Variola and camelpox virus-specific sequences are part of a single large open reading frame identified in two German cowpox virus strains.
A large open reading frame (ORF) has been identified in two German cowpox virus strains. The ORFs (5676 and 5679 nt, respectively) differ in 10 nucleotides, resulting in an amino acid homology of 99.8%. In searching GenBank nucleotide sequences (>90% identity) were present in several small ORFs in variola major, variola minor and camelpox virus genomes. Alignments revealed that these small ORFs are fragments of a large ORF. However, sequences of the ORF described here are entirely absent in the two cowpox virus reference strains. Databank analysis revealed amino acid identities (ranging from 25 to 39%) with so-called B22R-like poxviral proteins with unknown function encoded by several chordopoxviruses. Further sequencing of one cowpox virus strain under study identified an ORF (5790 nt) which displays high levels of nucleotide identity to ORFs present in several orthopoxvirus species. Taken together, the two cowpox viruses analyzed here contain one large ORF which is conserved within the genus Orthopoxvirus and a unique, more distantly related ORF of similar size, which is conserved in the subfamily Chordopoxvirinae.
Meyer
Hermann
H
Bundeswehr Institute of Microbiology, Neuherbergstr. 11, D-80937 Muenchen, Germany. hermann1meyer@bundeswehr.org
Totmenin
Alexei
A
Gavrilova
Elena
E
Shchelkunov
Sergei
S
D018147:Chordopoxvirinae / Q000235:genetics; D017124:Conserved Sequence; D015608:Cowpox virus / Q000235:genetics* / Q000302:isolation & purification; D004279:DNA, Viral / Q000737:chemistry / Q000302:isolation & purification; D005814:Genes, Viral; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D018155:Orthopoxvirus / Q000235:genetics* / Q000302:isolation & purification; D010802:Phylogeny; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017385:Sequence Homology; D012901:Variola virus / Q000235:genetics*
D004279:DNA, Viral