Comparison of the genome organization of toro- and coronaviruses: Evidence for two nonhomologous RNA recombination events during berne virus evolution
Identifieur interne : 001C02 ( Main/Merge ); précédent : 001C01; suivant : 001C03Comparison of the genome organization of toro- and coronaviruses: Evidence for two nonhomologous RNA recombination events during berne virus evolution
Auteurs : Eric J. Snijder [Pays-Bas] ; Johan A. Den Boon [Pays-Bas] ; Marian C. Horzinek [Pays-Bas] ; Willy J. M. Spaan [Pays-Bas]Source :
- Virology [ 0042-6822 ] ; 1991.
English descriptors
- Teeft :
- Academic press, Accession number, Acid residues, Amino, Amino acid sequence, Amino acids, Berne virus, Codon, Common ancestry, Coronaviral, Coronaviruses, Embl nucleotide sequence database, Genome, Genome organization, Horzinek, Independent nonhomologous, Independent recombination events, Influenza virus, Initiation codon, Methionine residue, Nonhomologous, Nucleic acids, Nucleotide, Nucleotide sequence analysis, Nucleotide sequence data, Orfl, Orfla product, Polla, Polymerase, Polymerase genes, Polymerase proteins, Protein gene, Recombination, Recombination events, Ribosomal frameshifting site, Sequence analysis, Sequence similarity, Short communications, Similar size, Spaan, State university, Termination codon, Torovirus, Viral, Weiss.
Abstract
Abstract: Recently, toroviruses and coronaviruses have been found to be ancestrally related by divergence of their polymerase and envelope proteins from common ancestors. In addition, their genome organization and expression strategy, which involves the synthesis of a 3′-coterminal nested set of mRNAs, are comparable. Nucleotide sequence analysis of the genome of the torovirus prototype, Berne virus (BEV), has now revealed the results of two independent nonhomologous RNA recombinations during torovirus evolution. Berne virus open reading frame (ORF) 4 encodes a protein with significant sequence similarity (30–35% identical residues) to a part of the hemagglutinin esterase proteins of corona-viruses and influenza virus C. The sequence of the C-terminal part of the predicted BEV polymerase ORF1a product contains 31–36% identical amino acids when compared with the sequence of a nonstructural 3032K corona-virus protein. The cluster of coronaviruses which contains this nonstructural gene expresses it not as a part of their polymerase, but by synthesizing an additional subgenomic mRNA.
Url:
DOI: 10.1016/0042-6822(91)90056-H
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<front><div type="abstract" xml:lang="en">Abstract: Recently, toroviruses and coronaviruses have been found to be ancestrally related by divergence of their polymerase and envelope proteins from common ancestors. In addition, their genome organization and expression strategy, which involves the synthesis of a 3′-coterminal nested set of mRNAs, are comparable. Nucleotide sequence analysis of the genome of the torovirus prototype, Berne virus (BEV), has now revealed the results of two independent nonhomologous RNA recombinations during torovirus evolution. Berne virus open reading frame (ORF) 4 encodes a protein with significant sequence similarity (30–35% identical residues) to a part of the hemagglutinin esterase proteins of corona-viruses and influenza virus C. The sequence of the C-terminal part of the predicted BEV polymerase ORF1a product contains 31–36% identical amino acids when compared with the sequence of a nonstructural 3032K corona-virus protein. The cluster of coronaviruses which contains this nonstructural gene expresses it not as a part of their polymerase, but by synthesizing an additional subgenomic mRNA.</div>
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