Discovery of the tail tube gene of bacteriophage Mu and sequence analysis of the sheath and tube genes.

The nucleotide sequence was determined for 2.75 kbp of phage Mu DNA encoding the contractile tail sheath protein L. N-terminal sequence analysis of Mu tail tube and sheath proteins identified the open reading frame just downstream of gene L as the tube gene. This clustering and order of the sheath and tube genes appear to be common among the myoviridae. Database homology searches revealed high similarity between the Mu sheath and tube proteins and two proteins in a Haemophilus influenzae Mu-like prophage, suggesting that they are the sheath and tube proteins of that prophage.

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