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Characterization and genome analysis of G1 sub-cluster mycobacteriophage Lang.
Infection, Genetics and Evolution 2023 Februrary 16
Phage therapy is revitalized as an alternative to antibiotics therapy against antimicrobials resistant pathogens. Mycobacteriophages are genetically diverse viruses that can specifically infect Mycobacterium genus including Mycobacterium tuberculosis and Mycobacterium smegmatis. Here, we isolated and annotated the genome of a mycobacteriophage Lang, a temperate mycobacteriophage isolated from the soil of Hohhot, Inner Mongolia, China, by using Mycolicibacterium smegmatis mc2 155 as the host. It belongs to the Siphoviridae family of Caudovirales as determined by transmission electron microscopy. The morphological characteristics and certain biological properties of the phage were considered in detail. Phage Lang genomes is 41,487 bp in length with 66.85% GC content and encodes 60 putative open reading frames and belongs to the G1 sub-cluster. Genome annotation indicated that genes for structure proteins, assembly proteins, replications/transcription and lysis of the host are present in function clucters. The genome sequence of phage Lang is more than 95% similar to that of mycobacteriophage Grizzly and Sweets, differing in substitutions, insertions and deletions in Lang. One-step growth curve revealed that Lang has a latent period of 30 min and a outbreak period of 90 min. The short latent period and rapid outbreak mark the unique properties of phage Lang, which can be another potential source for combating M. tuberculosis.
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