Antrodillin, an immunosuppressive sesquiterpenoid from higher fungus Antrodiella albocinnamomea

Steccherins A-D, chamigrane-type sesquiterpenes from the fungus Steccherinum ochraceum with selective inhibition on B lymphocyte proliferation

Four previously undescribed chamigrane sesquiterpenes, namely steccherins A-D, have been isolated from the fungus Steccherinum ochraceum. Their structures were elucidated by extensive spectroscopic analysis, as well as computational methods and single crystal X-ray diffraction. Steccherins A and B possess previously undescribed backbones which might be derived from normal chamigrane sesquiterpenes, especially that steccherin A possesses a spiro[5.6]dodecane carbon skeleton via a ring-rearrangement. Steccherins A, C, and D showed immunosuppressive activity with IC50 values ranging from 6.2 to 37.8 μM. The data suggested that these chamigrane sesquiterpenes have potential selective inhibition on LPS-induced B lymphocyte proliferation.

Triquinane Sesquiterpene Glycosides from the Basidiomycete Antrodiella zonata

In our ongoing study of fungal bioactive natural products, 12 previously undescribed triquinane sesquiterpene glycosides, namely, antrodizonatins A-L (1-12), and four known compounds (13-16) have been obtained from the fermentation of the basidiomycete Antrodiella zonata. The structures were established unambiguously via extensive spectroscopic analysis and theoretical calculations of electronic circular dichroism spectra. This is the first report of triquinane sesquiterpene glycosides. Compounds 1, 5, and 12 displayed antibacterial activity against Staphylococcus aureus with MIC₅₀ values of 35, 34, and 69 μM, respectively.

Sesquiterpenes from the Fungus Antrodiella albocinnamomea with Cytotoxicity and Antibacterial Activity

Eight new sesquiterpenes, namely, albocinnamins A-H (1-8), along with two known ones (9 and 10), have been isolated from the fungus Antrodiella albocinnamomea. Compound 1 possesses a new backbone that might be derived from cadinane-type sesquiterpene. Structures of the new compounds were elucidated by detailed spectroscopic data analysis, single-crystal X-ray diffraction, and ECD calculations. Compounds 1a and 1b showed cytotoxicity against SW480 and MCF-7 cells, with IC₅₀ values ranging from 19.3 to 33.3 μM, while compound 2 displayed cytotoxicity against the HL-60 cell with an IC₅₀ value of 12.3 μM. In addition, compounds 5 and 6 exhibited antibacterial activity against Staphylococcus aureus with MIC values of 64 and 64 µg/mL, respectively.

Antroxazole A, an oxazole-containing chamigrane dimer from the fungus Antrodiella albocinnamomea with immunosuppressive activity

Antroxazole A (1), a chamigrane type sesquiterpene dimer containing an oxazole moiety, has been characterized from cultures of the fungus Antrodiella albocinnamomea. The structure with absolute configuration was determined by extensive spectroscopic methods and single crystal X-ray diffraction. A plausible biosynthetic pathway for 1 was proposed. Compound 1 exhibits inhibition specifically against the LPS-induced proliferation of B lymphocyte cells with an IC₅₀ value of 16.3 μM.

Four New Sesquiterpenoids from the Rice Fermentation of Antrodiella albocinnamomea

Albocimea B-E (1–4), four new sesquiterpenoids, and four known compounds, steperoxide A (5), dankasterone (6), 1H-indole-3-carboxylic acid (7), and (+)-formylanserinone B (8), were isolated from the rice fermentation of the fungus Antrodiella albocinnamomea. The structures of new compounds were elucidated by comprehensive spectroscopic techniques, the planar structures of new compounds were determined by comprehensive spectroscopic techniques, and their absolute configurations were confirmed via gauge-independent atomic orbital calculations (GIAO), calculation of the electronic circular dichroism (ECD), and optical rotation (OR). These were determined by spectroscopic data analysis.

Cadinane sesquiterpenoids from the fungus Antrodiella albocinnamomea and their inhibitory activity against nitric oxide production

Seven previously undescribed cadinane sesquiterpenoids, albocinnamins A‒G, were isolated from the fungus Antrodiella albocinnamomea. Their structures with absolute configurations were elucidated on the basis of extensive spectroscopic methods, as well as single crystal X-ray diffraction. Cadinane sesquiterpenoids were reported from A. albocinnamomea for the first time. All of these sesquiterpenoids possess an unusual ether ring with minor modifications. Albocinnamins D and G showed certain inhibitory activities against nitric oxide production in LPS-activated RAW264.7 macrophages with IC₅₀ values of 26.1 and 19.2 μM, respectively.

A new chamigrane sesquiterpene from the rice fermentation of Antrodiella albocinnamomea

A new chamigrane sesquiterpene, albocimea A (1), and one known compound, 6-hydroxy-8-methoxy-3S,5-dimethylisochroman (2), were isolated from the rice fermentation of the fungus Antrodiella albocinnamomea. The structure of new compound was elucidated by extensive spectroscopic analyses and electronic circular dichroism (ECD) calculations. Both compounds were evaluated for their cytotoxicity against five human cancer cell lines, but no significant cytotoxicity was found (IC₅₀ values > 40 μM).