Taipei Medical University

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
BH Chou
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------>journal_name=J Nat Prod
------>paper_name=Microbial Transformation of Isosteviol Lactone and Evaluation of the Transformation Products on Androgen Response Element
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------>fullAbstract=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.
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------>authors2=LM Yang
------>authors3=SF Chang
------>authors4=FL Hsu
------>authors5=CH Lo
------>authors6=J Liaw, PC Liu, SJ Lin
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------>authors=BH Chou
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------>updateTitle=Microbial transformation of isosteviol lactone and evaluation of the transformation products on androgen response element.
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------>publish_year=2008
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z