Abstract
Francisella novicida (U112), a close relative of the highly virulent bacterium F. tularensis, is known to produce a lipopolysaccharide that is significantly different in biological properties from the LPS of F. tularensis. Here we present the results of the structural analysis of the F. novicida LPS core part, which is found to be similar to that of F. tularensis, differing only by one additional α-Glc residue: where R is an O-chain, linked via a β-bacillosamine (2,4-diamino-2,4,6-trideoxyglucose) residue. The lipid part of F. novicida LPS contains no phosphate substituent and apparently has a free reducing end, a feature also noted in F. tularensis LPS.
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