RRC ID 30988
Author Hashimoto M, Tanishita Y, Suda Y, Murakami E, Nagata M, Kucho K, Abe M, Uchiumi T.
Title Characterization of nitric oxide-inducing lipid A derived from Mesorhizobium loti lipopolysaccharide.
Journal Microbes Environ
Abstract Mesorhizobium loti is a member of the rhizobia and forms nitrogen-fixing symbioses with several Lotus species. Recently, it was reported that M. loti bacterial cells and their lipopolysaccharide (LPS) preparations transiently induced nitric oxide (NO) production in the roots of L. japonicus. We subsequently found that polysaccharides and the lipid A moiety were responsible for this NO induction. In this study, we elucidated the chemical structure of M. loti lipid A and characterized its NO-inducing activity in response to structural modifications. M. loti LPS were partially hydrolyzed with hydrazine or aqueous hydrofluoric acid to obtain O-deacylated or dephosphorylated LPS, respectively. The untreated and treated LPS fractions were subjected to weak acid hydrolysis to obtain lipid A fractions. The chemical structure of M. loti lipid A was elucidated by chemical composition analysis, MALDI-TOF-MS, and NMR spectra to be P-4-β-GlcNN(1-6)α-GlcNN(1-1)α-GalA, in which positions 2 and 3 of β-GlcNN are substituted for 3-acyloxy-fatty amides, and positions 2 and 3 of α-GlcNN are substituted for 3OH-fatty amides. The partial hydrolysis of lipid A appeared to reduce its NO-inducing activity. These results suggest that L. japonicus root cells recognize the lipid A structure as a means of controlling NO production.
Volume 27(4)
Pages 490-6
Published 2012-1-1
DOI 10.1264/jsme2.me12103
PMID 23059724
PMC PMC4103559
MeSH Lipid A / chemistry Lipid A / metabolism* Lipopolysaccharides / chemistry Lipopolysaccharides / metabolism* Lotus / metabolism* Lotus / microbiology Mesorhizobium / metabolism* Nitric Oxide / biosynthesis* Nitric Oxide / metabolism Nuclear Magnetic Resonance, Biomolecular Plant Roots / metabolism Plant Roots / microbiology Rhizobium / metabolism Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization Symbiosis
IF 2.575
Times Cited 5
Lotus / Glycine L. japonicus MG-20