PubMed Health⌕ Search

Biomedical subjects

C L Mason

Publications and source records attributed to C L Mason.

4 recordsLinked to original sources
PubMed1991

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.

Amino Acid Sequence↗
PubMed1990

Cell-free translational analysis of the processing of infectious pancreatic necrosis virus polyprotein.

A cDNA clone of the large genomic segment of infectious pancreatic necrosis virus (IPNV) was inserted into transcription vectors and used for production of RNA transcripts of various lengths. These RNA transcripts were used to prime the synthesis of virus-specific polypeptides in a rabbit reticulocyte translation system. Full-length transcripts resulted in the synthesis of processed viral proteins pVP2, NS, and VP3. Transcripts which were deleted in the VP2 coding region did not affect the processing of NS or VP3 and similarly, deletions in VP3 did not affect the formation of NS or VP2. However, deletions which extended into the NS coding region resulted in a loss of protease activity and the production of truncated precursor polypeptides. The virus-specific proteolytic activity could not be inhibited by specific antisera and a trans activity for the viral proteases could not be demonstrated.

Animals↗