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An activator of transcription regulates phage TP901-1 late gene expression

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Authors:
  • Brøndsted, Lone ;
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    Department of Microbiology, Technical University of Denmark
  • Pedersen, Margit ;
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    Department of Systems Biology, Technical University of Denmark
  • Hammer, Karin
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    Department of Biotechnology and Biomedicine, Technical University of Denmark
DOI:
10.1128/AEM.67.12.5626-5633.2001
Abstract:
A promoter active in the late phase of the lytic cycle of lactococcal bacteriophage TP901-1 has been identified. The promoter is tightly regulated and requires the product of the phage TP901-1 orf29 for activity. A deletion analysis of the late promoter region showed that a fragment as small as 99 bp contains both the promoter and the region necessary for activation by ORF29. The transcriptional start site of the promoter was identified by primer extension to position 13073 on the TP901-1 genome, thus located 87 bp downstream of orf29 in a 580-bp intergenic region between orf29 and orf30. Furthermore, the region located -85 to -61 bp upstream of the start site was shown to be necessary for promoter activity. During infection, the transcript arising from the late promoter is fully induced at 40 min postinfection, and our results suggest that a certain level of ORF29 must he reached in order to activate transcription of the promoter. Several lactococcal bacteriophages encode ORF29 homologous proteins, indicating that late transcription may be controlled by a similar mechanism in these phages. With the identification of this novel regulator, our results suggest that within the P335 group of lactococcal phages at least two regulatory systems controlling transcription in the late stage of infection exist.
Type:
Journal article
Language:
English
Published in:
Applied and Environmental Microbiology, 2001, Vol 67, Issue 12, p. 5626-5633
Keywords:
gram
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2001
Scientific Level:
Scientific
ID:
990214

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