skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Electron Transfer to Nitrogenase in Different Genomic and Metabolic Backgrounds

Journal Article · · Journal of Bacteriology
DOI:https://doi.org/10.1128/JB.00757-17· OSTI ID:1470211

Nitrogenase catalyzes the reduction of dinitrogen (N2) using low-potential electrons from ferredoxin (Fd) or flavodoxin (Fld) through an ATP-dependent process. Since its emergence in an anaerobic chemoautotroph, this oxygen (O2)-sensitive enzyme complex has evolved to operate in a variety of genomic and metabolic backgrounds, including those of aerobes, anaerobes, chemotrophs, and phototrophs. However, whether pathways of electron delivery to nitrogenase are influenced by these different metabolic backgrounds is not well understood. Here, we report the distribution of homologs of Fds, Flds, and Fd-/Fld-reducing enzymes in 359 genomes of putative N2 fixers (diazotrophs). Six distinct lineages of nitrogenase were identified, and their distributions largely corresponded to differences in the host cells' ability to integrate O2 or light into energy metabolism. The predicted pathways of electron transfer to nitrogenase in aerobes, facultative anaerobes, and phototrophs varied from those in anaerobes at the levels of Fds/Flds used to reduce nitrogenase, the enzymes that generate reduced Fds/Flds, and the putative substrates of these enzymes. Proteins that putatively reduce Fd with hydrogen or pyruvate were enriched in anaerobes, while those that reduce Fd with NADH/NADPH were enriched in aerobes, facultative anaerobes, and anoxygenic phototrophs. Here, the energy metabolism of aerobic, facultatively anaerobic, and anoxygenic phototrophic diazotrophs often yields reduced NADH/NADPH that is not sufficiently reduced to drive N2 reduction. At least two mechanisms have been acquired by these taxa to overcome this limitation and to generate electrons with potentials capable of reducing Fd. These include the bifurcation of electrons or the coupling of Fd reduction to reverse ion translocation.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Biological Electron Transfer and Catalysis (BETCy)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012518
OSTI ID:
1470211
Journal Information:
Journal of Bacteriology, Vol. 200, Issue 10; Related Information: BETCy partners with Montana State University (lead); Arizona State University; National Renewable Energy Laboratory; University of Georgia; University of Kentucky; University of Washington; Utah State University; ISSN 0021-9193
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

References (124)

The molybdenum and vanadium nitrogenases of Azotobacter chroococcum: effect of elevated temperature on N2 reduction journal January 1993
Molecular cloning and sequence analysis of the structural gene of ferredoxin I from the photosynthetic bacterium Rhodobacter capsulatus. journal November 1989
Biochemistry, evolution and physiological function of the Rnf complex, a novel ion-motive electron transport complex in prokaryotes journal November 2010
Heterocyst-specific flavodiiron protein Flv3B enables oxic diazotrophic growth of the filamentous cyanobacterium Anabaena sp. PCC 7120 journal July 2014
Classifying the metal dependence of uncharacterized nitrogenases journal January 2013
Flavodoxin from the nitrogen-fixing cyanobacterium Anabaena PCC 7119 journal June 1988
Physical and genetic map of the major nif gene cluster from Azotobacter vinelandii. journal February 1989
A pathway for biological methane production using bacterial iron-only nitrogenase journal January 2018
A [2Fe-2S] ferredoxin (FdVI) is essential for growth of the photosynthetic bacterium Rhodobacter capsulatus. journal May 1997
The base sequence of the nifF gene of Klebsiella pneumoniae and homology of the predicted amino acid sequence of its protein product to other flavodoxins journal December 1985
Stopped-flow kinetic studies of low potential electron carriers of the photosynthetic bacterium, Rhodobacter capsulatus: ferredoxin I and NifF journal July 1998
The role of geochemistry and energetics in the evolution of modern respiratory complexes from a proton-reducing ancestor journal July 2016
[FeFe]- and [NiFe]-hydrogenase diversity, mechanism, and maturation journal June 2015
Open reading frame 5 (ORF5), encoding a ferredoxinlike protein, and nifQ are cotranscribed with nifE, nifN, nifX, and ORF4 in Rhodobacter capsulatus. journal May 1989
Biosynthesis of the Iron-Molybdenum Cofactor of Nitrogenase journal March 2013
Cloning, characterization, and regulation of nifF from Rhodobacter capsulatus. journal July 1996
