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Bile acid transformations by Alcaligenes recti

I Mazumder1, S B Mahato

  • 1Indian Institute of Chemical Biology, Calcutta.

Steroids
|February 1, 1993
PubMed
Summary
This summary is machine-generated.

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Alcaligenes recti metabolizes bile acids through methylation and dehydrogenation. Methylation by S-adenosyl-L-methionine-dependent methyltransferase inhibits ring degradation, while dehydrogenation initiates it.

Area of Science:

  • Microbiology
  • Biochemistry
  • Enzymology

Background:

  • Bile acids are crucial in digestion and signaling.
  • Microbial metabolism significantly alters bile acid structures and functions.
  • Understanding bacterial bile acid transformation is key to host-microbe interactions.

Purpose of the Study:

  • To investigate the metabolic pathways of four primary bile acids by Alcaligenes recti.
  • To identify and characterize the specific enzymatic reactions involved in bile acid modification.
  • To elucidate the interplay between methylation and ring degradation in bile acid metabolism.

Main Methods:

  • Incubation of Alcaligenes recti cells with cholic acid, chenodeoxycholic acid, ursodeoxycholic acid, and deoxycholic acid.
  • Isolation and characterization of resulting metabolites using spectroscopic methods.

Related Experiment Videos

  • Analysis of enzymatic activities including methylation and dehydrogenation.

    • Main Results:

    • Alcaligenes recti produced methylated derivatives of all four bile acids studied.
    • Specific oxidized and unsaturated bile acid derivatives were identified, indicating dehydrogenation.
    • Two competing enzymatic reactions were observed: 3 alpha-hydroxy group methylation and A/B ring dehydrogenation.
    • Methylation, mediated by an S-adenosyl-L-methionine-dependent methyltransferase, appeared to inhibit ring degradation.
    • Dehydrogenation initiated ring system degradation, with 7 beta-dehydratase activity noted for ursodeoxycholic acid.

    Conclusions:

    • Alcaligenes recti possesses distinct enzymatic machinery for bile acid modification.
    • The bacterium employs competitive pathways involving methylation and dehydrogenation to transform bile acids.
    • Bile acid methylation by Alcaligenes recti may serve as a protective mechanism against further degradation.