Related Experiment Video
Updated: Jul 7, 2026

Methods for Electroporation and Transformation Confirmation in Limosilactobacillus reuteri DSM20016
Published on: June 23, 2023
Microbial transformation of isosteviol lactone and evaluation of the transformation products on androgen response
Bo-Hon Chou1, Li-Ming Yang, Shwu-Fen Chang
1Department of Medicinal Chemistry, College of Pharmacy, Taipei Medical University, Taipei 110, Taiwan.
Abstract:
Two filamentous fungi, Cunninghamella bainieri ATCC 9244 and Aspergillus niger BCRC 32720, were used to investigate the biotransformation of isosteviol lactone (4alpha-carboxy-13alpha-hydroxy-13,16- seco-ent-19-norbeyeran-16-oic acid 13,16-lactone) ( 2), which was derived by reacting isosteviol ( ent-16-oxobeyeran-19-oic acid) ( 1) with m-chloroperbenzoic acid. Incubation of 2 with C. bainieri afforded metabolites 3- 6, which involved isomerization, hydroxylation, and ring cleavage reactions followed by oxidation and selective O-methylation. Incubation of 2 with A. niger afforded mono-, di-, and trihydroxylated metabolites 3, 4, and 7- 12. The structures of 3- 12 were elucidated on the basis of spectroscopic analyses, and structures 3, 4, and 6 were confirmed by X-ray crystallographic studies. Compounds 2- 6, 8- 10, and 12 were assayed as androgen agonists using an ARE (androgen response element)-mediated luciferase reporter gene assay. Compounds 3, 6, and 10 were significantly active, with 6 showing more activity than testosterone.
Related Concept Videos
Bacterial Transformation
Bacterial Transformation
Transformation
Signal Transduction: Overview
Typically, signal transduction involves three...
Drug Biotransformation: Overview
In vitro Mutagenesis

