. Interestingly, CsA itself had a pro-inflammatory effect, promoting leucocyte accumulation and macrophage superoxide production in guinea pig lungs. This observation may have a relevance to the situation in patients undergoing CsA therapy. Macrophage expression of the iNOS protein, evaluated by immunoblotting was not influenced by treatment of animals with CsA or anti-TGF-antibody, indicating different regulation of the guinea pig and murine enzymes.
4
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Acyclic analogues of 5-fluoro-dUMP and 5-fluoro-2'-deoxyuridine: Synthesis and inhibition of thymidylate synthase and tumour cell growth

86%
Felczak K., Gołos B., Dzik J. M., Rode W., Bretner M., Shugar D., Kulikowski T.
Acta Biochimica Polonica
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1998
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vol. 45
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issue 1
75-82
5
Content available remote

Sulfamide antifolates inhibiting thymidylate synthase: synthesis, enzyme inhibition and cytotoxicity.

86%
Pawełczak K., Makowski M., Kempny M., Dzik J. M., Gołos B., Rode W., Rzeszotarska B.
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2002
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vol. 49
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issue 2
407-420
EN
Synthesis and biological evaluation are described of seven new analogues (3-9) of two potent thymidylate synthase inhibitors, 10-propargyl-5,8-dideazafolate (1) and its 2-methyl-2-deamino congener ICI 198583 (2). While the new compunds 3 and 4 were analogues of 1 and 2, respectively, containing a p-aminobenzenesulfonyl residue in place of the p-aminobenzoic acid residue, the remaining 5 new compounds were analogues of 4 with the L-glutamic acid residue replaced by glycine (5), L-valine (6), L-alanine (7), L-phenylglycine (8) or L-norvaline (9). The new analogues were tested as inhibitors of thymidylate synthases isolated from tumour (Ehrlich carcinoma), parasite (Hymenolepis diminuta) and normal tissue (regenerating rat liver) and found to be weaker inhibitors than the parent 10-propargyl-5,8-dideazafolic acid. Selected new analogues, tested as inhibitors of growth of mouse leukemia L 5178Y cells, were less potent than the parent 10-propargyl-5,8-dideazafolic acid. Substitution of the glutamyl residue in compound 4 with l-norvaline (9) resulted in only a 5-fold stronger thymidylate synthase inhibitor, but a 40-fold weaker cell growth inhibitor.
6
Content available remote

An isotopic assay of dUTPase activity based on coupling with thymidylate synthase

85%
Gołos B., Rode W.
Acta Biochimica Polonica
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1999
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vol. 46
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issue 3
837-840
7
Content available remote

Synthesis and biological activity of Nα-[4-[N-[(3,4-dihydro-2-methyl-4-oxo-6-quinazolinyl)methyl]-N-propargylamino]phenyl-acetyl]-L-glutamic acid.

73%
Kusakiewicz-Dawid A., Bugaj M., Dzik J. M., Gołos B., Wińska P., Pawełczak K., Rzeszotarska B., Rode W.
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2002
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vol. 49
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issue 1
197-202
EN
2-Deamino-2-methyl-N10-propargyl-5,8-dideazafolic acid (ICI 198583) is a potent inhibitor of thymidylate synthase. Its analogue, Nα-[4-[N-[(3,4-dihydro-2-methyl-4-oxo-6-quinazolinyl)methyl]-N-propargylamino]phenylacetyl]-L-glutamic acid, containing p-aminophenylacetic acid residue substituting p-aminobenzoic acid residue, was synthesized. The new analogue exhibited a moderately potent thymidylate synthase inhibition, of linear mixed type vs. the cofactor, N5,10 -methylenetetrahydrofolate. The Ki value of 0.34 μM, determined with a purified recombinant rat hepatoma enzyme, was about 30-fold higher than that reported for inhibition of thymidylate synthase from mouse leukemia L1210 cells by ICI 198583 (Hughes et al., 1990, J. Med. Chem. 33, 3060). Growth of mouse leukemia L5178Y cells was inhibited by the analogue (IC50 = 1.26 μM) 180-fold weaker than by ICI 198583 (IC50 = 6.9 μM).
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