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Multiple coding sequences for the genome-linked virus protein (VPg) in dicistroviruses.
Nobuhiko Nakashima1, Norihiro Shibuya
1National Institute of Agrobiological Sciences, Owashi, Tsukuba, Ibaraki 305-8634, Japan. nakaji@affrc.go.jp
Journal of Invertebrate Pathology
|May 19, 2006
Summary
Researchers found multiple copies of the genome-linked viral protein (VPg) in dicistroviruses. This redundancy likely enhances viral multiplication by increasing VPg protein production.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- The genome-linked viral protein (VPg) is essential for picornavirus replication.
- Dicistroviruses, a family of small RNA viruses, possess a unique genome structure and replication strategy.
- The function and coding of VPg in dicistroviruses have not been fully elucidated.
Purpose of the Study:
- To investigate the coding and potential function of the VPg in Plautia stali intestine virus (PSIV).
- To explore the prevalence and variation of VPg-like sequences across different dicistrovirus species.
- To hypothesize the role of VPg sequence redundancy in dicistrovirus replication.
Main Methods:
- N-terminal Edman sequencing was employed to determine the VPg sequence of PSIV.
- Bioinformatic analysis was conducted to identify and compare VPg-like sequences in multiple dicistrovirus genomes.
Main Results:
- N-terminal Edman sequencing of PSIV VPg revealed unexpected heterologous residues.
- The determined VPg sequence was found to be triplicated within the nonstructural protein precursor of PSIV.
- VPg-like sequences were identified in 10 out of 12 dicistroviruses analyzed, with up to six copies observed in Solenopsis invicta virus-1.
Conclusions:
- The study suggests that redundant VPg coding sequences are a common feature in dicistroviruses.
- This genomic characteristic is postulated to facilitate viral multiplication.
- Fewer translation cycles of the nonstructural protein precursor may lead to increased VPg protein production, paralleling capsid protein synthesis mediated by internal ribosome entry site (IRES) translation.