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Overview of Nitrogen Metabolism01:20

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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Updated: May 23, 2025

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Engineering nitrogen and carbon fixation for next-generation plants.

Zehong Zhao1, Alisdair R Fernie2, Youjun Zhang1

  • 1State Key Laboratory of Seed Innovation, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China; College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China.

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Summary

Synthetic biology advances can enhance plant nitrogen and carbon assimilation for improved agriculture and sustainability. Engineering these pathways offers crops greater productivity and resilience, even in extreme environments.

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Area of Science:

  • Plant Science
  • Synthetic Biology
  • Agricultural Science

Background:

  • Global agriculture faces challenges in plant nitrogen (N) and carbon (C) acquisition and assimilation, impacting food security and sustainability.
  • Optimizing N and C pathways is crucial for enhancing crop productivity and resilience.

Purpose of the Study:

  • To explore the potential of synthetic biology for engineering plant nitrogen fixation and carbon fixation mechanisms.
  • To discuss strategies for enhancing crop growth in extreme environments through modified N and C pathways.
  • To highlight future perspectives integrating enzyme engineering for metabolic innovation.

Main Methods:

  • Utilizing synthetic biology techniques such as directed evolution and artificial intelligence (AI)-guided enzyme design.
  • Engineering nitrogenase for atmospheric N2 fixation in plants and symbiotic bacteria.
  • Metabolic engineering to enhance carbon fixation and photosynthetic efficiency.
  • Modifying source-to-sink relationships for improved assimilate flux.

Main Results:

  • Potential for optimizing nitrogenase and nitrogen fixation in plants and associated microbes.
  • Strategies for enhancing carbon fixation and photosynthetic efficiency.
  • Engineering approaches to improve crop growth and resource-use efficiency in challenging environments.
  • Combined engineering of N and C pathways promises enhanced crop productivity and resilience.

Conclusions:

  • Synthetic biology offers powerful tools to engineer plant N and C pathways for improved agriculture.
  • Engineered crops can exhibit enhanced productivity, resource-use efficiency, and resilience, even in extreme conditions.
  • Future integration of enzyme engineering and computational design will accelerate innovation in plant metabolic engineering.