Isolation and characterization of bacteriophage NTR1 infectious for Nocardia transvalensis and other Nocardia species.

We describe here the isolation and characterization of the bacteriophage, NTR1 from activated sludge. This phage is lytic for Nocardia transvalensis, Nocardia brasiliensis and Nocardia farcinica. NTR1 phage has a genome sequence of 65,275 bp in length, and its closest match is to the Skermania piniformis phage SPI1 sharing over 36% of its genome. The phage belongs to the Siphoviridae family, possessing a long non-contractile tail and icosahedral head. Annotation of the genome reveals 97 putative open reading frames arranged in the characteristic modular organization of Siphoviridae phages and contains a single tRNA-Met gene.