Scientists reconstruct ancestral nitrogenase enzymes similar to modern versions
GS3Economy · S&T · Environment · Security· Biotechnology & health research· Prelims·
Why in news
Scientists reconstructed ancestral nitrogenase enzymes to study the evolutionary stability of nitrogen fixation mechanisms in microbes.
Background
Nitrogenase is the enzyme responsible for converting atmospheric nitrogen into ammonia. The study found that ancestral versions of these enzymes produce nitrogen isotope signatures similar to modern organisms, suggesting a stable biological machinery dating back billions of years.
Facts for Prelims
- S&TNitrogenase: Enzyme responsible for biological nitrogen fixation (BNF).
- S&TMolybdenum-based nitrogen fixation: A primary biochemical pathway for converting N2 to ammonia.
- FactAncestral enzymes reconstructed by scientists show isotopic signatures consistent with modern biological activity.
For Mains
Q. Discuss the significance of biological nitrogen fixation in sustainable agriculture and the evolutionary stability of nitrogenase enzymes in maintaining global nitrogen cycles.
Dimensions to cover in your answer
- Agricultural dependency: High reliance on synthetic fertilizers vs. the potential for harnessing stable biological nitrogen fixation.
- Evolutionary biology: Evidence of molybdenum-based fixation predating the oldest known biological activity markers.
Keywords: Nitrogen Fixation · Enzyme Evolution · Biochemical Pathways · Microbial Metabolism · Nitrogen Cycle
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