The rates of viral RNA and protein syntheses for wild-type RNA bacteriophages and their nonpolar, coat protein amber mutants were determined in amber suppressor (S26R1E, Su-1 and H12R8a, Su-3) and nonsuppressor (AB259, S26, and Q13) strains of Escherichia coli in the presence of rifamycin. It was demonstrated that the rates of synthesis of phage-specific replicase and RNA minus strands drop off concurrently in both wild-type and coat protein mutant-infected Suand Su' cells after 10 and 15 min postinfection, respectively. The rate of
Replication of RNA bacteriophages in the presence of rifamycin was studied in different Escherichia coli strains that vary in RNase content but are not isogenic: AB259 RNase+, Q13 RNase I-PNPase-, AB105 RNase I-RNase III-. It was found that rifamycin did not affect characteristics of phage replication such as the general pattern of viral RNA synthesis and intracellular development of the phage. These characteristics are strain specific and independent of the cell growth rate, which defines only phage release. The inhibition of cell division by rifamycin interfered with the release of the phage and thus produced an apparent effect of rifamycin on phage replication.
Введение. Клонирование вирионной ДНК в бактериях с расшифровкой ее первичной структуры [1] позволило локализовать в геноме вируса гепатита В (HBV) гены двух мажорных вирусных белков-поверхностного антигена (HBsAg) и кор-антигена (HBcAg), определяющих иммунологические свойства наружной липопротеидной оболочки вирусной частицы и ее внутреннего капсида (кора) соответственно. Корчастицы HBV обнаруживаются в клетках печени больных гепатитом В и несут в себе, помимо HBcAg и вирионной ДНК, вирусспецифическую ДНК-зависимую ДНК-полимеразу и «е»-антиген (IIBeAg) [1]. Последний представляет собой третью из известных антигенных систем IIВ V, присутствует в крови больных и вирусоносителей [2] и, что крайне интересно, закодирован в вирусном геноме тем же геном, что и IIBeAg [3].
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