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Mass spectra of lipid A from the (a) K. pneumoniae B5055 parental strain, (b) vector-only K. pneumoniae B5055pBBR1MCS-5 strain and (c) mcr-1-expressing K. pneumoniae B5055pmcr-1 strain. The pEtN-modified lipid A species are shown by the arrows. (d) Structures of predominant hexa-acylated lipid A species from each strain, with the corresponding pEtN-modified species on the right with pEtN shown in the boxes.
