title: Rhizobium leguminosarum bv. trifolii produces lipo-chitin oligosaccharides with nodE-dependent highly unsaturated fatty acyl moieties. An electrospray ionization and collision-induced dissociation tandem mass spectrometric study.
abstract: The lipo-chitin oligosaccharides (LCO) or nodulation factors synthesized by Rhizobium leguminosarum bv. trifolii were analyzed using positive mode fast atom bombardment and positive and negative mode electrospray ionization mass spectrometry. From their mass spectrometric behavior it is clearly possible to distinguish between the [M + Na]+ pseudomolecular ion of the nodE-independent molecule IV(C18:1,Ac) and the [M + H]+ pseudomolecular ion of the nodE-dependent molecule IV(C20:4,Ac), although they both have the same mass value. The results unequivocally show that the bacterial strain investigated produces nodE-dependent LCOs with highly unsaturated fatty acyl moieties. We further demonstrate that the interpretation of the mass spectrometric data by Philip-Hollingsworth et al. (Philip-Hollingsworth, S., Orgambide, G. G., Bradford, J. J., Smith, D. K., Hollingsworth, R. I., and Dazzo, F. B. (1995) J. Biol. Chem. 270, 20968) is incorrect and that their data do not contradict our hypothesis that the nodE gene determines the host specificity of R. leguminosarum bv. trifolii.
authors.affiliation: Department of Mass Spectrometry, Utrecht University, F.A.F.C. Went Gebouw, Sorbonnelaan 16, 3584 CA Utrecht, The Netherlands.
authors.forename: K M
authors.initials: KM
authors.lastname: van der Drift
authors.forename: H P
authors.initials: HP
authors.lastname: Spaink
authors.forename: G V
authors.initials: GV
authors.lastname: Bloemberg
authors.forename: A A
authors.initials: AA
authors.lastname: van Brussel
authors.forename: B J
authors.initials: BJ
authors.lastname: Lugtenberg
authors.forename: J
authors.initials: J
authors.lastname: Haverkamp
authors.forename: J E
authors.initials: JE
authors.lastname: Thomas-Oates
mesh_terms: D000217:Acyltransferases; D001426:Bacterial Proteins / Q000378:metabolism*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002686:Chitin / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D005231:Fatty Acids, Unsaturated / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000096:biosynthesis* / Q000737:chemistry / Q000302:isolation & purification; D008565:Membrane Proteins; D012231:Rhizobium / Q000378:metabolism*; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D001426:Bacterial Proteins; D005231:Fatty Acids, Unsaturated; D008070:Lipopolysaccharides; D008565:Membrane Proteins; C023023:lipid-linked oligosaccharides; C061842:NodE protein, Rhizobium; D002686:Chitin; D000217:Acyltransferases