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. 1987 Oct;61(10):3048–3057. doi: 10.1128/jvi.61.10.3048-3057.1987

Overlapping sets of viral RNAs reflect the array of polypeptides in the EcoRI J and N fragments (map positions 81.2 to 85.0) of the Autographa californica nuclear polyhedrosis virus genome.

C Oellig, B Happ, T Müller, W Doerfler
PMCID: PMC255879  PMID: 3041026

Abstract

In several parts of the Autographa californica nuclear polyhedrosis virus (AcNPV) genome, nested sets of overlapping RNAs with common 3' or 5' termini have been recognized. In the present report, the pattern of viral transcription and the arrangement of viral gene products in the region of 81.2 to 85.0 map units were investigated. In this segment of the AcNPV genome, at least nine size classes of viral RNA were identified which ranged in size from 1.3 kilobases (kb) to 4.6 kb and exhibited common 3' termini. The detailed restriction map and the nucleotide sequence of this part of the AcNPV genome were determined. Computer analyses revealed several open reading frames (ORFs) on the rightward-transcribed strand with potential TATA and CAAT signals preceding many of the potential ORFs and the 5' termini of some of the mapped RNAs. The leftward-transcribed strand was devoid of major ORFs. The presumptive polypeptides encoded by the larger ORFs ranged in size from 11.3 to 55.6 kilodaltons (kDa). The amino acid sequence of the presumptive polypeptide encoded by ORF3, a 33.6-kDa molecule, exhibited an unusual, clustered 16-fold repeat of the dipeptide arginine-serine in a protein that showed an overall preponderance of basic amino acids. The results of in vitro translation experiments with hybrid-selected RNAs homologous to internal subfragments of the 81.2- to 85.0-map-unit region yielded polypeptides of approximately 28, 34 to 36, and 48 to 50 kDa, which were close in size to the lengths of the major ORFs derived from the nucleotide sequence. The localizations of individual size classes of RNAs in the 81.2- to 85.0-map-unit region of the viral genome were determined precisely at the 3' and 5' termini by S1 protection analyses. Within a sequence of eight nucleotides, all RNAs had the same 3' terminus, which lay close to multiple polyadenylation signals. The initiation sites of the nine different RNA size classes were precisely mapped. As the cap sites of the smaller RNAs (less than 1.8 kb) were determined by S1 protection analyses, a multitude of RNA initiation sites became apparent. It was also shown that the different RNA size classes in the 81.2- to 85.0-map-unit region were detectable as early as 2 h and at least until 36 to 48 h after infection. In unselected cytoplasmic RNA, the size classes of viral RNAs specific for the EcoRI J fragment were detectable early as well as late after infection, although at early times the larger RNAs were detectable in smaller amounts.(ABSTRACT TRUNCATED AT 400 WORDS)

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Selected References

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