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. 1991 Dec;65(12):6516–6527. doi: 10.1128/jvi.65.12.6516-6527.1991

Identification, cloning, and sequencing of a fragment of Amsacta moorei entomopoxvirus DNA containing the spheroidin gene and three vaccinia virus-related open reading frames.

R L Hall 1, R W Moyer 1
PMCID: PMC250701  PMID: 1942245

Abstract

Entomopoxvirus virions are frequently contained within crystalline occlusion bodies, which are composed of primarily a single protein, spheroidin, which is analogous to the polyhedrin protein of baculovirus. The spheroidin gene of Amsacta moorei entomopoxvirus was identified following the microsequencing of polypeptides generated from cyanogen bromide treatment of spheroidin and the subsequent synthesis of oligonucleotide hybridization probes. DNA sequencing of a 6.8-kb region of DNA containing the spheroidin gene showed that the spheroidin protein is derived from a 3.0-kb open reading frame potentially encoding a protein of 115 kDa. Three copies of the heptanucleotide, TTTTTNT, a sequence associated with early gene transcription in the vertebrate poxviruses, and four in-frame translational termination signals were found within 60 bp upstream of the putative spheroidin gene promoter (TAAATG). The spheroidin gene promoter region contains the sequence TAAATG, which is found in many late promoters of the vertebrate poxviruses and which serves as the site of transcriptional initiation, as shown by primer extension. Primer extension experiments also showed that spheroidin gene transcripts contain 5' poly(A) sequences typical of vertebrate poxvirus late transcripts. The 92 bases upstream of the initiating TAAATG are unusually A + T rich and contain only 7 G or C residues. An analysis of open reading frames around the spheroidin gene suggests that the colinear core of "essential genes" typical of the vertebrate poxviruses is absent in A. moorei entomopoxvirus.

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Selected References

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