A vapBC-type toxin-antitoxin module of Sinorhizobium meliloti influences symbiotic efficiency and nodule senescence of Medicago sativa

Justine Lipuma, Gyöngyi Cinege, Monica Bodogai, Boglárka Oláh, Aurélie Kiers, G. Endré, Laurence Dupont, Ilona Dusha

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Summary: The symbiotic nitrogen-fixing soil bacterium Sinorhizobium meliloti carries a large number of toxin-antitoxin (TA) modules both on the chromosome and megaplasmids. One of them, the vapBC-5 module that belongs to the type II systems was characterized here. It encodes an active toxin vapC-5, and was shown to be controlled negatively by the complex of its own proteins. Different mutants of the vapBC-5 genes exhibited diverse effects on symbiotic efficiency during interaction with the host plant Medicago sativa. The absence of the entire vapBC-5 region had no influence on nodule formation and nitrogen fixation properties. The strain carrying an insertion in the antitoxin gene showed a reduced nitrogen fixation capacity resulting in a lower plant yield. In contrast, when the toxin gene was mutated, the strain developed more efficient symbiosis with the host plant. The nitrogen fixing root nodules had a delayed senescent phenotype and contained elevated level of plant-derived molecules characteristic of later steps of nodule development. The longer bacteroid viability and abundance of active nitrogen fixing zone resulted in increased production of plant material. These data indicate that modification of the toxin/antitoxin production may influence bacteroid metabolism and may have an impact on the adaptation to changing environmental conditions.

Original languageEnglish
Pages (from-to)3714-3729
Number of pages16
JournalEnvironmental Microbiology
Volume16
Issue number12
DOIs
Publication statusPublished - Dec 1 2014

Fingerprint

Sinorhizobium meliloti
antitoxins
Antitoxins
Ensifer meliloti
Medicago sativa
senescence
toxin
toxins
nitrogen fixation
Nitrogen Fixation
host plant
gene
host plants
Nitrogen
nitrogen-fixing bacteria
genes
nitrogen
Genes
soil bacteria
root nodules

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics
  • Medicine(all)

Cite this

A vapBC-type toxin-antitoxin module of Sinorhizobium meliloti influences symbiotic efficiency and nodule senescence of Medicago sativa. / Lipuma, Justine; Cinege, Gyöngyi; Bodogai, Monica; Oláh, Boglárka; Kiers, Aurélie; Endré, G.; Dupont, Laurence; Dusha, Ilona.

In: Environmental Microbiology, Vol. 16, No. 12, 01.12.2014, p. 3714-3729.

Research output: Contribution to journalArticle

Lipuma, Justine ; Cinege, Gyöngyi ; Bodogai, Monica ; Oláh, Boglárka ; Kiers, Aurélie ; Endré, G. ; Dupont, Laurence ; Dusha, Ilona. / A vapBC-type toxin-antitoxin module of Sinorhizobium meliloti influences symbiotic efficiency and nodule senescence of Medicago sativa. In: Environmental Microbiology. 2014 ; Vol. 16, No. 12. pp. 3714-3729.
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