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Related Experiment Videos

delta 4-3-Oxosteroid 5 beta-reductase. Structure and function.

Y Onishi1, M Noshiro, T Shimosato

  • 1Department of Biochemistry, Hiroshima University School of Dentistry.

Biological Chemistry Hoppe-Seyler
|December 1, 1991
PubMed
Summary

This study characterizes delta 4-3-oxosteroid 5 beta-reductase, a key enzyme in steroid metabolism. The enzyme

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Delta 4-3-oxosteroid 5 beta-reductase catalyzes the reduction of delta 4-3-oxosteroids to A/B cis-conformed products.
  • Understanding the enzyme's structure and function is crucial for steroid metabolism research.

Purpose of the Study:

  • To purify and characterize delta 4-3-oxosteroid 5 beta-reductase.
  • To determine the enzyme's amino acid sequence and identify its encoding cDNA.
  • To investigate the enzyme's tissue distribution and sex-based expression differences.

Main Methods:

  • Production of monoclonal antibodies against the enzyme.
  • Purification using reversed-phase liquid chromatography and lysyl endopeptidase digestion.
  • Isolation of cDNA from rat liver libraries and sequencing.
  • Transfection of COS cells to assess enzyme activity.
  • Immunoblotting assay for tissue distribution analysis.

Main Results:

  • The N-terminal amino acid was found to be blocked.
  • A cDNA encoding a 326-amino acid protein (Mr 37376) was isolated and sequenced.
  • Transfected COS cells exhibited broad substrate specificity for various delta 4-3-oxosteroids.
  • The enzyme was exclusively detected in the liver, with significant sex-based differences in content.
  • mRNA levels showed minimal sex-based differences, suggesting post-translational regulation.

Conclusions:

  • The complete amino acid sequence of delta 4-3-oxosteroid 5 beta-reductase was determined from its cDNA.
  • The enzyme demonstrates versatile substrate reduction capabilities.
  • Sexual dimorphism in enzyme levels is likely due to post-translational modification or degradation, not transcriptional differences.

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