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A stable genetic polymorphism underpinning microbial syntrophy.

Tobias Großkopf1, Simone Zenobi1, Mark Alston2

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Researchers discovered the genetic basis for syntrophy, a metabolic cooperation between microbes. A specific genotype of Desulfovibrio vulgaris with altered hydrogenase production enables syntrophic growth with Methanococcus maripaludis.

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Area of Science:

  • Microbiology
  • Metabolic Engineering
  • Genetics

Background:

  • Syntrophy involves interdependent metabolic cooperation between two organisms.
  • Many natural syntrophic interactions are mandatory, requiring one species to act as an electron sink.
  • The genetic underpinnings of these essential microbial partnerships remain largely unknown.

Purpose of the Study:

  • To identify the genetic drivers enabling syntrophy between Desulfovibrio vulgaris and Methanococcus maripaludis.
  • To understand the physiological adaptations that facilitate this specific microbial cooperation.
  • To lay the groundwork for engineering synthetic microbial communities.

Main Methods:

  • Analysis of genetic polymorphism in Desulfovibrio vulgaris.
  • Genomic and physiological characterization of a specific 'syntrophic' genotype.
  • Investigating the role of hydrogenase alterations in enabling syntrophy.

Main Results:

  • Desulfovibrio vulgaris exhibits a stable genetic polymorphism, with a specific genotype essential for syntrophy.
  • This 'syntrophic' genotype features two genetic alterations, including a deletion in the cooK gene of the hydrogenase.
  • Reshaped energy conservation in lactate oxidation produces sufficient hydrogen for Methanococcus maripaludis growth.

Conclusions:

  • This study provides the first genetic basis for natural syntrophy.
  • Specific genetic alterations in Desulfovibrio vulgaris are key to its syntrophic relationship.
  • Findings advance the rational engineering of syntrophic interactions in synthetic microbial communities.