In this study, we isolated a lytic phage (vB_PaeP_ASP23) from the sewage of a mink farm, characterized its complete genome and analyzed the function of its putative and . Morphological characterization and genome annotation showed that phage ASP23 belonged to the family genus , and it had a latent period of 10 min and a burst size of 140 pfu/infected cell. In minks challenged with , phage ASP23 significantly reduced bacterial counts in the liver, lung, and blood. The whole-genome sequencing showed that its genome was a 42,735-bp linear and double-stranded DNA (dsDNA), with a G + C content of 62.15%. Its genome contained 54 predicted open reading frames (ORFs), 25 of which had known functions. The lysin of phage ASP23 (LysASP), in combination with EDTA, showed high lytic activity against L64. The holin of phage ASP23 was synthesized by M13 phage display technology, to produce recombinant phages (HolASP). Though HolASP exhibited a narrow lytic spectrum, it was effective against and . However, these two bacteria were insensitive to LysASP. The findings highlight the potential of phage ASP23 to be used in the development of new antibacterial agents.
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http://dx.doi.org/10.3389/fmicb.2023.1093668 | DOI Listing |
Front Microbiol
March 2023
College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, Shandong, China.
J Biol Chem
April 1999
the Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, Texas 77555-1071, USA.
The repair of UV light-induced cyclobutane pyrimidine dimers can proceed via the base excision repair pathway, in which the initial step is catalyzed by DNA glycosylase/abasic (AP) lyases. The prototypical enzyme studied for this pathway is endonuclease V from the bacteriophage T4 (T4 bacteriophage pyrimidine dimer glycosylase (T4-pdg)). The first homologue for T4-pdg has been found in a strain of Chlorella virus (strain Paramecium bursaria Chlorella virus-1), which contains a gene that predicts an amino acid sequence homology of 41% with T4-pdg.
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