1887

Abstract

The nucleotide sequence of the DNA genome of 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 nucleopolyhedrovirus (AcMNPV), whereas 108 and 98 are homologous to genes of GV (XcGV) and 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 , the major budded virus glycoprotein gene in some nucleopolyhedroviruses, and , involved in DNA replication. However, the CpGV genome encodes the large and small subunits of ribonucleotide reductase, three inhibitor of apoptosis () 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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2001-10-01
2020-07-10
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