The involvement of the nif-associated ferredoxin-like genes fdxA and fdxN of Herbaspirillum seropedicae in nitrogen fixation journal February 2010
Nitrogenase activity in the non-heterocystous cyanobacterium Oscillatoria sp. grown under alternating light-dark cycles journal October 1985
Respiratory Protection of Nitrogenase Activity in Azotobacter vinelandii—Roles of the Terminal Oxidases journal June 1997
Oxygen relations of nitrogen fixation in cyanobacteria. journal January 1992
The Specific Influence of Acidity on the Mechanism of Nitrogen Fixation by Azotobacter journal January 1934
The Natural History of Nitrogen Fixation journal March 2004
The Isolation and Characterization of a New Iron-Sulfur Protein from Photosynthetic Membranes journal June 1974
Crystallization and structure determination of 2.5-.ANG. resolution of the oxidized iron-sulfur [2Fe-2S] ferredoxin isolated from Anabaena 7120 journal April 1991
The Bidirectional NiFe-hydrogenase in Synechocystis sp. PCC 6803 Is Reduced by Flavodoxin and Ferredoxin and Is Essential under Mixotrophic, Nitrate-limiting Conditions journal December 2013
Diversity and Activity of Alternative Nitrogenases in Sequenced Genomes and Coastal Environments journal February 2017
Transcriptional Profiling of Nitrogen Fixation in Azotobacter vinelandii journal July 2011
Unification of [FeFe]-hydrogenases into three structural and functional groups journal September 2016
Asymmetric Dimeric Structure of Ferredoxin-NAD(P)+ Oxidoreductase from the Green Sulfur Bacterium Chlorobaculum tepidum: Implications for Binding Ferredoxin and NADP+ journal August 2010
Purification of the nitrogenase proteins from Clostridium pasteurianum journal June 1972
Defining Electron Bifurcation in the Electron-Transferring Flavoprotein Family journal August 2017
Evidence for hydrogen oxidation and metabolic plasticity in widespread deep-sea sulfur-oxidizing bacteria journal December 2012
The heterocyst-specific fdxH gene product of the cyanobacterium Anabaena sp. PCC 7120 is important but not essential for nitrogen fixation journal February 1997
RAxML version 8: a tool for phylogenetic analysis and post-analysis of large phylogenies journal January 2014
Nitrogen Fixation at 92 C by a Hydrothermal Vent Archaeon journal December 2006
Identification of Global Ferredoxin Interaction Networks in Chlamydomonas reinhardtii journal October 2013
The Physiological Functions and Structural Determinants of Catalytic Bias in the [FeFe]-Hydrogenases CpI and CpII of Clostridium pasteurianum Strain W5 journal July 2017
Purification and characterization of ferredoxin–NAD(P)+ reductase from the green sulfur bacterium Chlorobium tepidum journal May 2002
The fixABCX Genes in Rhodospirillum rubrum Encode a Putative Membrane Complex Participating in Electron Transfer to Nitrogenase journal March 2004
Biosynthesis of the Iron-Molybdenum Cofactor of Nitrogenase journal October 2008
Bacterial Alternative Nitrogen Fixation Systems journal January 1988
Regulation and characterization of protein products coded by the nif (nitrogen fixation) genes of Klebsiella pneumoniae. journal January 1978
Nitrogenase and nitrogenase reductase associate and dissociate with each catalytic cycle. journal June 1978
Molecular Biological Analysis of a Bidirectional Hydrogenase from Cyanobacteria journal October 1995
Mechanism of Mo-Dependent Nitrogenase journal June 2009
Genetic and structural analysis of the Rhizobium meliloti fixA, fixB, fixC, and fixX genes. journal March 1987
The Genome of Heliobacterium modesticaldum, a Phototrophic Representative of the Firmicutes Containing the Simplest Photosynthetic Apparatus journal April 2008
Regulation of Uptake Hydrogenase and Effects of Hydrogen Utilization on Gene Expression in Rhodopseudomonas palustris journal August 2006
The vanadium- and molybdenum-containing nitrogenases of Azotobacter chroococcum. Comparison of mid-point potentials and kinetics of reduction by sodium dithionite of the iron proteins with bound magnesium adenosine 5′-diphosphate journal April 1988
Complete Genomic Sequence of the Filamentous Nitrogen-fixing Cyanobacterium Anabaena sp. Strain PCC 7120 journal January 2001
Average oxidation state of carbon in proteins journal November 2014
Identification of amino acids responsible for the oxygen sensitivity of ferredoxins from Anabaena variabilis using site-directed mutagenesis journal August 1999
Correction for creatine interference with the direct indophenol measurement of NH3 in steady-state nitrogenase assays journal November 1992
Crystal structure of the nickel–iron hydrogenase from Desulfovibrio gigas journal February 1995
Purification and properties of a nif-specific flavodoxin from the photosynthetic bacterium Rhodobacter capsulatus. journal November 1993
