Abstract：
:A different type of biologically active compound from Kuji amber (Late Cretaceous, Japan) before the K-Pg boundary [65 million years ago (Ma)] was isolated based on the growth-restoring activity of a mutant yeast involving Ca2+ signal transduction. It was identified as a spirolactone norditerpenoid, (4R*, 5S*, 8R*, 9R*, 10S*)-14,15,16,19-tetranor-labdan-13,9-olide (1) from spectral analyses with high-resolution electron ionization mass spectrometry (HREIMS), 1D and 2D nuclear magnetic resonance (NMR). Although the planar structure of 1 is known as an artificial derivative from marrubiin, it was isolated as a natural product from Kuji amber and its structure was elucidated for the first time. It had a growth-restoring activity against the mutant yeast through the direct or indirect inhibition of calcineurin activity [protein phosphatase, Mg2+/Mn2+-dependent 1A (PPM1A) activation]. Furthermore, the compound had potent inhibitory effect against the degranulation of rat basophilic leukemia 2H3 (RBL-2H3) cells.
journal_name
Fitoterapiajournal_title
Fitoterapiaauthors
Shimizu E,Koshino H,Noro A,Maruyama M,Shimoda N,Uesugi S,Ohnishi M,Kimura KIdoi
10.1016/j.fitote.2019.02.027subject
Has Abstractpub_date
2019-04-01 00:00:00pages
290-296eissn
0367-326Xissn
1873-6971pii
S0367-326X(18)32422-5journal_volume
134pub_type
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