In recent years, antimicrobial resistance has become a major medical threat worldwide. Among these threats, the rapid increase in carbapenem-resistant Acinetobacter baumannii (CRAB) is a particularly challenging global issue in the health care setting. In this study, a novel lytic A. baumannii phage, Βϕ-R3177, infecting carbapenem-resistant A. baumannii strains was isolated from sewage samples at a hospital. The morphology of the phage as assessed by transmission electron microscopy (TEM) indicated that it belongs to the family Siphoviridae within the order Caudovirales. It has a linear double-stranded DNA genome of 47,575 bp with a G+C content of 39.83 %. Eighty open reading frames (ORFs) were predicted; however, only 14 ORFs were annotated as encoding functional proteins, while most of the ORFs encoded hypothetical proteins. Among the total ORFs of the phage genome, no toxin-related genes were detected. A bioinformatics analysis showed that the whole genome sequence of phage Βϕ-R3177 exhibited 62 % sequence similarity to that of Acinetobacter phage Βϕ-B1252, but there was no homology seen with other phages. Physiological characteristics, such as one-step growth properties, pH and temperature stability, and host cell lysis activity showed this phage has high stability and lytic activity against host bacteria and therefore has potential applicability as an antibacterial agent to control pathogens in the hospital environment.
Bibliographical noteFunding Information:
This work was supported by the BioNano Health-Guard Research Center, funded by the Ministry of Science; ICT and Future Planning (MSIP) of Korea as a Global Frontier Project (Grant Number H-GUARD_ 2014M3A6B2060509); the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology (NRF-2012R1A1A2009064); and a grant from the Brain Korea 21 PLUS Project for Medical Science, Yonsei University. We are grateful to Ms. Sori Jong for technical assistance.
© 2015, Springer-Verlag Wien.
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