Genome Sequences of Gordonia rubripertincta Bacteriophages Jellybones and NHagos

ABSTRACT Jellybones and NHagos are bacteriophages that were identified in the host bacterium Gordonia rubripertincta NRRL B-16540. Jellybones has a direct terminal repeat and was assigned to the CS2 subcluster with a length of 77,514 bp. NHagos is circularly permuted and was assigned to the DR cluster with a length of 59,580 bp.

Complete Genome Sequence of Escherichia coli Myophage Mansfield

Mansfield is a PB1-like Escherichia bacteriophage with a 68,120-bp genome and a predicted 3,673-bp direct terminal repeat. This myophage encodes 105 proteins, for which 32 functions were predicted.

Complete Genomic Sequence of the Virulent Salmonella Bacteriophage SP6

ABSTRACT We report the complete genome sequence of enterobacteriophage SP6, which infects Salmonella enterica serovar Typhimurium. The genome contains 43,769 bp, including a 174-bp direct terminal repeat. The gene content and organization clearly place SP6 in the coliphage T7 group of phages, but there is ∼5 kb at the right end of the genome that is not present in other members of the group, and the homologues of T7 genes 1.3 through 3 appear to have undergone an unusual reorganization. Sequence analysis identified 10 putative promoters for the SP6-encoded RNA polymerase and seven putative rho-independent terminators. The terminator following the gene encoding the major capsid subunit has a termination efficiency of about 50% with the SP6-encoded RNA polymerase. Phylogenetic analysis of phages related to SP6 provided clear evidence for horizontal exchange of sequences in the ancestry of these phages and clearly demarcated exchange boundaries; one of the recombination joints lies within the coding region for a phage exonuclease. Bioinformatic analysis of the SP6 sequence strongly suggested that DNA replication occurs in large part through a bidirectional mechanism, possibly with circular intermediates.