Microbes use nitrogen oxides to generate energy in oxygen-poor environments
In short: Researchers have mapped out denitrification, a process where various microorganisms convert nitrogen oxides into energy. While once thought to be unique to bacteria, this metabolic pathway is now known to exist in certain archaea and even within the mitochondria of fungi. This process allows these organisms to survive in anaerobic or low-oxygen conditions by using nitrogen compounds as terminal electron acceptors.
The study synthesizes biochemical and genetic data from various species, including different types of bacteria and fungi. It highlights how denitrification is linked to fundamental cellular processes like protein translocation and gene regulation. By studying model organisms like Pseudomonads, scientists identified the roughly 50 genes required for this metabolic apparatus.
A limitation of this review is that while the enzymatic pathways in gram-negative bacteria are well-mapped, the specific topology and enzymology of gram-positive bacteria remain less established.
Why it matters: Understanding how microbes recycle nitrogen helps explain global nutrient cycles and the diversity of life in extreme environments.
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Sources
- Summary by Intellect · source: Research: Zumft (1997). Cell biology and molecular basis of denitrification. Microbiology and Molecular Biology Reviews.
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