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Related Concept Videos

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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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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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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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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
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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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LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring
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Cholesterol Biosynthesis and Uptake in Developing Neurons.

Thiago C Genaro-Mattos1, Allison Anderson1, Luke B Allen2

  • 1Munroe-Meyer Institute for Genetics and Rehabilitation , University of Nebraska Medical Center , Omaha , Nebraska 68105 , United States.

ACS Chemical Neuroscience
|June 28, 2019
PubMed
Summary
This summary is machine-generated.

Developing neurons synthesize their own cholesterol, utilizing surrounding precursors and releasing cholesterol. This endogenous brain cholesterol synthesis is crucial for brain development.

Keywords:
Dhcr24Dhcr7LC-MS/MSSterol biosynthesisastrocytescholesteroldesmosteroldeveloping neurons

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Developmental Biology

Background:

  • Brain cholesterol biosynthesis is distinct from systemic cholesterol homeostasis.
  • This process begins during embryonic development and is vital for neuronal function.

Purpose of the Study:

  • To investigate neuronal and glial contributions to the brain cholesterol pool.
  • To understand cholesterol synthesis pathways in developing neurons and astrocytes.

Main Methods:

  • Utilized liquid chromatography-tandem mass spectrometry (LC-MS/MS) for sterol intermediate and cholesterol measurement.
  • Studied control, Dhcr7, and Dhcr24 cell cultures during neuronal differentiation.

Main Results:

  • Developing neurons rely on endogenous cholesterol synthesis and external sterol precursors.
  • Both neurons and astrocytes release cholesterol into their environment.
  • Neurons produce significantly more cholesterol per cell than astrocytes.
  • Neurons and astrocytes preferentially use the Bloch pathway, with desmosterol as the immediate cholesterol precursor.

Conclusions:

  • Endogenous sterol synthesis in developing neurons is a critical, complexly regulated process.
  • Neuronal and glial cells actively contribute to and modulate the brain cholesterol pool.