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Related Experiment Videos

Aromatase.

Y Osawa1, T Higashiyama, M Fronckowiak

  • 1Endocrine Biochemistry Department, Medical Foundation of Buffalo, Inc., NY 14203-1196.

Journal of Steroid Biochemistry
|January 1, 1987
PubMed
Summary
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Researchers purified two forms of aromatase (P2a and P3) from human placenta, identifying a 55 kDa cytochrome P-450. This enzyme synthesizes estrogens via cis-hydrogen elimination and exhibits a novel metabolic switching to 2 beta-hydroxylation.

Area of Science:

  • Biochemistry
  • Enzymology
  • Steroidogenesis

Background:

  • Aromatase is crucial for converting androgens to estrogens, involving complex monooxygenation steps.
  • Understanding aromatase's structure and function is key to steroidogenesis research.

Purpose of the Study:

  • To purify and characterize human placental aromatase.
  • To elucidate the mechanism of estrogen biosynthesis and identify novel metabolic pathways.

Main Methods:

  • Solubilization and chromatography techniques were used to isolate aromatase forms.
  • Immunoaffinity chromatography with a specific monoclonal antibody (MAb3-2C2) purified the enzyme.
  • Enzyme activity assays, SDS-PAGE, and reconstitution studies were performed.

Main Results:

Related Experiment Videos

  • Two aromatase forms (P2a, P3) were separated, yielding a 55 kDa cytochrome P-450.
  • Purified aromatase demonstrated high specific activity and stability.
  • Estrogen synthesis occurred via cis-1 beta, 2 beta-hydrogen elimination, contradicting previous claims.
  • Aromatase was found to perform 2 beta-hydroxylation of androgens, a newly discovered metabolic switch.
  • The MAb3-2C2 antibody indicated the presence of diverse aromatase isozymes across species.

Conclusions:

  • Human placental aromatase has been successfully purified and characterized.
  • The study clarifies the stereochemical mechanism of estrogen biosynthesis.
  • A novel 2 beta-hydroxylation pathway mediated by aromatase was discovered.
  • Evidence suggests the existence of multiple aromatase isozymes with varying species and tissue distributions.