Bacterial strains used in this work.

aThese strains are attenuated due to a lack of pigmentation/siderophore yersiniabactin production genes and/or of pCD1 plasmid encoding type III secretion system and virulence Yop proteins (for review, see [1]). bY. pestis CO92 LPS gene designations are given according to [50], [51]. cClones with a pBAD vector (Invitrogen, Carlsbad, California, USA) were used in trans-complementation experiments to exclude a possible impact of pBAD on LPS expression and phage susceptibility. dPlasmid pUTKm was used as a source of kanamycin cassette. eDepartment of Molecular and Cell Biology, University of California, Berkeley, California, USA.