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. 1987 May;61(5):1457–1465. doi: 10.1128/jvi.61.5.1457-1465.1987

Intercistronic as well as terminal sequences are required for efficient amplification of brome mosaic virus RNA3.

R French, P Ahlquist
PMCID: PMC254123  PMID: 3573144

Abstract

The genome of brome mosaic virus (BMV) is divided among messenger polarity RNA1, RNA2, and RNA3 (3.2, 2.9, and 2.1 kilobases, respectively). cis-Acting sequences required for BMV RNA amplification were investigated with RNA3. By using expressible cDNA clones, deletions were constructed throughout RNA3 and tested in barley protoplasts coinoculated with RNA1 and RNA2. In contrast to requirements for 5'- and 3'-terminal noncoding sequences, either of the two RNA3 coding regions can be deleted individually and both can be simultaneously inactivated by N-terminal frameshift mutations without significantly interfering with amplification of RNA3 or production of its subgenomic mRNA. However, simultaneous major deletions in both coding regions greatly attenuate RNA3 accumulation. RNA3 levels can be largely restored by insertion of a heterologous, nonviral sequence in such mutants, suggesting that RNA3 requires physical separation of its terminal domains or a minimum overall size for normal replication or stability. Unexpectedly, deletions in a 150-base segment of the intercistronic noncoding region drastically reduce RNA3 accumulation. This segment contains a sequence element homologous to sequences found near the 5' ends of BMV RNA1 and RNA2 and in analogous positions in the three genomic RNAs of the related cucumber mosaic virus, suggesting a possible role in plus-strand synthesis.

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