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    Wyświetlanie 1-3 z 3
    Tytuł:
    Inhibition of the helicase activity of HCV NTPase/helicase by 1-β-D-ribofuranosyl-1,2,4-triazole-3-carboxamide-5-triphosphate (ribavirin-TP).
    Autorzy:
    Borowski, Peter
    Lang, Melanie
    Niebuhr, Andreas
    Haag, Annemarie
    Schmitz, Herbert
    Schulze zur Wiesch, Julian
    Choe, Joonho
    Siwecka, Maria
    Kulikowski, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1044103.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    ribavirin-5'-triphosphate
    enzyme inhibition
    HCV helicase
    Opis:
    In the presented study the ribavirin-TP - an established inhibitor of the NTPase activity of the superfamily NTPase/helicases II - was investigated as an inhibitor of the unwinding activity of the hepatitis C virus (HCV) NTPase/helicase. The kinetics of the reaction revealed that ribavirin-TP reduces the turnover number of the helicase reaction by a mechanism that does not correspond to that of the inhibition of the NTPase activity. Our results suggest that derivatives of ribavirin-TP with enhanced stability towards hydrolytic attack may be effective inhibitors of the enzyme.
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 3; 739-744
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ATP-binding domain of NTPase/helicase as a target for hepatitis C antiviral therapy.
    Autorzy:
    Borowski, Peter
    Mueller, Oliver
    Niebuhr, Andreas
    Kalitzky, Matthias
    Hwang, Lih-Hwa
    Schmitz, Herbert
    Siwecka, Maria
    Kulikowski, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1044428.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    ribavirin-5'-triphosphate
    enzyme inhibition
    HCV NTPase/helicase
    Opis:
    To enhance the inhibitory potential of 1-β-D-ribofuranosyl-1,2,4-triazole-3-carboxamide (ribavirin) vs hepatitis C virus (HCV) NTPase/helicase, ribavirin-5'-triphosphate (ribavirin-TP) was synthesized and investigated. Ribavirin-TP was prepared with the use of modified Yoshikawa-Ludwig-Mishra-Broom procedure (cf. Mishra & Broom, 1991, J. Chem. Soc., Chem. Commun, 1276-1277) involving phosphorylation of unprotected nucleoside. Kinetic analysis revealed enhanced inhibitory potential of ribavirin-TP (IC50=40 μM) as compared to ribavirin (IC50 > 500 μM). Analysis of the inhibition type by means of graphical methods showed a competitive type of inhibition with respect to ATP. In view of the relatively low specificity towards nucleoside-5'-triphosphates (NTP) of the viral NTPase/helicases, it could not be ruled out that the investigated enzyme hydrolyzed the ribavirin-TP to less potent products. Investigations on non- hydrolysable analogs of ribavirin-TP or ribavirin-5'-diphosphate (ribavirin-DP) are currently under way.
    Źródło:
    Acta Biochimica Polonica; 2000, 47, 1; 173-180
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sustained virologic response and IL28B single-nucleotide polymorphisms in patients with chronic hepatitis C treated with pegylated interferon alfa and ribavirin
    Autorzy:
    Jabłonowska, Elżbieta
    Piekarska, Anna
    Koślińska-Berkan, Ewa
    Omulecka, Aleksandra
    Szymańska, Bożena
    Wójcik, Kamila
    Powiązania:
    https://bibliotekanauki.pl/articles/1039705.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    ribavirin
    interferon
    HCV
    IL28B
    HIV
    sustained virologic response
    Opis:
    Introduction. Hepatitis C virus (HCV) infection is a global health problem which can lead to liver cirrhosis or hepatocellular carcinoma in one-fifth of chronically infected patients. Materials and methods. The study group consisted of 123 patients: 90 with HCV mono- and 33 with HIV/HCV co-infection, who were treated with pegylated interferon alfa (Peg-IFN-α) and ribavirin. We analyzed selected pretreatment factors: age, sex, HIV/HCV co-infection, grade of inflammation, necrotic changes and fibrosis in histological analysis of liver bioptates, HCV viral load, HCV genotypes, and single nucleotide polymorphisms (SNPs) of IL28B and tried to find out which of them influence sustained virological response (SVR). The IL28B SNP C/T (rs12979860) was analyzed using Custom® SNP Genotyping Assays (Applied Biosystems). Results. Multivariate analysis demonstrated that after adjusting for the other variables three predictors independently influence SVR, namely genotype 3 of HCV, presence of the CC genotype and age >40 years (OR respectively 15.14, 3.62, and 0.36). HCV mono-infected patients were infected with HCV genotype 3 or 4 less frequently (p=0.0001) compared to HIV/HCV co-infected individuals. In patients with HIV/HCV co-infection the CC variant occurred more frequently whereas CT was found less frequently (p=0.001, p=0.0146, respectively). In patients with HIV/HCV co-infection, 3 and 4 genotype of HCV occurred more frequently compared to patients with HCV mono-infection (p=0.0001). Conclusions. These data suggest that age, HCV genotype and IL28B polymorphism are useful for prediction of the response to treatment with Peg-IFN-α and ribavirin. The more frequent occurrence of HCV genotypes 3 or 4 in patients with HIV/HCV co-infection could be associated with the route of transmission.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 3; 333-337
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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