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Insect |
Department of Biology, Imperial College of Science, Technology and Medicine, Imperial College Road, London SW7 2AZ, UK1
Horticulture Research International, Wellesbourne, Warwick CV35 9EF, UK2
Authors for correspondence: David O’Reilly. Fax +44 20 75842056. e-mail dor{at}ic.ac.uk Doreen Winstanley. Fax +44 1789 470552. e-mail doreen.winstanley@hri.ac.uk
The nucleotide sequence of the DNA genome of Cydia pomonella granulovirus (CpGV) was determined and analysed. The genome is composed of 123500 bp and has a G+C content of 45·2%. It contains 143 ORFs of 150 nucleotides or more that show minimal overlap. One-hundred-and-eighteen (82·5%) of these putative genes are homologous to genes previously identified in other baculoviruses. Among them, 73 are homologous to genes of Autographa californica nucleopolyhedrovirus (AcMNPV), whereas 108 and 98 are homologous to genes of Xestia c-nigrum GV (XcGV) and Plutella xylostella GV (PxGV), respectively. These homologues show on average 37·4% overall amino acid sequence identity to those from AcMNPV and 45% to those from XcGV and PxGV. The CpGV gene content was compared to that of other baculoviruses. Several genes reported to have major roles in baculovirus biology were not found in the CpGV genome, such as gp64, the major budded virus glycoprotein gene in some nucleopolyhedroviruses, and lef-7, involved in DNA replication. However, the CpGV genome encodes the large and small subunits of ribonucleotide reductase, three inhibitor of apoptosis (iap) homologues and two protein tyrosine phosphatases. The CpGV, PxGV and XcGV genomes present a noticeably high level of conservation of gene order and orientation. A striking feature of the CpGV genome is the absence of typical homologous repeat sequences. However, it contains one major repeat region and 13 copies of a single 73–77 bp imperfect palindrome.
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