The Rhizobium meliloti fdxN gene encoding a ferredoxin-like protein is necessary for nitrogen fixation and is cotranscribed with nifA and nifB journal April 1989
The nitrogenase system from Azotobacter: two-enzyme requirement for N2 reduction, ATP-dependent H2 evolution, and ATP hydrolysis. journal September 1966
Evolution of the nitrogen cycle and its influence on the biological sequestration of CO2 in the ocean journal May 1997
Characterization of an fdxN mutant of Rhodobacter capsulatus indicates that ferredoxin I serves as electron donor to nitrogenase journal November 1995
Iron-sulphur clusters and the problem with oxygen journal February 2006
Roles of nifF and nifJ gene products in electron transport to nitrogenase in Klebsiella pneumoniae. journal January 1980
An Alternative Path for the Evolution of Biological Nitrogen Fixation journal January 2011
Hydrogenases journal March 2014
The importance of flavodoxin for environmental stress tolerance in photosynthetic microorganisms and transgenic plants. Mechanism, evolution and biotechnological potential journal July 2012
Bacterial Electron Transport Chains journal June 1988
The Ferredoxin:NAD + Oxidoreductase (Rnf) from the Acetogen Acetobacterium woodii Requires Na + and Is Reversibly Coupled to the Membrane Potential journal September 2013
Physiological and isotopic characteristics of nitrogen fixation by hyperthermophilic methanogens: Key insights into nitrogen anabolism of the microbial communities in Archean hydrothermal systems journal August 2014
Cyanobacterial Hydrogenases and Hydrogen Metabolism Revisited: Recent Progress and Future Prospects journal May 2015
Genomic and metagenomic surveys of hydrogenase distribution indicate H2 is a widely utilised energy source for microbial growth and survival journal September 2015
Crystallization and preliminary analysis of oxidized, recombinant, heterocyst [2Fe2S] ferredoxin from Anabaena 7120 journal April 1992
Evidence That the P i Release Event Is the Rate-Limiting Step in the Nitrogenase Catalytic Cycle journal June 2016
Structure−Function Relationships of Alternative Nitrogenases journal January 1996
A distinct ferredoxin for nitrogen fixation isolated from heterocysts of the cyanobacterium Anabaena variabilis journal May 1985
Consequences of the iron-dependent formation of ferredoxin and flavodoxin on photosynthesis and nitrogen fixation on Anabaena strains journal November 1990
Biochemical and Crystallographic Characterization of Ferredoxin−NADP + Reductase from Nonphotosynthetic Tissues , journal December 2001
Genome Sequence of Azotobacter vinelandii, an Obligate Aerobe Specialized To Support Diverse Anaerobic Metabolic Processes journal May 2009
A late methanogen origin for molybdenum-dependent nitrogenase: A late methanogen origin for Mo-nitrogenase journal April 2011
Construction and characterization of an Azotobacter vinelandii strain with mutations in the genes encoding flavodoxin and ferredoxin I. journal June 1989
Nucleotide sequence of a 24,206-base-pair DNA fragment carrying the entire nitrogen fixation gene cluster of Klebsiella pneumoniae journal October 1988
Electron transport to nitrogenase in Klebsiella pneumoniae. journal May 1980
Principles of Geobiochemistry journal November 2015
Purification and characterization of a fix ABCX-linked 2[4Fe-4S] ferredoxin from Azotobacter vinelandii journal October 1997
Geomicrobiology of Deep-Sea Hydrothermal Vents journal August 1985
A nitrogen pressure of 50 atmospheres does not prevent evolution of hydrogen by nitrogenase journal June 1984
CDD: NCBI's conserved domain database journal November 2014
Electron transfer to nitrogenase in Klebsiella pneumoniae. nifF gene cloned and the gene product, a flavodoxin, purified journal November 1985
Energy Conservation via Electron-Transferring Flavoprotein in Anaerobic Bacteria journal November 2007
A novel regulatory role of the Rnf complex of Azoarcus sp. strain BH72: rnf gene clusters in Azoarcus sp. BH72 journal December 2011
The Electron Bifurcating FixABCX Protein Complex from Azotobacter vinelandii : Generation of Low-Potential Reducing Equivalents for Nitrogenase Catalysis journal August 2017
Nucleotide Hydrolysis and Protein Conformational Changes in Azotobacter vinelandii Nitrogenase Iron Protein: Defining the Function of Aspartate 129 journal August 1995
Purification and molecular properties of a soluble ferredoxin from Rhodopseudomonas capsulata journal August 1982
New insights into the evolutionary history of biological nitrogen fixation journal January 2013
