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Biosynthesis in Bacteria01:24

Biosynthesis in Bacteria

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Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
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Biosynthesis of Polysaccharides01:26

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Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
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Biosynthesis of Lipids01:29

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Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
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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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The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
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Aging01:26

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Related Experiment Video

Updated: Feb 10, 2026

Modeling Age-Associated Neurodegenerative Diseases in Caenorhabditis elegans
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NAD + biosynthesis, aging, and disease.

Sean Johnson1, Shin-Ichiro Imai1

  • 1Department of Developmental Biology, Washington University School of Medicine, St. Louis, USA.

F1000Research
|May 11, 2018
PubMed
Summary

Nicotinamide adenine dinucleotide (NAD+) levels decline with age, impacting health. Supplementing NAD+ precursors shows promise for treating age-related diseases and developing anti-aging interventions.

Area of Science:

  • Biochemistry
  • Gerontology
  • Metabolic pathways

Background:

  • Nicotinamide adenine dinucleotide (NAD+) biosynthesis and regulation are gaining research attention.
  • Aging is associated with a systemic decline in NAD+ levels across various tissues.
  • Dysfunctional NAD+ biosynthesis contributes to the pathology of age-related diseases, including metabolic, neurodegenerative, and mental disorders.

Purpose of the Study:

  • To explore the role of NAD+ biosynthesis in age-associated diseases.
  • To investigate NAD+-dependent enzymes, like sirtuins, in disease progression.
  • To evaluate NAD+ intermediates as a therapeutic strategy for anti-aging interventions.

Main Methods:

  • Review of recent studies on NAD+ metabolism.
  • Analysis of the link between NAD+ levels and age-related pathologies.
Keywords:
Biosynthesis AgingNAD+

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  • Examination of the therapeutic potential of NAD+ precursor supplementation.

    • Main Results:

    • NAD+ biosynthesis dysfunction is implicated in multiple age-associated diseases.
    • NAD+-dependent enzymes, such as sirtuins, are involved in disease progression.
    • Supplementation with NAD+ intermediates (nicotinamide mononucleotide, nicotinamide riboside) demonstrates therapeutic potential.

    Conclusions:

    • NAD+ biosynthesis represents a potential therapeutic target for age-associated diseases.
    • NAD+ precursor supplementation offers a proof of concept for anti-aging interventions.
    • Targeting NAD+ metabolism may provide effective strategies for promoting healthy aging.