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The composition of Bdellovibrio bacteriovorus lipopolysaccharide (LPS) was determined for cells grown axenically and intraperiplasmically on Escherichia coli or Pseudomonas putida. The LPS of axenically grown bdellovibrios contained glucose and fucosamine as the only detectable neutral sugar and amino sugar, and nonadecenoic acid (19:1) as the predominant fatty acid. Additional fatty acids, heptose, ketodeoxyoctoic acid, and phosphate were also detected. LPS from bdellovibrios grown intraperiplasmically contained components characteristic of both axenically grown bdellovibrios and the substrate cells. Substrate cell-derived LPS fatty acids made up the majority of the bdellovibrio LPS fatty acids and were present in about the same proportions as in the substrate cell LPS. Glucosamine derived from E. coli LPS amounted to about one-third of the hexosamine residues in intraperiplasmically grown bdellovibrio LPS. However, galactose, characteristic of the E. coli outer core and O antigen, was not detected in the bdellovibrio LPS, suggesting that only lipid A components of the substrate cell were incorporated. Substrate cell-derived and bdellovibrio-synthesized LPS materials were conserved in the B. bacteriovorus outer membrane for at least two cycles of intraperiplasmic growth. When bdellovibrios were grown on two different substrate cells successively, lipid A components were taken up from the second while the components incorporated from the lipid A of the first were conserved in the bdellovibrio LPS. The data show that substrate cell lipid A components were incorporated into B. bacteriovorus lipid A during intraperiplasmic growth with little or no change, and that these components, fatty acids and hexosamines, comprised a substantial portion of bdellovibrio lipid A.

Incorporation of Substrate Cell Lipid A Components into the Lipopolysaccharide of Intraperiplasmically Grown Bdellovibrio bacteriovorus