Abstract
The double-stranded RNA genome of Bombyx mori cytoplasmic polyhedrosis virus (CPV) was converted to double-stranded DNA and cloned into plasmid pBR322. The complete nucleotide sequence of cloned genome segment 10, which encodes virus polyhedrin polypeptide, was determined. The CPV polyhedrin gene consists of 942 based pairs and possesses a long open reading frame that codes for a polypeptide of 248 amino acids (molecular weight, 28,500), consistent with an apparent molecular weight of 28,000 previously determined for purified polyhedrin. No sequence homology was found between CPV polyhedrin and polyhedrins from several nuclear polyhedrosis viruses. In addition to the polyhedrin gene, we completed the sequence analysis of a small deletion mutant gene derived from the polyhedrin gene. This mutant gene consists of two subset domains of the polyhedrin gene, i.e., the 5'-terminal 121 base pairs and the 3'-terminal 200 base pairs. An in vitro transcription demonstrated that the small mutant gene is transcribed by virion-associated RNA polymerases. These data confirm the importance of CPV terminal sequences in virus genome replication.
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