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Prokaryotes

Genome Sequence of the Atypical Symbiotic Frankia R43 Strain, a Nitrogen-Fixing and Hydrogen-Producing Actinobacterium

Petar Pujic, Alexander Bolotin, Pascale Fournier, Alexei Sorokin, Alla Lapidus, Kerstin H. Richau, Jerome Briolay, Farida Mebarki, Philippe Normand, Anita Sellstedt
Petar Pujic
aEcologie Microbienne UMR CNRS 5557, Université Lyon I, Université de Lyon, Villeurbanne, France
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Alexander Bolotin
bINRA, UMR 1319 Micalis-AgroParisTech, AgroParisTech UMR Micalis, Jouy en Josas, France
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Pascale Fournier
aEcologie Microbienne UMR CNRS 5557, Université Lyon I, Université de Lyon, Villeurbanne, France
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Alexei Sorokin
bINRA, UMR 1319 Micalis-AgroParisTech, AgroParisTech UMR Micalis, Jouy en Josas, France
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Alla Lapidus
cCenter for Algorithmic Biotechnology, Institute of Translational Biomedicine, St. Petersburg State University, St. Petersburg, Russia
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Kerstin H. Richau
dDepartment of Plant Physiology, UPSC, Umeå University, Umeå, Sweden
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Jerome Briolay
eDTAMB-Biofidal, Département NGS Université Claude Bernard - Lyon 1, Villeurbanne, France
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Farida Mebarki
eDTAMB-Biofidal, Département NGS Université Claude Bernard - Lyon 1, Villeurbanne, France
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Philippe Normand
aEcologie Microbienne UMR CNRS 5557, Université Lyon I, Université de Lyon, Villeurbanne, France
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Anita Sellstedt
dDepartment of Plant Physiology, UPSC, Umeå University, Umeå, Sweden
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DOI: 10.1128/genomeA.01387-15
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ABSTRACT

Frankia strain R43 is a nitrogen-fixing and hydrogen-producing symbiotic actinobacterium that was isolated from nodules of Casuarina cunninghamiana but infects only Elaeagnaceae. This communication reports the genome of the strain R43 and provides insights into the microbe genomics and physiological potentials.

GENOME ANNOUNCEMENT

Nitrogen is an essential element present in the majority of organic molecules in living cells, in particular in amino acids, nucleotides, amino sugars and their polymer-like proteins, nucleic acids, and bacterial envelope constituents. In nature, nitrogen occurs in oxidation states from −3 to +5. Almost all nitrogen compounds can be used and transformed by specific enzymes largely present in microorganisms and, to a lesser extent, in plants and animals. In soils poor in nitrogen, plants depend on its supply by nitrogen-fixing bacteria, either as symbionts associated with plants or as free-living bacteria. Biological nitrogen fixation reduces molecular nitrogen (N2) from air using hydrogen (6H++ 6e−) and produces two NH3 molecules. This reaction is catalyzed by nitrogenases, the metaloenzyme complexes, which have been essential to the sustenance of life on Earth for more than 3.2 billion years (1). Frankia are filamentous, Gram-positive, nitrogen-fixing actinobacteria. They infect more than 260 actinorhizal plant species belonging to 8 families of angiosperms (2). The strains were grouped into 4 clusters, cluster no. 1, containing strains infective on Alnus, Myrica, and Casuarina; no. 2 for Datisca, Coriaria, and Rosaceae; no. 3 for Elaeagnaceae and Gymnostoma; and no. 4 for noninfective (3).

The Frankia strain R43, which was originally isolated from Casuarina cunninghamiana (4, 5), is a nitrogen-fixing and also hydrogen-producing bacterium (6, 7). It was found not able to reinfect its host Casuarina, like other cluster no. 1 strains, but surprisingly, it infected Elaeagnaceae belonging to cluster no. 3. For genomic sequencing, its total DNA was prepared from 50 mL of bacterial culture grown in blood agar plate (BAP) medium (8) at 28°C. Cells were harvested, rinsed, and treated with lysozyme, RNase, proteinase K, and phenol-chloroform (50:50 w/w), followed by DNA precipitation using ethanol, and spectrophotometric quantification. The libraries for next-generation sequencing (NGS) and standard sequencing (llumina MiSeq, PacBio, Sanger) were prepared according to manufacturers’ instructions and sequenced with NGS technologies. A genome consensus of 10.45 Mb in 55 contigs was produced using SPAdes assembler (version 3.5.0) in de novo hybrid assembly mode (9) exploiting together 6,618,330 paired-end reads of Illumina MiSeq, 65,409 filtered subreads of Pacific Biotech, and the Sanger end reads of 381 fosmids. At 10.45 Mb, this is the largest Frankia genome described so far. The consensus sequence produced using Newbler 2.7 independent assembly of 176,528 454 NGS reads and Frankia sp. EAN1pec genome sequence (GenBank accession no. CP000820) was exploited as an “untrusted reference” (10). The genome sequence has been annotated using the RAST annotation suite (11). This permitted us to identify loci involved in bacteria-plant symbioses, such as those for nitrogen fixation, uptake hydrogenases, hopanoid biosynthesis, and iron-sulfur cluster biosynthesis that are upregulated in symbiotic Frankia alni (8) as well as several genes that are specific to Frankia R43 (12).

Nucleotide sequence accession number.The draft genome sequence of Frankia R43 was deposited at NCBI GenBank under the accession no. LFCW00000000.

ACKNOWLEDGMENTS

A. Sellstedt and K.H. Richau are supported by the C. Tryggers Foundation, Sweden. P.P., P.F., P.N., A.B., and A. Sorokin are supported by the French ANR grants (projects PathoBactEvol and BugsInACell). A.L. is supported by the Russian Science Foundation (grant no. 14-50-00069).

FOOTNOTES

    • Received 6 October 2015.
    • Accepted 8 October 2015.
    • Published 25 November 2015.
  • Copyright © 2015 Pujic et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 3.0 Unported license.

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Genome Sequence of the Atypical Symbiotic Frankia R43 Strain, a Nitrogen-Fixing and Hydrogen-Producing Actinobacterium
Petar Pujic, Alexander Bolotin, Pascale Fournier, Alexei Sorokin, Alla Lapidus, Kerstin H. Richau, Jerome Briolay, Farida Mebarki, Philippe Normand, Anita Sellstedt
Genome Announcements Nov 2015, 3 (6) e01387-15; DOI: 10.1128/genomeA.01387-15

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Genome Sequence of the Atypical Symbiotic Frankia R43 Strain, a Nitrogen-Fixing and Hydrogen-Producing Actinobacterium
Petar Pujic, Alexander Bolotin, Pascale Fournier, Alexei Sorokin, Alla Lapidus, Kerstin H. Richau, Jerome Briolay, Farida Mebarki, Philippe Normand, Anita Sellstedt
Genome Announcements Nov 2015, 3 (6) e01387-15; DOI: 10.1128/genomeA.01387-15
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