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Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

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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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Mass Spectrometry: Cycloalkene Fragmentation00:54

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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
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Mass Spectrometry: Cycloalkane Fragmentation01:05

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In mass spectrometry, cycloalkanes exhibit distinct fragmentation patterns due to the inherent stability of their molecular ions compared to linear or branched alkanes. The ring structure of cycloalkanes provides additional stability to the molecular ions, often resulting in prominent ion peaks in the mass spectrum.
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Mass Spectrometry: Branched Alkane Fragmentation01:29

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This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
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Mass Spectrometry: Long-Chain Alkane Fragmentation01:18

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Identifying Molecular Fragments That Drive 7-Dehydrocholesterol Elevation.

Dario Ghersi1, Thiago C Genaro-Mattos2

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Researchers identified key molecular fragments in drugs that inhibit 7-dehydrocholesterol reductase (DHCR7). This computational approach aids in developing safer medications, particularly for pregnant women, by understanding enzyme inhibition mechanisms.

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Area of Science:

  • Biochemistry
  • Medicinal Chemistry
  • Computational Drug Discovery

Background:

  • Approximately 300 million prescriptions annually in the US involve medications with the side effect of inhibiting 7-dehydrocholesterol reductase (DHCR7).
  • DHCR7 is a crucial enzyme in the cholesterol biosynthesis pathway.
  • Many DHCR7-inhibiting drugs are prescribed to pregnant women, raising concerns about potential neurodevelopmental effects.

Purpose of the Study:

  • To develop a computational strategy for identifying enriched chemical fragments within DHCR7-inhibiting medications.
  • To pinpoint potential pharmacophores responsible for enzyme inhibition.
  • To contribute to knowledge-based drug development for improved medication safety.

Main Methods:

  • Systematic molecular fragmentation of DHCR7-inhibiting drugs using the molBLOCKS tool.
  • Enrichment analysis of identified molecular fragments.
  • Computational strategy for substructure identification.

Main Results:

  • Identification of enriched substructures (putative pharmacophores) within the studied drug set.
  • Highlighting specific chemical fragments associated with DHCR7 inhibition.
  • Demonstration of a computational approach for fragment-based drug analysis.

Conclusions:

  • The computational strategy effectively identifies key fragments responsible for DHCR7 inhibition.
  • Understanding these substructures is vital for designing safer drugs.
  • This research can enhance the neurodevelopmental safety profile of medications, especially for vulnerable populations.