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Volume 140, Issue 9

Temporal transcription map of the bacteriophage sk1 Free

Abstract

Bacteriophage sk1 is a small isometric-headed lytic phage that infects . The phage has a linear double-stranded DNA genome of 28 kbp, with cohesive ends. RNA was prepared from phage-infected cells harvested at various intervals after infection, and the RNA molecules were resolved by E1ectrophoresis. Northern blots of these gels were hybridized with sk1 DNA probes and the results obtained from these experiments, together with the results of primer extension analyses, enabled a transcription map of the phage genome to be prepared. Three classes of phage transcripts, designated as early, middle or late based on their time of appearance, were detected. Seven partially overlapping early transcripts were detected; these were transcribed from a 10 kbp region of the phage. The nine middle transcripts were derived from a 2 kbp region, limited by at one end and the start of the early transcripts at the other. The early and middle transcripts were transcribed divergently from a region mapping at 26 kbp on the sk1 physical map. The four late transcripts were derived from a 16 kbp region of the phage limited at one end by . The late transcripts were transcribed in the opposite direction to the early transcripts and three of the late transcripts terminated in the same region of the phage genome as three of the early transcripts.

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  • Published Online:
Keyword(s): Lactococcus lactis , small isometric-headed bacteriophage sk1 and transcription map
© Society for General Microbiology 1994
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1994-09-01
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Temporal transcription map of the Lactococcus lactis bacteriophage sk1
Microbiology 140, 2251 (1994); https://doi.org/10.1099/13500872-140-9-2251
/content/journal/micro/10.1099/13500872-140-9-2251
/content/journal/micro/10.1099/13500872-140-9-2251
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