1887

Abstract

Bacteriophages ΦeiAU and ΦeiDWF are lytic to the catfish pathogen () . The host factors that modulate phage–host interactions have not been described previously. This study identified eleven unique host factors essential for phage infection by screening a transposon mutagenized library of two strains for phage-resistant mutants. Two mutants were isolated with independent insertions in the gene that encodes a putative outer membrane porin. Phage binding and efficiency of plaquing assays with . EILO, its mutant and a complemented mutant demonstrated that OmpLC serves as a receptor for phage ΦeiAU and ΦeiDWF adsorption. Comparison of translated OmpLCs from 15 strains with varying degrees of phage susceptibility revealed that amino acid variations were clustered on the predicted extracellular loop 8 of OmpLC. Deletion of loop 8 of OmpLC completely abolished phage infectivity in . Site-directed mutagenesis and transfer of modified genes to complement the mutants demonstrated that changes in sequences affect the degree of phage susceptibility. Furthermore, strain Alg-08-183 was observed to be resistant to ΦeiAU, but phage progeny could be produced if phage DNA was electroporated into this strain. A host-range mutant of ΦeiAU, ΦeiAU-183, was isolated that was capable of infecting strain Alg-08-183 by using OmpLC as a receptor for adsorption. The results of this study identified host factors required for phage infection and indicated that OmpLC is a principal molecular determinant of phage susceptibility in this pathogen.

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2012-02-01
2019-11-16
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