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    Wyświetlanie 1-3 z 3
    Tytuł:
    Comparative biochemical analysis of lectin and nuclease from Chelidonium majus L.
    Autorzy:
    Fik, Ewa
    Dalgalarrondo, Michele
    Haertlé, Thomas
    Goździcka-Józefiak, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1044368.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    glycoproteins
    glycosylation
    plant lectins
    Chelidonium majus
    Opis:
    It has been recently recognized that lectins exhibit other activities besides hemagglutination. Previously we have found that purified lectin from Chelidonium majus showed DNase activity (Fik, Goździcka-Józefiak & Kędzia, 1995, Herba Polon. 41, 84-95). Comparison of lectin and DNase from the sap from leaves and roots of Chelidonium majus proved that both these compounds are composed of 24 kDa monomer subunits which have an identical N-terminal sequence but differ in amino-acid composition and degree of glycosylation. Possible interrelationship between lectin and DNase is discussed.
    Źródło:
    Acta Biochimica Polonica; 2000, 47, 2; 413-420
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of tunicamycin on the biogenesis of hepatitis C virus glycoproteins
    Autorzy:
    Reszka, Natalia
    Krol, Ewelina
    Patel, Arvind
    Szewczyk, Boguslaw
    Powiązania:
    https://bibliotekanauki.pl/articles/1040320.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    glycoproteins
    glycosylation inhibition
    hepatitis C virus
    tunicamycin
    Opis:
    Hepatitis C virus (HCV) infects humans, with a prevalence around 3% of population, causing acute and chronic hepatitis and hepatocellular carcinoma. We studied the effect of inhibition of glycosylation on the assembly of the HCV particle. HCV possesses two envelope glycoproteins E1 and E2 that are highly modified by N-glycans. These glycan residues are crucial for viral entry and maturation of the progeny. Here, we examined the influence of inhibition of N-glycosylation on expression of E1 and E2. Since the propagation of HCV in cell culture is limited, we used a recombinant baculovirus producing viral-like particles in insect cells. Our data showed that blocking of N-glycan transfer to the nascent polypeptide chain with the antibiotic tunicamycin resulted in the loss of E1 and E2. We also found that a dose of tunicamycin that did not influence the cell viability significantly reduced the E2 level in infected cells. The results indicate that blocking of glycosylation at an early step efficiently reduces the assembly of HCV virions. Thus, we suggest that derivatives of tunicamycin that preferentially block glycosylation of viral proteins may become potential therapeutic agents against HCV.
    Źródło:
    Acta Biochimica Polonica; 2010, 57, 4; 541-546
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of N-glycosylation inhibition on the synthesis and processing of classical swine fever virus glycoproteins
    Autorzy:
    Tyborowska, Jolanta
    Zdunek, Ewa
    Szewczyk, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/1040876.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    glycoproteins
    pestivirus
    glycosylation
    classical swine fever virus
    Opis:
    Classical swine fever virus (CSFV) is often used as a surrogate model in molecular studies of the closely related hepatitis C virus. In this report we have examined the effect of the inhibition of glycosylation on the survival and maturation of CSFV. Viral glycoproteins (Erns, E1, E2) form biologically active complexes - homo- and heterodimers, which are indispensable for viral life cycle. Those complexes are highly N-glycosylated. We studied the influence of N-glycosylation on dimer formation using Erns and E2 glycoproteins produced in insect cells after infection with recombinant baculoviruses. The glycoproteins were efficiently synthesized in insect cells, had similar molecular masses and formed dimers like their natural counterparts. Surprisingly, the addition of tunicamycin (an antibiotic which blocks early steps of glycosylation) to insect cell culture blocked not only dimer formation but it also led to an almost complete disappearance of E2 even in monomeric form. Tunicamycin did not exert a similar effect on the synthesis and formation of Erns dimers; the dimers were still formed, which suggests that Erns glycan chains are not necessary for dimer formation. We have also found that very low doses of tunicamycin (much lower than those used for blocking N-glycosylation) drastically reduced CSFV spread in SK6 (swine kidney) cell culture and the virus yield. These facts indicate that N-glycosylation inhibitors structurally similar to tunicamycin may be potential therapeutics for the inhibition of the spread of CSFV and related viruses.
    Źródło:
    Acta Biochimica Polonica; 2007, 54, 4; 813-819
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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