Abstract
The novel lipochitin oligosaccharide (LCOs) structures produced by Rhizobium etli KIM5s were characterized using a nanoHPLC reverse-phase system coupled to an ion-trap mass spectrometer. This technique was shown to be more sensitive for structural elucidation of LCOs than previously used mass spectrometric methods. The structures of the LCOs of R. etli KIM5s, the majority containing six monosaccharide residues, differed from those synthesized by all other rhizobia analyzed to date. In addition, novel structures in which the chitin backbone was deacetylated at one or more GlcNAc moieties were found as minor compounds. The difference in host range of this strain compared to that of other known bean microsymbionts is discussed.
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