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Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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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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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Nitrogenase and homologs.

Yilin Hu1, Markus W Ribbe

  • 1Department of Molecular Biology and Biochemistry, 2230 McGaugh Hall, University of California, Irvine, CA, 92697-3900, USA, yilinh@uci.edu.

Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry
|December 11, 2014
PubMed
Summary

Nitrogenase is crucial for biological nitrogen fixation. This enzyme and its homologs show remarkable versatility, with shared structures and functions despite distinct roles in various biological processes.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Nitrogenase catalyzes biological nitrogen fixation, a vital process in the global nitrogen cycle.
  • Three homologous nitrogenases are known, alongside related enzymes involved in diverse cellular functions.

Purpose of the Study:

  • To provide an overview of the structures and functions of nitrogenase and its homologs.
  • To highlight the similarities and differences within this enzyme family.

Main Methods:

  • Literature review and comparative analysis of existing data on nitrogenase and its homologs.
  • Structural and functional characterization of related enzymes.

Main Results:

  • Nitrogenase and its homologs share conserved structural and functional features.
  • Despite similarities, these enzymes exhibit distinct roles in nitrogen fixation, enzyme assembly, and biosynthesis pathways.

Conclusions:

  • The nitrogenase superfamily represents a versatile group of enzymes with conserved evolutionary origins.
  • Understanding these enzymes is key to comprehending nitrogen cycling and related biological processes.