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Transformation of bile acids by Eubacterium lentum
Applied and Environmental Microbiology
|November 1, 1981
Summary
Eubacterium lentum fecal isolates possess enzymes that modify bile acids. Enzyme activity varies with bile acid type and oxygen levels.
Area of Science:
- Microbiology
- Biochemistry
- Enzymology
Background:
- Bile acids are crucial for digestion and metabolism.
- Gut microbiota plays a significant role in bile acid transformation.
- Specific enzymes involved in bile acid modification by gut bacteria are not fully characterized.
Purpose of the Study:
- To identify and characterize enzymes in Eubacterium lentum responsible for bile acid metabolism.
- To investigate the substrate specificity and reaction conditions affecting these enzymes.
Main Methods:
- Isolation and identification of fecal bacteria.
- Enzymatic assays to detect dehydrogenase and epimerase activities.
- Testing enzyme activity with various bile acid substrates under different oxygen tensions.
Main Results:
- Eubacterium lentum isolates exhibited 3 alpha-, 7 alpha-, and 12 alpha-dehydrogenase activities.
- An epimerizing enzyme(s) for the 3 alpha-hydroxy group was also detected.
- Enzyme activities showed variability depending on the specific bile acid substrate used.
- Oxygen tension significantly influenced the manifestation of enzyme activities.
Conclusions:
- Eubacterium lentum possesses a diverse enzymatic machinery for bile acid modification.
- The metabolic potential of these enzymes is modulated by substrate availability and environmental conditions.
- These findings contribute to understanding the role of gut bacteria in host bile acid homeostasis.