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The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
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Inorganic Nitrogen Assimilation01:22

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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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Overview of Nitrogen Metabolism01:20

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Updated: Apr 1, 2026

Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
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Ammonia Transport.

Ned S Wingreen

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    PubMed
    Summary
    This summary is machine-generated.

    Ammonium/methylammonium transport (Amt) proteins are crucial for bacterial growth in low ammonia conditions. These membrane proteins facilitate the transport of ammonium (NH4+), aiding in nitrogen assimilation and regulation.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Biochemistry

    Background:

    • Ammonium/methylammonium transport (Amt) proteins are a distinct class of membrane-associated ammonia transporters found across various life forms.
    • In Escherichia coli and Salmonella enterica serovar Typhimurium, Amt proteins are vital for growth when ammonia concentrations are low.

    Purpose of the Study:

    • To review the function and characteristics of Amt proteins in Escherichia coli and Salmonella enterica serovar Typhimurium.
    • To explore the role of Amt proteins in ammonia transport and nitrogen regulation within these bacteria.

    Main Methods:

    • Review of existing literature on Amt proteins, including studies on their interaction with other proteins and their role in bacterial growth.
    • Analysis of experimental data concerning Amt protein function, stoichiometry, and specificity.

    Main Results:

    • Amt proteins are essential for maximal bacterial growth at low ammonia concentrations.
    • Evidence suggests AmtB specifically transports ammonium (NH4+) passively and bidirectionally.
    • Interactions between AmtB and signal-transduction proteins like GlnK indicate a role in nitrogen regulation.

    Conclusions:

    • AmtB is a critical membrane-associated ammonia transporter for bacterial survival and growth in ammonia-limited environments.
    • The transport mechanism mediated by AmtB likely involves the charged ammonium species (NH4+), not the uncharged ammonia molecule (NH3).
    • AmtB plays a significant role in the intricate nitrogen regulatory network of bacteria.