Participation of two members of the very long-chain acyl-CoA synthetase family in bile acid synthesis and recycling

Stephanie J. Mihalik, Steven J. Steinberg, Zhengtong Pei, Joseph Park, Do G. Kim, Ann K. Heinzer, Georges Dacremont, Ronald J.A. Wanders, Dean A. Cuebas, Kirby D. Smith, Paul A. Watkins

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


Bile acids are synthesized de novo in the liver from cholesterol and conjugated to glycine or taurine via a complex series of reactions involving multiple organelles. Bile acids secreted into the small intestine are efficiently reabsorbed and reutilized. Activation by thioesterification to CoA is required at two points in bile acid metabolism. First, 3α,7α,12α-trihydroxy-5β-cholestanoic acid, the 27-carbon precursor of cholic acid, must be activated to its CoA derivative before side chain cleavage via peroxisomal β-oxidation. Second, reutilization of cholate and other C24 bile acids requires reactivation prior to re-conjugation. We reported previously that homolog 2 of very long-chain acyl-CoA synthetase (VLCS) can activate cholate (Steinberg, S. J., Mihalik, S. J., Kim, D. G., Cuebas, D. A., and Watkins, P. A. (2000) J. Biol. Chem. 275, 15605-15608). We now show that this enzyme also activates chenodeoxycholate, the secondary bile acids deoxycholate and lithocholate, and 3α,7α,12α-trihydroxy-5β-cholestanoic acid. In contrast, VLCS activated 3α,7α,12α-trihydroxy-5β-cholestanoate, but did not utilize any of the C24 bile acids as substrates. We hypothesize that the primary function of homolog 2 is in the reactivation and recycling of C24 bile acids, whereas VLCS participates in the de novo synthesis pathway. Results of in situ hybridization, topographic orientation, and inhibition studies are consistent with the proposed roles of these enzymes in bile acid metabolism.

Original languageEnglish (US)
Pages (from-to)24771-24779
Number of pages9
JournalJournal of Biological Chemistry
Issue number27
StatePublished - Jul 5 2002

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


Dive into the research topics of 'Participation of two members of the very long-chain acyl-CoA synthetase family in bile acid synthesis and recycling'. Together they form a unique fingerprint.

Cite this