Riboregulation in Nitrogen-Fixing Endosymbiotic Bacteria

Garrido, Marta; García-Tomsig, Natalia I.; Jiménez‐Zurdo, José I.

doi:10.3390/microorganisms8030384

Cited by 13 publications

(12 citation statements)

References 140 publications

(255 reference statements)

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“…were found to be more abundant in rice roots expressing high levels of nitrogenase in the aerenchyma to indicate the location within the roots [ 68 ]. The process of nodulation and N 2 -fixation by endophytic rhizobia has been well studied and there are several excellent reviews available [ 69 , 70 , 71 ], and it is therefore not elaborated here ( Figure 1 ).…”

Section: Rhizosphere and Root Endophytesmentioning

confidence: 99%

The Endophytic Microbiome as a Hotspot of Synergistic Interactions, with Prospects of Plant Growth Promotion

Vandana

Rajkumari

Singha

et al. 2021

Biology

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The plant root is the primary site of interaction between plants and associated microorganisms and constitutes the main components of plant microbiomes that impact crop production. The endophytic bacteria in the root zone have an important role in plant growth promotion. Diverse microbial communities inhabit plant root tissues, and they directly or indirectly promote plant growth by inhibiting the growth of plant pathogens, producing various secondary metabolites. Mechanisms of plant growth promotion and response of root endophytic microorganisms for their survival and colonization in the host plants are the result of complex plant-microbe interactions. Endophytic microorganisms also assist the host to sustain different biotic and abiotic stresses. Better insights are emerging for the endophyte, such as host plant interactions due to advancements in ‘omic’ technologies, which facilitate the exploration of genes that are responsible for plant tissue colonization. Consequently, this is informative to envisage putative functions and metabolic processes crucial for endophytic adaptations. Detection of cell signaling molecules between host plants and identification of compounds synthesized by root endophytes are effective means for their utilization in the agriculture sector as biofertilizers. In addition, it is interesting that the endophytic microorganism colonization impacts the relative abundance of indigenous microbial communities and suppresses the deleterious microorganisms in plant tissues. Natural products released by endophytes act as biocontrol agents and inhibit pathogen growth. The symbiosis of endophytic bacteria and arbuscular mycorrhizal fungi (AMF) affects plant symbiotic signaling pathways and root colonization patterns and phytohormone synthesis. In this review, the potential of the root endophytic community, colonization, and role in the improvement of plant growth has been explained in the light of intricate plant-microbe interactions.

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Section: Rhizosphere and Root Endophytesmentioning

confidence: 99%

The Endophytic Microbiome as a Hotspot of Synergistic Interactions, with Prospects of Plant Growth Promotion

Vandana

Rajkumari

Singha

et al. 2021

Biology

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“…Recently, Hfq was shown to contribute to the distribution of sRNAs to the poles of E. coli cells experiencing envelope stress, suggesting a role for Hfq in spatiotemporal regulation of gene expression ( 18 ). Although previous studies have demonstrated a role for Hfq in the Ntr response in the N 2 -fixing symbiont Sinorhizobium meliloti ( 19 ), the role of Hfq-mediated riboregulation in the Ntr response of enterobacteria remains unknown. Hence, the initial aim of this study was to investigate the role of Hfq in regulating the flow of genetic information during the Ntr response in E. coli .…”

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confidence: 99%

The RNA-binding protein Hfq assembles into foci-like structures in nitrogen starved Escherichia coli

McQuail

Switzer

Burchell

et al. 2020

Journal of Biological Chemistry

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The initial adaptive responses to nutrient depletion in bacteria often occur at the level of gene expression. Hfq is an RNA-binding protein present in diverse bacterial lineages and contributes to many different aspects of RNA metabolism during gene expression. Using photoactivated localization microscopy (PALM) and single molecule tracking, we demonstrate that Hfq forms a distinct and reversible focus-like structure in Escherichia coli specifically experiencing long-term nitrogen (N) starvation. Using the ability of T7 phage to replicate in N-starved bacteria as a biological probe of E. coli cell function during N starvation, we demonstrate that Hfq foci have a role in the adaptive response of E. coli to long-term N starvation. We further show that Hfq foci formation does not depend on gene expression once N starvation has set in and occurs independently of the transcription factor N-regulatory protein C (NtrC), that activates the initial adaptive response to N starvation in E. coli. These results serve as a paradigm to demonstrate that bacterial adaptation to long-term nutrient starvation can be spatiotemporally coordinated and can occur independently of de novo gene expression during starvation.

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“…Our knowledge about sRNAs is less advanced in other prokaryotes (Adams & Storz, 2020). sRNA-mediated gene expression control is known to be abundant in α-proteobacteria (Becker et al, 2014;Robledo et al, 2020). Examples are the regulation of photosynthesis genes by the sRNA PcrZ in Rhodobacter sphaeroides (Mank et al, 2012) or the sRNAs EcpR1 modulating cell cycle progression, and NfeR1 involved in osmoadaptation and symbiotic efficiency in the nitrogen-fixing plant symbiont Sinorhizobium meliloti (Robledo et al, 2015(Robledo et al, , 2017.…”

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confidence: 99%

A LysR‐type transcriptional regulator controls the expression of numerous small RNAs in Agrobacterium tumefaciens

Eisfeld

Kraus

Ronge

et al. 2021

Molecular Microbiology

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Small RNAs (sRNAs) are responsible for the swift conditiondependent posttranscriptional regulation of numerous cellular processes, such as stress responses, cell division, quorum sensing, or virulence (Storz et al., 2011). Thanks to the emergence of high-throughput sequencing approaches, the field has progressed rapidly, in particular in model enterobacteria such as Escherichia coli and Salmonella enterica (Hör et al., 2018(Hör et al., , 2020. The uncovered sRNA-mediated regulatory mechanisms are very diverse and range from intermolecular interaction of the sRNA with the translation initiation region of a target mRNA to more unconventional mechanisms

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Riboregulation in Nitrogen-Fixing Endosymbiotic Bacteria

Cited by 13 publications

References 140 publications

The Endophytic Microbiome as a Hotspot of Synergistic Interactions, with Prospects of Plant Growth Promotion

The Endophytic Microbiome as a Hotspot of Synergistic Interactions, with Prospects of Plant Growth Promotion

The RNA-binding protein Hfq assembles into foci-like structures in nitrogen starved Escherichia coli

A LysR‐type transcriptional regulator controls the expression of numerous small RNAs in Agrobacterium tumefaciens

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