shows how its symbiotic bacteria use two carbon fixation pathways to adapt to deep-sea conditions, suggesting potential for biotechnological applications in carbon capture.lives in the harsh deep-sea environment of the East Pacific Rise, where sunlight does not penetrate and the surroundings are known for their extreme temperatures, skull-crushing pressures, and toxic compounds.
“This paper is really a tour de force of going from studying living organisms and measuring their metabolic rates and allying them directly to transcripts in a way that allowed the research team to show that the pathways are very likely being run in parallel,” said senior co-author Peter Girguis, professor of Organismic and Evolutionary Biology.
“This is the most in-depth analysis of a bacteria that has two carbon fixation pathways, the rTCA and CBB,” said lead author and postdoctoral scholar Jessica Mitchell. “This is also the first network analysis done on a hydrothermal vent symbiosis and the first network analysis done on a dual carbon fixation pathway system.”
In contrast, the CBB cycle is associated with sulfide oxidation and assimilatory nitrate reduction. Sulfide oxidation is a vital process in the chemically rich environment of hydrothermal vents, where sulfides are abundant. By linking the CBB cycle to sulfide oxidation, the symbionts can effectively utilize the chemical energy available in their environment to fix carbon.One of the most intriguing findings of the study was the complementary nature of these two pathways.
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