A novel highly unsaturated fatty acid moiety of lipo-oligosaccharide signals determines host specificity of Rhizobium

Spaink, Herman P.; Sheeley, Douglas M.; Brussel, A. A. N. Van; Glushka, John; York, William S.; Tak, T.; Geiger, Otto; Kennedy, Eugene P.; Reinhold, Vernon N.; Lugtenberg, Ben

doi:10.1038/354125a0

Cited by 518 publications

(423 citation statements)

References 31 publications

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“…Moreover, by showing that nodule meristematic centers can be detected during the very first hours following inoculation, before infection has progressed beyond the outermost plant cells, our results suggest that the meristem is induced at a distance (35,36). During the last decade, different groups have shown that nodulating rhizobia produce lipooligosaccharidic Nod factors (18,32), which are able to induce inner cortical cell divisions (32,36) and nodule development in alfalfa (36). More shown that A. caulinodans ORS571, the strain used as an inoculant in this study, also produces lipooligosaccharidic Nod factors (21).…”

Section: Discussionmentioning

confidence: 53%

Root nodulation of Sesbania rostrata

et al. 1994

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The tropical legume Sesbania rostrata can be nodulated by Azorhizobium caulinodans on both its stem and its root system. Here we investigate in detail the process of root nodulation and show that nodules develop exclusively at the base of secondary roots. Intercellular infection leads to the formation of infection pockets, which then give rise to infection threads. Concomitantly with infection, cortical cells of the secondary roots dedifferentiate, forming a meristem which has an "open-basket" configuration and which surrounds the initial infection site. Bacteria are released from the tips of infection threads into plant cells via "infection droplets," each containing several bacteria. Initially, nodule differentiation is comparable to that of indeterminate nodules, with the youngest meristematic cells being located at the periphery and the nitrogen-fixing cells being located at the nodule center. Because of the peculiar form of the meristem, Sesbania root nodules develop uniformly around a central axis. Nitrogen fixation is detected as early as 3 days following inoculation, while the nodule meristem is still active. Two weeks after inoculation, meristematic activity ceases, and nodules then show the typical histology of determinate nodules. Thus, root nodule organogenesis in S. rostrata appears to be intermediate between indeterminate and determinate types.

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Section: Discussionmentioning

confidence: 53%

Root nodulation of Sesbania rostrata

et al. 1994

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“…Such contacts are usually between pairs of sideNodF directs the synthesis of a trans-2,trans-4,trans-6,cis-11-chain protons. However, the l~N-directed structure-determioctadecatetraenoic acid [6] which forms part of a host-specific nation strategy adopted here limits the NOEs primarily to lipo-chitin oligosaccharide signal [2]. Surprisingly, recent eviones involving at least one backbone amide proton or the dence even suggests that, besides a constitutive AcpP [39] and few contacts with sidechain -NH2s in glutamine, arginine the inducible NodF, there might be at least two additional and asparagine residues.…”

Section: ~ ] 34 Comparison Of the Structure With E Eoli Acpp Imentioning

confidence: 90%

NMR investigations of the structural properties of the nodulation protein, NodF, from Rhizobium leguminosarum and its homology with Escherichia coli acyl carrier protein

1996

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$45 of NodF). Like AcpP, the NodF protein can carry this Abstract Heteronuclear NMR methods have been used to elucidate the secondary structure and the general tertiary fold of prosthetic group [9]. However, the sequence homology outside the protein NodF from Rhizobium leguminosarum. A similarity the region near the binding site is quite low and this raises the to acyl carrier proteins of the fatty acid synthase system bad been question whether the functional similarities between AcpP and suggested by the presence of a phosphopantetheine prosthetic NodF are dictated only by this small stretch of sequence group and a short stretch of sequence homology near the homology or whether there exist other structural similarities prosthetic group attaclmlent site. NMR results suggest that the between the two proteins, perhaps between their secondary structural homology extends well beyond this region. Both structures and tertiary folds. proteins have three well-formed helices which fold in a parallelACPs from bacteria and plants have resisted detailed strucantiparallel fashion and a prosthetic group attachment site near tural work, possibly because of the presence of highly labile the beginning of the second helix, structural elements. However, a low resolution NMR struc-

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“…Some elicitors have been identified in the Rhizobium-legume symbiosis (Spaink et al, 1991). Since the different signals (chemicals) involved have to be synthesized, the relevant metabolic processes should be stimulated after contact between host and fungus.…”

Section: Introductionmentioning

confidence: 99%

Comparison of protein patterns in non‐mycorrhizal and vesicular–arbuscular mycorrhizal roots of red clover

1993

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SUMMARYA comparison of the protein content and patterns in root extracts from non-mycorrhizal and vesicular-arbuscular mycorrhizal [Glomus mosseae (Nicol. et Gerd.) Gerd. et Trappe] red clover {Trifolium pratense L.) has been made. Soluble protein content was higher in mycorrhizal than in non-mycorrhizal roots. After separation by DEAEcellulose chromatography and electrophoretic analysis, several additional polypeptides appeared in mycorrhizal extracts. In addition, it seems that one of the additional proteins was a plant-induced superoxide dismutase isozyme.

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A novel highly unsaturated fatty acid moiety of lipo-oligosaccharide signals determines host specificity of Rhizobium

Cited by 518 publications

References 31 publications

Root nodulation of Sesbania rostrata

Root nodulation of Sesbania rostrata

NMR investigations of the structural properties of the nodulation protein, NodF, from Rhizobium leguminosarum and its homology with Escherichia coli acyl carrier protein

Comparison of protein patterns in non‐mycorrhizal and vesicular–arbuscular mycorrhizal roots of red clover

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