4. Strains with IS insertions in OCL1 produce truncated
LOS structures
The SMAL and MG1 controls and the A91 and 3208 wild
type strains produced LOS bands of the same size (indicated
by the dotted line in Fig. 2A). The size of the LOS of the A74
mutant, which represents the ten GC2 isolates that carry
OCL1d, is clearly less than that of the controls (Fig. 2A),
including the A91 isogenic wild type strain (Fig. 2B). Hence,
the ISAba1 insertion in ghy in OCL1d (Fig. 1) directly affects
LOS synthesis. The LOS of D1 is also deeply truncated, and
the band is only slightly larger than that of A74 (Fig. 2A). The
size of the LOS of the GC1 mutant, D78, is also reduced,
though only slightly, suggesting that the insertion of ISAba23
in gtrOC6 affects only one of the final linkages in OC1.