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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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Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
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Medical management of tuberculosis (TB) patients involves a comprehensive approach that includes diagnosis, treatment, and monitoring. The specific strategies can vary depending on the type of tuberculosis (latent or active), the patient's overall health status, and other considerations.
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Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
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Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
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Nitrate reduction pathways in mycobacteria and their implications during latency.

Arshad Khan1, Dhiman Sarkar2

  • 1Department of Pathology and Laboratory Medicine, University of Texas, Health Science Center at Houston, Medical School, Houston, TX 77030, USA.

Microbiology (Reading, England)
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Understanding nitrate metabolism in mycobacteria is key to developing new tuberculosis (TB) drugs. This pathway helps Mycobacterium tuberculosis survive host defenses during latent infection.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Mycobacterial persistence is a major challenge for tuberculosis (TB) therapy duration.
  • Targeting persistent Mycobacterium tuberculosis requires understanding its latent physiology and metabolic state.
  • Nitrate reduction pathways in mycobacteria are increasingly recognized for their potential role in TB drug development.

Purpose of the Study:

  • To review the nitrate metabolic pathways in mycobacteria.
  • To provide insights into Mycobacterium tuberculosis adaptation mechanisms during host infection.
  • To highlight the link between nitrate reduction and mycobacterial latency.

Main Methods:

  • Biochemical studies of nitrate reduction pathways.
  • Genetic analyses of enzymes and proteins involved in nitrate metabolism.
  • Comparative analysis of nitrate reduction in pathogenic and non-pathogenic mycobacteria.
  • Investigation of pathway regulation under oxygen and nutrient limitation.

Main Results:

  • Distinct proteins and enzymes are involved in mycobacterial nitrate reduction.
  • Nitrate reduction varies between mycobacterial species and is regulated by environmental conditions.
  • Nitrate reduction pathways appear linked to mycobacterial latency and adaptation.
  • Interconnected respiratory and assimilatory nitrate reduction enhances metabolic flexibility.

Conclusions:

  • Nitrate metabolism is crucial for Mycobacterium tuberculosis survival and adaptation in the host.
  • Understanding these pathways can reveal novel drug targets for persistent TB.
  • Metabolic flexibility, facilitated by nitrate reduction, is key to mycobacterial persistence.