By Karl Maramorosch, Aaron J. Shatkin
The Advances in Virus study sequence covers a various variety of in-depth experiences delivering a worthy evaluate of the present box of virology. This eclectic quantity comprises six studies overlaying issues on the subject of plant viruses, evolution of viruses with hosts and cellphone attractiveness via viruses.
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Extra resources for Advances in Virus Research, Vol. 63
Next, the DNA primer is extended all 28 URSULA SCHULTZ ET AL. the way to the 50 -end of the pgRNA template, yielding a complete (À)-DNA strand with a short terminal redundancy. 2. Concomitantly with (À)-DNA synthesis, the RNA template is degraded by the RNase H activity of P protein, except for a 50 -terminal oligonucleotide whose 30 -end consists of the 50 -copy of DR1. 3. For relaxed circular DNA formation, the RNA oligonucleotide is transferred to the third copy of the direct repeat, DR2, located shortly upstream of DR1*, where it serves as a conventional primer for (þ)-strand DNA synthesis (second template switch), which then proceeds to the 50 -end of the (À)-DNA, generating a short terminal redundancy.
The phosphorylated and nonphosphorylated forms of L are designated P35 and P36, respectively. A minor form of L, occasionally detected at approximately 37 kDa, may result from phosphorylation at additional Ser and Thr sites in preS. , 1993). , 1993; Grgacic and Anderson, 1994) originate from translation DUCK HEPATITIS B VIRUS 31 initiation at the other in-frame AUGs at 825, 882, and 957 is not clear. , 1991). A third envelope protein species (St), derived from the S protein, has been identified in serum particles and in endoplasmic reticulum (ER) fractions of infected primary hepatocyte cultures and transfected cells.
This strongly suggests that the structural rearrangement is functionally important to properly juxtapose the priming Tyr-residue in the TP domain and the polymerase active site on the template region within D". , 1998). A thorough mechanistic understanding will, however, eventually require direct 3-D structural data. This goal, until recently, seemed to be far out of reach, not only because of the difficulties in generating appreciable amounts of full-length recombinant P protein but also because the replication-competent P complexes generated in RL contained additional, functionally essential cellular components.