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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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Amino Acid Biosynthetic Pathways01:29

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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Sulfur Assimilation01:20

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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
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Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Glutamine reliance in cell metabolism.

Hee Chan Yoo1, Ya Chun Yu1, Yulseung Sung1

  • 1Yonsei Institute of Pharmaceutical Sciences, College of Pharmacy, Yonsei University, Incheon, 21983, South Korea.

Experimental & Molecular Medicine
|September 18, 2020
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Summary

This review explores glutamine metabolism in cancer, detailing its roles in biosynthesis and bioenergetics. It highlights glutamine

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Area of Science:

  • Cellular metabolism
  • Cancer biology
  • Biochemistry

Background:

  • Glutamine is a key amino acid supplying carbon and nitrogen for biosynthesis.
  • Recent research offers new insights into mitochondrial glutamine metabolism.
  • Understanding glutamine metabolism is crucial for cancer research.

Purpose of the Study:

  • To review the biosynthetic and bioenergetic roles of glutamine.
  • To explain cellular metabolic reliance on glutamine.
  • To explore glutamine's role in cancer, including drug resistance and epigenetic regulation.

Main Methods:

  • Literature review of studies on glutamine metabolism.
  • Analysis of compartmentalization of glutamine metabolism.
  • Examination of glutamine transporters and derivatives.

Main Results:

  • Glutamine fuels biosynthesis and bioenergetic processes.
  • Mitochondrial glutamine metabolism is key to cancer adaptation.
  • Glutamine metabolism reprogramming contributes to drug resistance.
  • Glutamine derivatives may influence epigenetic regulation in tumors.

Conclusions:

  • Cells exhibit significant metabolic reliance on glutamine.
  • Targeting glutamine metabolism and transporters offers therapeutic strategies for cancer.