Figure 3From: Bioinformatic evidence for a stem-loop structure 5'-adjacent to the IGR-IRES and for an overlapping gene in the bee paralysis dicistrovirusesNucleotide and amino acid sequence alignments and predicted RNA structures. (A1) Nucleotide alignment of ORFX and flanking regions for the sequences [GenBank:NC_009025] (IAPV), [GenBank:NC_004807] KBV, and [GenBank:NC_002548] (ABPV). Spaces separate +0/CDS2-frame codons. Colour coding is as follows: light blue - CDS2 IGR-IRES-mediated initiation site; red - ORFX termination codon; green - potential +1/ORFX-frame AUG initiation codons if ORFX is AUG-initiated (there are no intervening +0 or +2 frame AUG codons). Black arrows indicate the approximate expected initiation site if ORFX is IGR-IRES initiated (see text). Symbols '*' and 'x' represent completely conserved columns (based on a larger alignment comprising GenBank accession numbers NC_009025, EU436455, EU436456, EU436423, NC_004807, AY053375, AY053374, AY053372, AF486072, AY053367, AY053370, AY053366, AY053368, AF486073, AY053371 and NC_002548). (A2) The corresponding region in [GenBank:NC_006559] (SINV-1). (B) Amino acid alignment of the translated ORFX assuming initiation at the normal IGR-IRES initiation site but in the +1 reading frame. Methionine residues are highlighted in green. (C) Representative sequences showing a potential RNA hairpin structure directly upstream of the predicted IGR-IRES in the bee paralysis dicistroviruses. The CDS1 termination codons are underlined and in bold. The 5' end of the IGR-IRESs (as summarized in Ref. [11]) are underlined. Predicted base pairings are indicated by paired parentheses and coloured background shading. Substitutions that maintain the predicted base pairings are highlighted in blue (for single substitutions involving G:U pairings) or pink (for compensatory paired substitutions).Back to article page