A region including the 4 kb dIII M fragment of the multicapsid nuclear polyhedrosis virus (MNPV) of (OpMNPV) genome was sequenced, transcriptionally mapped, and compared to the homologous region in the MNPV of (AcMNPV). Five open reading frames (ORFs) oriented in the same direction were identified and were found to be expressed at late times post-infection. The mRNAs from the five ORFs were found to coterminate at a single site downstream of ORF 5. The conserved late gene promoter/mRNA start site sequence ( TAAG) was present upstream of all the ORFs, but did not appear to be the major site of mRNA initiation for two of the ORFs as determined by primer extension analysis. These data indicated that use of this signal for transcriptional initiation may vary between different ORFs. The predicted amino acid sequences for the five ORFs of AcMNPV and OpMNPV were compared and amino acid homologies of 26 to 72% were observed. The comparison revealed a number of major differences in the genomes of the two viruses. A putative transposable element of 634 nucleotides was found to be inserted into the previously reported AcMNPV ORF 1 sequence. In addition, it was found that a region corresponding to the 4 kb dIII K/RI S/5 region of AcMNPV was not present in the OpMNPV genome.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error