Analysis of phage resistance in Staphylococcus aureus SA003 reveals different binding mechanisms for the closely related Twort-like phages ɸSA012 and ɸSA039
We have previously generated strains of Staphylococcus aureus SA003 resistant to its specific phage ɸSA012 through a long-term coevolution experiment. However, the DNA mutations responsible for the phenotypic change of phage resistance are unknown. Whole-genome analysis revealed eight genes that acquired mutations: six point mutations (five missense mutations and one nonsense mutation) and two deletions. Complementation of the phage-resistant strains by the wild-type alleles showed that five genes were linked to phage adsorption of ɸSA012, and two mutated host genes were linked to the inhibition of post-adsorption. Unlike ɸSA012, infection by ɸSA039, a close relative of ɸSA012, onto early coevolved phage-resistant SA003 (SA003R2) was impaired drastically. Here, we identified that ɸSA012 and ɸSA039 adsorb to the cell surface S. aureus SA003 through a different mechanism. ɸSA012 requires the backbone of wall teichoic acids (WTA), while ɸSA039 requires both backbone and the β-GlcNAc residue. In silico analysis of the ɸSA039 genome revealed that several proteins in the tail and baseplate region were different from ɸSA012. The difference in tail and baseplate proteins might be the factor for specificity difference between ɸSA012 and ɸSA039.
KeywordsStaphylococcus aureus Twort-like phage Phage-resistance mechanism Bacteriophage receptor Bacteriophage therapy
We would like to thank Professor Takehiko Itoh (School of Life Science and Technology, Tokyo Institute of Technology) for allowing us to use NGS analysis in his lab. We also thank Professor Masaaki Wachi (School of Life Science and Technology, Tokyo Institute of Technology) for his useful advice.
This work was funded by the Ministry of Education, Culture, Sport, Science and Technology of Japan (Grant number: 24246133).
Compliance with ethical standards
Conflict of interest
All authors declare that there is no conflict of interest in this article.
This article does not contain any studies with human participants and animals performed by any of the authors.
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