Sequencing and analysis of the cos region of the lactococcal bacteriophage c2 |
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Authors: | Mark W. Lubbers Lawrence J. H. Ward Tom P. J. Beresford Brion D. W. Jarvis Audrey W. Jarvis |
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Affiliation: | 1. New Zealand Dairy Research Institute, Private Bag, 11 029, Palmerston North, New Zealand 2. Department of Microbiology and Genetics, Massey University, Palmerston North, New Zealand
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Abstract: | The cohesive termini of the DNA genome of the lactococcal bacteriophage c2 were directly sequenced and appeared to be complementary, non-symmetrical, 9-nucleotide single-stranded, 3′ extended DNAs, with the following sequence: 5′-GTTAGGCTT-3′ 3′-CAATCCGAA-5′. DNA located on either side of the cohesive ends was sequenced and several repeats and a region with the potential for a DNA bend were found. Previously sequenced cos regions of 13 other bacteriophages were also examined for similar sequence features. All of the bacteriophages from gram-positive hosts had 3′ extended DNA termini, in contrast to the bacteriophages from gram-negative hosts, which had 5′ extended DNA termini. All bacteriophages had a region of dyad symmetry close to the cohesive termini. A 7.3 kb DNA fragment of the c2 genome containing the cos sequences was cloned; transduction experiments demonstrated that these cloned sequences could act as a substrate for packaging enzymes of phage c2. |
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