Infection of a Chlorella-like alga with the virus PBCV-1: Transcriptional studies

Anne M. Schuster, Lois Girton, Dwight E. Burbank, James L. Van Etten

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


Infection of the unicellular, eukaryotic Chlorella-like green alga NC64A by the large dsDNA containing virus PBCV-1 immediately reduced host RNA synthesis. Chloroplast rRNAs, but not cytosolic rRNAs, were degraded following viral infection. Northern blot analysis utilizing four cloned fragments of PBCV-1 DNA as probes, which represent about 12% of the viral genome, revealed several properties of PBCV-1 transcription: (i) A few viral transcripts were detected within 5 min after infection. (ii) Each PBCV-1 DNA clone hybridized to both early and late transcripts which implies that early and late genes are dispersed throughout the viral genome. (iii) The transition from early to late transcription occurred between 40 and 60 min after infection coincident with the onset of viral DNA synthesis. (iv) Three of the four DNA clones hybridized to transcripts which additively were larger than the corresponding DNA probe. This could reflect RNA processing, presence of overlapping genes, or transcription from both DNA strands. (v) A few, but not all, early transcripts were synthesized in the presence of cycloheximide. This suggests that the virus either carries in its own RNA polymerase or uses a host RNA polymerase for very early viral transcription and that synthesis of additional, later transcripts depends on translation of an early gene product(s).

Original languageEnglish (US)
Pages (from-to)181-189
Number of pages9
Issue number1
StatePublished - Jan 15 1986

ASJC Scopus subject areas

  • Virology


Dive into the research topics of 'Infection of a Chlorella-like alga with the virus PBCV-1: Transcriptional studies'. Together they form a unique fingerprint.

Cite this