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Biosynthesis of Nucleic Acids01:28

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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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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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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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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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Amines are organic derivatives of ammonia. They are formed by replacing one or more ammonia protons with alkyl or aryl groups. Depending upon the number of organyl groups bonded to nitrogen, amines are classified as primary, secondary, or tertiary. Primary amines have one organyl group attached to the nitrogen atom, while secondary and tertiary amines have two and three organyl groups attached to the nitrogen atom, respectively.
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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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Exploring the Arginine Methylome by Nuclear Magnetic Resonance Spectroscopy
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N(G)-Methylarginines: Biosynthesis, biochemical function and metabolism.

W K Paik1, S Kim

  • 1Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, 19140, Philadelphia, PA, USA.

Amino Acids
|November 6, 2013
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Summary

N(G)-Methylarginines are synthesized by specific enzymes and play roles in cell proliferation and myelin formation. These compounds may also influence nitric oxide activity, impacting vascular smooth muscle relaxation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Metabolism

Background:

  • N(G)-Methylarginines (N(G)-monomethylarginine, N(G), N(G)-dimethylarginine, N(G), N'(G)-dimethylarginine) are naturally occurring compounds found in both protein-bound and free forms.
  • Their synthesis involves protein methylase I enzymes utilizing S-adenosyl-L-methionine as a methyl donor, exhibiting high specificity for arginine residues and protein substrates.
  • The energy-dependent nature and enzymatic specificity suggest a regulatory role in protein function and metabolism.

Purpose of the Study:

  • To investigate the biological significance and regulatory roles of N(G)-Methylarginines.
  • To explore the involvement of protein methylase I in cell proliferation and myelin formation.
  • To examine the metabolic fate of free N(G)-Methylarginines and their potential interaction with nitric oxide.

Main Methods:

  • Enzymatic assays using histones and myelin basic protein (MBP) as in vitro substrates to measure protein methylase I activity.
  • Comparative analysis of protein methylase I activity in proliferating cells and in normal versus dysmyelinating mutant mouse brains.
  • Investigation of the metabolic pathways of free N(G)-Methylarginines, including decarboxylation, hydrolysis, and deimination.
  • Exploration of the interaction between N(G)-Methylarginines and nitric oxide (NO).

Main Results:

  • Protein methylase I activity correlated with the rate of cell proliferation when using histones as substrates.
  • A significant decrease in MBP-specific protein methylase I activity was observed in dysmyelinating mutant mouse brains during the myelinating period.
  • Free N(G)-Methylarginines are generated from methylated protein degradation and undergo various metabolic transformations.
  • Emerging evidence suggests a role for N(G)-Methylarginines in neutralizing nitric oxide (NO) activity.

Conclusions:

  • Enzymatic methylation of arginine residues by protein methylase I is crucial for regulating protein function and metabolism.
  • Protein methylase I activity is linked to cell proliferation and is important for myelin formation and/or maintenance.
  • Metabolism of free N(G)-Methylarginines involves multiple pathways, and they may function as endogenous regulators of nitric oxide signaling, impacting vascular functions.