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Thiolase involved in bile acid formation

M Bun-ya1, M Maebuchi, T Kamiryo

  • 1Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima.

Journal of Biochemistry
|April 16, 1998
PubMed
Summary

This study identifies a peroxisomal enzyme bifunctional protein and thiolase P-44 involved in bile acid synthesis. These enzymes convert cholesterol precursors into cholic and chenodeoxycholic acids, crucial for bile acid metabolism.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Bile acid synthesis, specifically cholic acid and chenodeoxycholic acid formation, is primarily a peroxisomal process.
  • The side chain cleavage of CoA esters of specific cholestanoic acids is a key step in bile acid production.
  • Previous research identified a novel peroxisomal enzyme, D-3-hydroxyacyl-CoA dehydratase/D-3-hydroxyacyl-CoA dehydrogenase bifunctional protein, potentially involved in this pathway.

Purpose of the Study:

  • To confirm the role of the D-3-hydroxyacyl-CoA dehydratase/D-3-hydroxyacyl-CoA dehydrogenase bifunctional protein in converting specific cholestenoic acid CoA esters to their 24-oxo-forms.
  • To validate the formation of 24-oxo-27-nor-cholestanes as products of the bifunctional protein reaction.
  • To confirm the involvement of the bifunctional protein and thiolase P-44 (or sterol carrier protein x) in the final production of cholic acid and chenodeoxycholic acid.

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Main Methods:

  • Gas chromatography-mass spectrometry (GC-MS) was employed to analyze the reaction products of the bifunctional protein.
  • Incubation of precursor molecules with the identified bifunctional protein and either sterol carrier protein x or thiolase P-44.
  • Gas chromatography (GC) was used to confirm the production of cholic acid and chenodeoxycholic acid.

Main Results:

  • The reaction catalyzed by the D-3-hydroxyacyl-CoA dehydratase/D-3-hydroxyacyl-CoA dehydrogenase bifunctional protein was confirmed to produce 24-oxo-27-nor-cholestanes.
  • Incubation with the bifunctional protein and either sterol carrier protein x or thiolase P-44 resulted in the confirmed production of cholic acid and chenodeoxycholic acid.
  • These findings support the hypothesis that the bifunctional protein and thiolase P-44 constitute a functional unit in peroxisomal bile acid synthesis.

Conclusions:

  • The D-3-hydroxyacyl-CoA dehydratase/D-3-hydroxyacyl-CoA dehydrogenase bifunctional protein plays a critical role in the early steps of bile acid synthesis by generating 24-oxo-27-nor-cholestanes.
  • The combined action of this bifunctional protein and thiolase P-44 (or sterol carrier protein x) is essential for the complete conversion of cholesterol precursors to cholic acid and chenodeoxycholic acid.
  • This research elucidates a key enzymatic pathway in peroxisomal bile acid metabolism.