Sequence analysis of infectious pancreatic necrosis virus genome segment B and its encoded VP1 protein: a putative RNA-dependent RNA polymerase lacking the Gly-Asp-Asp motif

The genome segment B sequence of infectious pancreatic necrosis virus was determined for both the Jasper and Sp serotypes. The sequences are 2784 and 2630 bp long, respectively, and contain a single large open reading frame encoding the VP1 protein, the putative RNA-dependent RNA polymerase (RdRp) of IPNV. The proteins exhibit an 88% homology with each other, but only 41% with infectious bursal disease virus (IBDV) VP1, another member of the Birnaviridae. Despite the low overall homology between the IPNV and IBDV VP1 proteins, homologous regions were detected within the central portion of the proteins. The carboxy-proximal regions of the VP1, which contain very low amino acid homology, displayed evidence of conservation in structural features such as a hydrophilic, highly basic domain. Consensus sequences associated with GTP-binding proteins and RdRps were also detected in VP1. However, unlike the RdRps associated with single-stranded plus RNA viruses, the birnavirus RdRp lacks the Gly-Asp-Asp motif characteristic of this enzyme family.     

Identification of bent DNA and ARS fragments in the genome of Choristoneura fumiferana nuclear polyhedrosis virus.

We identified four CfMNPV DNA fragments with autonomously replicating sequences (ARS) functional in Saccharomyces cerevisiae. A 0.9-kb fragment which, mapped to 54.5 to 55.3 map units within EcoRI HI of the CfMNPV genome, showed the strongest ARS activity of the four. Sequence analysis of this 0.9-kb DNA segment revealed an A+T-rich region separated from a G+C-rich region by 320 bp. Although no sequence matched exactly the ARS core-consensus sequence, 13 near-matches differing by only one or two nucleotides from the core-consensus sequence, were identified. Ten near-matches were clustered within a 105-bp A+T-rich region, and were arranged as inverted repeats. A section of bent DNA structure was predicted within this region. The bent DNA, which showed temperature-dependent retardation during polyacrylamide gel electrophoresis, was unique as its sequence was arranged as a symmetrical 'tilde' (approximately) structure. The second (1.0 kb) and third (1.6 kb) ARS-bearing fragments mapped within EcoRI-E and -B fragments which contain homologous repeat sequences. The fourth (1.5 kb) fragment had the weakest ARS activity and mapped to the EcoRI-D or -B regions of the genome.     

Komplementäre Therapien in der Onkologie

Die Gynäkologie - Komplementärmedizin wird im Sinne einer integrativen Onkologie ergänzend zur konventionellen Medizin eingesetzt und grenzt sich damit ab von der sog....