Transduction of plant signal molecules by the <i>Rhizobium</i> NodD proteins

Györgypál, Zoltán; Kiss, G. B.; Kondorosi, Ádám

doi:10.1002/bies.950131106

Cited by 48 publications

(23 citation statements)

References 49 publications

(13 reference statements)

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“…NodD proteins belong to a family of LysR-like transcriptional regulators that bind to highly conserved 47-bp DNA motifs (nod boxes) found in the promoter regions of many nodulation loci (81,227). Although NodD proteins bind to nod boxes even in the absence of an inducer, flavonoids are generally required for the expression of nod genes (81,82,101,110). Thus, NodD acts both as a sensor of the plant signal and as an activator of transcription of nod loci (236).…”

Section: Flavonoids and Regulation Of Nodulation Genesmentioning

confidence: 99%

Molecular Basis of Symbiotic Promiscuity

Perret

Staehelin

Broughton

2000

Microbiol Mol Biol Rev

877

630

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SUMMARY Eukaryotes often form symbioses with microorganisms. Among these, associations between plants and nitrogen-fixing bacteria are responsible for the nitrogen input into various ecological niches. Plants of many different families have evolved the capacity to develop root or stem nodules with diverse genera of soil bacteria. Of these, symbioses between legumes and rhizobia (Azorhizobium, Bradyrhizobium, Mesorhizobium, and Rhizobium) are the most important from an agricultural perspective. Nitrogen-fixing nodules arise when symbiotic rhizobia penetrate their hosts in a strictly controlled and coordinated manner. Molecular codes are exchanged between the symbionts in the rhizosphere to select compatible rhizobia from pathogens. Entry into the plant is restricted to bacteria that have the “keys” to a succession of legume “doors”. Some symbionts intimately associate with many different partners (and are thus promiscuous), while others are more selective and have a narrow host range. For historical reasons, narrow host range has been more intensively investigated than promiscuity. In our view, this has given a false impression of specificity in legume-Rhizobium associations. Rather, we suggest that restricted host ranges are limited to specific niches and represent specialization of widespread and more ancestral promiscuous symbioses. Here we analyze the molecular mechanisms governing symbiotic promiscuity in rhizobia and show that it is controlled by a number of molecular keys.

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Section: Flavonoids and Regulation Of Nodulation Genesmentioning

confidence: 99%

Molecular Basis of Symbiotic Promiscuity

Perret

Staehelin

Broughton

2000

Microbiol Mol Biol Rev

877

630

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“…Hence, these genes are not interchangeable between different species. The nodD gene, which can be present in up to three copies, encodes a regulatory protein that activates transcription of the other nod genes, but only in the presence of specific plant-produced flavonoids (1,2). In the case of Bradyrhizobium japonicum these nod geneinducing flavonoids are isoflavones (e.g., genistein or daidzein) (3).…”

mentioning

confidence: 99%

A 2-O-methylfucose moiety is present in the lipo-oligosaccharide nodulation signal of Bradyrhizobium japonicum.

Sanjuán

Carlson

Spaink

et al. 1992

Proc. Natl. Acad. Sci. U.S.A.

191

101

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A 2-0-methylfucose moiety is present in the lipo-oligosaccharide ABSTRACTBradyrhizobiumjaponicum is a soil bacterium that forms nitrogen-fixing nodules on the roots of the agronomically important legume soybean. Microscopic observation of plant roots showed that butanol extract of B. japonicum strain USDA110 cultures induced for nod gene expression elicited root hair deformation, an early event in the modulation process. The metabolite produced by B. japonicum responsible for root hair deformation activity was purified. Chemical analysis of the compound revealed it to be a pentasaccharide of N-acetylglucosamine modified by a Ci8:, fatty acyl chain at the

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“…The nod genes are responsible for the synthesis of the nod factors (lipochitin-oligosaccharides) that are receptors for the plant favonoid signal. [14][15][16][17][18] The nodD is a regulatory gene of the operon nodABC [19][20][21] whose genes are determinants of the host range. [22][23][24][25][26][27] The nifH gene codifies a subunit of the enzyme nitrogenase involved in nitrogen fixation and is carried by rhizobia but also by free-living nitrogen fixers.…”

Section: Taxonomy Of Rhizobia Between 1974 and 2000mentioning

confidence: 99%

Taxonomy of Bacteria Nodulating Legumes

2009

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Over the years, the term "rhizobia" has come to be used for all the bacteria that are capable of nodulation and nitrogen fixation in association with legumes but the taxonomy of rhizobia has changed considerably over the last 30 year. Recently, several nonrhizobial species belonging to alpha and beta subgroup of Proteobacteria have been identified as nitrogen-fixing legume symbionts. Here we provide an overview of the history of the rhizobia and the widespread phylogenetic diversity of nitrogen-fixing legume symbionts.

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Transduction of plant signal molecules by the Rhizobium NodD proteins

Cited by 48 publications

References 49 publications

Molecular Basis of Symbiotic Promiscuity

Molecular Basis of Symbiotic Promiscuity

A 2-O-methylfucose moiety is present in the lipo-oligosaccharide nodulation signal of Bradyrhizobium japonicum.

Taxonomy of Bacteria Nodulating Legumes

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