Biotransformation of bergapten and xanthotoxin by Glomerella cingulata.
The biotransformation of bergapten (1) by the fungus Glomerella cingulata gave the corresponding reduced acid, 6,7-furano-5-methoxy hydrocoumaric acid (2), a new compound. Xanthotoxin (3) was also converted to the corresponding reduced acid cnidiol b (4) and demethylated metabolite xanthotoxol (5) by G. cingulata. The structure of the new compound 2 was elucidated by high-resolution mass spectrometry, extensive NMR techniques, including (1)H NMR and (13)C NMR, (1)H-(1)H correlation spectroscopy, heteronuclear multiple quantum coherence, and heteonuclear multiple bond coherence. The methyl ester or methyl ether or methyl ester and ether derivatives of 2 and 4 were synthesized. All compounds were tested for the beta-secretase (BACE1) inhibitory activity in vitro. The methyl ester and ether derivative 8 was shown to possess BACE1 inhibitory activity, and a IC(50) value was 0.64 +/- 0.04 mM.
Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, Kowakae, Higashiosaka-shi, Osaka 577-8502, Japan.
Shinsuke
S
Marumoto
Mitsuo
M
Miyazawa
D000078223:5-Methoxypsoralen; D001711:Biotransformation; D008730:Methoxsalen / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism*; D015394:Molecular Structure; D020081:Phyllachorales / Q000737:chemistry / Q000378:metabolism*
D000078223:5-Methoxypsoralen; D008730:Methoxsalen