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Mol Gen Genet. 1994 Oct 28;245(2):160-6.

Sequencing and analysis of the cos region of the lactococcal bacteriophage c2.

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New Zealand Dairy Research Institute, Palmerston North.


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.

[Indexed for MEDLINE]

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