Nitrogen-fixing organisms are of importance to the environment, providing bioavailable nitrogen to the biosphere. Quantitative models have been used to complement the laboratory experiments and measurements, where such evaluations are difficult or costly. Here, we review the current state of the quantitative modeling of nitrogen-fixing organisms and ways to enhance the bridge between theoretical and empirical studies.
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http://dx.doi.org/10.1016/j.csbj.2020.11.022 | DOI Listing |
Environ Microbiol
January 2025
Department of Biology, University of Oxford, Oxford, UK.
Rhizobia and legumes form a symbiotic relationship resulting in the formation of root structures known as nodules, where bacteria fix nitrogen. Legumes release flavonoids that are detected by the rhizobial nodulation (Nod) protein NodD, initiating the transcriptional activation of nod genes and subsequent synthesis of Nod Factors (NFs). NFs then induce various legume responses essential for this symbiosis.
View Article and Find Full Text PDFNature
January 2025
Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA.
The low reduction potentials required for the reduction of dinitrogen (N) render metal-based nitrogen-fixation catalysts vulnerable to irreversible damage by dioxygen (O). Such O sensitivity represents a major conundrum for the enzyme nitrogenase, as a large fraction of nitrogen-fixing organisms are either obligate aerobes or closely associated with O-respiring organisms to support the high energy demand of catalytic N reduction. To counter O damage to nitrogenase, diazotrophs use O scavengers, exploit compartmentalization or maintain high respiration rates to minimize intracellular O concentrations.
View Article and Find Full Text PDFMicroorganisms
December 2024
Independent Researcher, 125493 Moscow, Russia.
A whole genome sequence of a new strain of the nitrogen-fixing bacterium known for its diverse plant growth-promoting bacteria (PGPB), was obtained for the first time. The strain, designated e AT, was isolated during a soil analysis in the Chernevaya taiga of Western Siberia, a unique and fertile forest ecosystem known for its diverse plant growth-promoting bacteria (PGPB). The genome under study is fully assembled into seven circular molecules, none of which are unequivocally plasmids, with a total length of 6.
View Article and Find Full Text PDFSci Rep
November 2024
Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, 305-8604, Japan.
Symbiotic nitrogen fixation is a highly coordinated process involving legume plants and nitrogen-fixing bacteria known as rhizobia. In this study, we investigated a novel Fix mutant of the model legume Lotus japonicus that develops root nodules with endosymbiotic rhizobia but fails in nitrogen fixation. Map-based cloning identified the causal gene encoding the filamentation temperature-sensitive H (FtsH) protein, designated as LjFtsH4.
View Article and Find Full Text PDFAppl Microbiol Biotechnol
November 2024
School of Public Health, Lanzhou University, Lanzhou, 730000, China.
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