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H Wasner1, F Lynen

  • 1Max-Planck-Institut für Zellchemie und Biochemisches Institut der Universität München, DBR, Germany

FEBS Letters
|December 23, 1970
PubMed
Summary
This summary is machine-generated.

Presqualenyl-pyrophosphate (PSPP) was synthesized from farnesyl-pyrophosphate (FPP) and characterized. The structure was confirmed through various chemical and isotopic analyses, establishing its role in squalene biosynthesis.

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Area of Science:

  • Biochemistry
  • Organic Chemistry

Background:

  • Farnesyl-pyrophosphate (FPP) is a precursor in isoprenoid biosynthesis.
  • The intermediate presqualenyl-pyrophosphate (PSPP) plays a crucial role in the pathway to squalene.

Purpose of the Study:

  • To synthesize presqualenyl-pyrophosphate (PSPP) from farnesyl-pyrophosphate (FPP).
  • To elucidate the structure of PSPP through a series of chemical and physical experiments.
  • To confirm the proposed structure of PSPP involved in squalene formation.

Main Methods:

  • Synthesis of PSPP from FPP.
  • Acid hydrolysis and bromine stabilization to determine bond lability and ester type.
  • Enzymatic cleavage using prostatic phosphatase and analysis by gas-liquid chromatography and mass spectrometry.

Related Experiment Videos

  • Isotopic labeling (3H/14C) to track atom distribution.
  • Ozonolysis to identify degradation products.

    • Main Results:

    • PSPP was synthesized and transformed into squalene with 90% yield.
    • Acid lability and bromine stabilization indicated an allylic ester structure.
    • Hydrolysis released pyrophosphate and water, suggesting a tertiary hydroxyl group.
    • Enzymatic and chromatographic analyses confirmed the molecular weight.
    • Isotopic studies and ozonolysis supported the proposed structure: 2,6,10,15,19,23-hexamethyl-n-tetracosa-2,6,11,14,18,22-hexaen-10-yl-pyrophosphate.

    Conclusions:

    • The structure of presqualenyl-pyrophosphate (PSPP) was definitively established.
    • PSPP is a key intermediate in the biosynthesis of squalene.
    • The chemical properties and degradation pathways are consistent with the proposed structure.