Heat-stable enzyme from deep-sea microbe turns nitrogen gas into ammonia
Microorganisms can do remarkable things—for example, nitrogen fixation, the conversion of nitrogen gas (N₂) into a form that organisms can use. Although nitrogen gas makes up around 78% of Earth's atmosphere, plants and animals cannot directly use it.
Methanocaldococcus infernus, a deep-sea archaeon, harbors a heat-stable enzyme capable of converting nitrogen gas (N₂) into ammonia. This enzyme, known as nitrogenase, is unusually stable even at temperatures surpassing 90°C (194°F). The researchers from the Max Planck Institute for Marine Microbiology in Bremen managed to isolate and study this enzyme, revealing its unique molecular structure and function.
Nitrogenase contains a complex metallocofactor, which is essential for its activity. The scientists observed that this enzyme shares characteristics with various forms of nitrogenase, suggesting a common ancestor. Understanding nitrogen fixation, the process by which nitrogenase converts N₂ into ammonia, is crucial for various fields, including agriculture and carbon cycling.
The ability to harness this enzyme could lead to breakthroughs in sustainable agriculture and biofuel production without relying on industrial fertilizers.
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