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pubmed-article:9079892pubmed:abstractTextSynthesis of chitin oligosaccharides by NodC is the first committed step in the biosynthesis of rhizobial lipochitin oligosaccharides (LCOs). The distribution of oligosaccharide chain lengths in LCOs differs between various Rhizobium species. We expressed the cloned nodC genes of Rhizobium meliloti, R. leguminosarum bv. viciae, and R. loti in Escherichia coli. The in vivo activities of the various NodC proteins differed with respect to the length of the major chitin oligosaccharide produced. The clearest difference was observed between strains with R. meliloti and R. loti NodC, producing chitintetraose and chitinpentaose, respectively. In vitro experiments, using UDP-[14C]GlcNAc as a precursor, show that this difference reflects intrinsic properties of these NodC proteins and that it is not influenced by the UDP-GlcNAc concentration. Analysis of oligosaccharide chain lengths in LCOs produced by a R. leguminosarum bv. viciae nodC mutant, expressing the three cloned nodC genes mentioned above, shows that the difference in oligosaccharide chain length in LCOs of R. meliloti and R. leguminosarum bv. viciae is due only to nodC. The exclusive production of LCOs which contain a chitinpentaose backbone by R. loti strains is not due to NodC but to end product selection by Nod proteins involved in further modification of the chitin oligosaccharide. These results indicate that nodC contributes to the host specificity of R. meliloti, a conclusion consistent with the results of several studies which have shown that the lengths of the oligosaccharide backbones of LCOs can strongly influence their activities on host plants.lld:pubmed
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pubmed-article:9079892pubmed:dateRevised2010-9-10lld:pubmed
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pubmed-article:9079892pubmed:articleTitleRhizobium nodulation protein NodC is an important determinant of chitin oligosaccharide chain length in Nod factor biosynthesis.lld:pubmed
pubmed-article:9079892pubmed:affiliationInstitute of Molecular Plant Sciences, Leiden University, The Netherlands. kamst@rulsfb.leidenuniv.nllld:pubmed
pubmed-article:9079892pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9079892pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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