Overexpression in Escherichia coli of the rnf genes from Rhodobacter capsulatus . Characterization of two membrane-bound iron-sulfur proteins journal January 1998
Redox and spectroscopic properties of oxidized MoFe protein from Azotobacter vinelandii journal October 1980
Electron transport to nitrogenase in Rhodospirillum rubrum: Identification of a new fdxN gene encoding the primary electron donor to nitrogenase journal April 2005
Evolution of Molybdenum Nitrogenase during the Transition from Anaerobic to Aerobic Metabolism journal March 2015
Electron donation to nitrogenase in heterocysts of cyanobacteria journal November 1985
Distribution of nitrogen fixation and nitrogenase-like sequences amongst microbial genomes journal January 2012
Identification of a new class of nitrogen fixation genes in Rhodobacter capsalatus: a putative membrane complex involved in electron transport to nitrogenase journal December 1993
Role of a Ferredoxin Gene Cotranscribed with the nifHDK Operon in N2 Fixation and Nitrogenase "Switch-Off" of Azoarcus sp. Strain BH72 journal June 2001
Characterization of the genome region encoding an fdxH-type ferredoxin and a new 2[4Fe-4S] ferredoxin from the nonheterocystous, nitrogen-fixing cyanobacterium Plectonema boryanum PCC 73110. journal February 1994
Fast, scalable generation of high‐quality protein multiple sequence alignments using Clustal Omega journal January 2011
Deep-Sea Archaea Fix and Share Nitrogen in Methane-Consuming Microbial Consortia journal October 2009
fixA, B and C genes are essential for symbiotic and free-living, microaerobic nitrogen fixation journal May 1986
Horizontal transfer of the nitrogen fixation gene cluster in the cyanobacterium Microcoleus chthonoplastes journal September 2009
Azotobacter vinelandii NADPH:Ferredoxin Reductase Cloning, Sequencing, and Overexpression journal September 1995
Characterization of the fixABC region of Azorhizobium caulinodans ORS571 and identification of a new nitrogen fixation gene journal November 1988
Purification and characterization of pyruvate oxidoreductase from the photosynthetic bacterium Rhodobacter capsulatus journal November 1998
Calculation of the Relative Chemical Stabilities of Proteins as a Function of Temperature and Redox Chemistry in a Hot Spring journal August 2011
Biological nitrogen fixation: rates, patterns and ecological controls in terrestrial ecosystems journal July 2013
Recombinant expression of the fdxD gene of Rhodobacter capsulatus and characterization of its product, a [2Fe-2S] ferredoxin journal June 1994
Complete genome sequence of the metabolically versatile photosynthetic bacterium Rhodopseudomonas palustris journal December 2003
Oxygen relations of nitrogen fixation in cyanobacteria journal June 1992
Clostridial pyruvate oxidoreductase and the pyruvate-oxidizing enzyme specific to nitrogen fixation in Klebsiella pneumoniae are similar enzymes. journal August 1987
The Oxygen Sensitivity of Spinach Ferredoxin and Other Iron-Sulfur Proteins journal February 1971
Isolation and Characteristics of Flavodoxin from Nitrogen-fixing Clostridium pasteurianum journal June 1966
Studies on the Chemical Nature of Clostridial Ferredoxin journal December 1963
Isolation, sequencing, and mutagenesis of the nifF gene encoding flavodoxin from Azotobacter vinelandii. journal January 1988
Electron transport to nitrogenase. Purification and characterization of pyruvate:flavodoxin oxidoreductase. The nifJ gene product. journal October 1983
Two Biologically Active Ferredoxins from the Aerobic Nitrogen-fixing Bacterium, Azotobacter vinelandii journal July 1972
Purification and characterization of a novel dimeric ferredoxin (FdIII) from Rhodobacter capsulatus journal May 1993
A new [2Fe-2S] ferredoxin from Rhodobacter capsulatus. Coexpression with a 2[4Fe-4S] ferredoxin in Escherichia coli. journal February 1991
Genetic analysis of functional differences among distinct ferredoxins in Rhodobacter capsulatus journal July 1991
RAxML version 8: a tool for phylogenetic analysis and post-analysis of large phylogenies text January 2014

Cited By (7)

Control of nitrogen fixation in bacteria that associate with cereals journal December 2019
Origin and Evolution of Flavin-Based Electron Bifurcating Enzymes journal August 2018
Metalloproteins in the Biology of Heterocysts journal April 2019
Physiological adaptations to serpentinization in the Samail Ophiolite, Oman journal March 2019
NifA is the master regulator of both nitrogenase systems in Rhodobacter capsulatus journal August 2019
Changes in Carbon Oxidation State of Metagenomes Along Geochemical Redox Gradients journal February 2019
The path of electron transfer to nitrogenase in a phototrophic alpha‐proteobacterium journal July 2018