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Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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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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Comparative Excretory Systems02:24

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Animals have evolved different strategies for excretion, the removal of waste from the body. Most waste must be dissolved in water to be excreted, so an animal’s excretory strategy directly affects its water balance.
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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
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Ammonia-oxidizing bacteria and archaea exhibit differential nitrogen source preferences.

Wei Qin1,2, Stephany P Wei3, Yue Zheng4

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Ammonia-oxidizing microorganisms (AOM) utilize ammonia and urea differently, revealing distinct ecological niches. This metabolic flexibility explains how different AOM lineages coexist in nitrogen cycling.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Biogeochemistry

Background:

  • Ammonia-oxidizing microorganisms (AOM) are key players in global nitrogen cycling.
  • Four main AOM lineages (AOA, β-AOB, γ-AOB, comammox) compete for ammonia, a primary nitrogen substrate.
  • Many AOM can also metabolize urea, but how this impacts their ecology is unclear.

Purpose of the Study:

  • To investigate the coordination of ammonia and urea metabolism in different AOM lineages.
  • To understand how differential substrate utilization influences AOM ecology and coexistence.

Main Methods:

  • Stable isotope tracing
  • Enzyme kinetics assays
  • Transcriptomics

Main Results:

  • Ammonia-oxidizing archaea (AOA) and comammox preferentially use ammonia over urea.
  • Beta-proteobacterial ammonia-oxidizing bacteria (β-AOB) favor urea, repressing ammonia transport in its presence.
  • Gamma-proteobacterial ammonia-oxidizing bacteria (γ-AOB) co-utilize both ammonia and urea.

Conclusions:

  • AOM lineages exhibit distinct regulatory strategies for ammonia and urea metabolism.
  • These contrasting strategies minimize direct substrate competition, facilitating niche adaptation and coexistence.
  • Metabolic flexibility in nitrogen substrate utilization is crucial for understanding microbial community structure in nitrogen cycling.