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Complete genomic sequence of the Amsacta moorei entomopoxvirus: analysis and comparison with other poxviruses.

Bawden A.L., Glassberg K.J., Diggans J., Shaw R., Farmerie W., Moyer R.W.

The genome of the genus B entomopoxvirus from Amsacta moorei (AmEPV) was sequenced and found to contain 232,392 bases with 279 unique open reading frames (ORFs) of greater than 60 amino acids. The central core of the viral chromosome is flanked by 9.4-kb inverted terminal repeats (ITRs), each of which contains 13 ORFs, raising the total number of ORFs within the viral chromosome to 292. ORFs with no known homology to other poxvirus genes were shown to constitute 33.6% of the viral genome. Approximately 28.6% of the AmEPV genome encodes homologs of the mammalian poxvirus colinear core genes, which are found dispersed throughout the AmEPV chromosome. There is also no significant gene order conservation between AmEPV and the orthopteran genus B poxvirus of Melanoplus sanguinipes (MsEPV). Novel AmEPV genes include those encoding a putative ABC transporter and a Kunitz-motif protease inhibitor. The most unusual feature of the AmEPV genome relates to the viral encoded poly(A) polymerase. In all other poxviruses this heterodimeric enzyme consists of a single large and a single small subunit. However, AmEPV appears to encode one large and two distinct small poly(A) polymerase subunits. AmEPV is one of the few entomopoxviruses which can be grown and manipulated in cell culture. The complete genomic sequence of AmEPV paves the way for an understanding and comparison of the molecular properties and pathogenesis between the entomopoxviruses of insects and the more intensively studied vertebrate poxviruses.

Virology 274:120-139(2000) [PubMed] [Europe PMC]

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