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Bioactive Compounds from the Scale Insect Pathogenic Fungus Conoideocrella tenuis BCC 18627

A new cyclohexadepsipeptide, conoideocrellide A (1), its linear derivatives, conoideocrellides B-D (2-4), three new hopane triterpenoids (5-7), two new bioxanthracenes (9 and 10), and a new isocoumarin glycoside (13) were isolated from the scale insect pathogenic fungus Conoideocrella tenuis BCC 18627. Biological activities of the new compounds were evaluated.

Hopane-type triterpenes and binaphthopyrones from the scale insect pathogenic fungus Aschersonia paraphysata BCC 11964.

Two new triterpenes, 17(21)-hopene-6alpha,12beta-diol (1) and 17(21)-hopen-12beta-ol (2), the known 17(21)-hopen-6alpha-ol (zeorinin, 3), and two new biarylic dihydronaphthopyrones, aschernaphthopyrones A (4) and B (5), were isolated from the scale insect pathogenic fungus Aschersonia paraphysata BCC 11964. Hopene 1 and aschernaphthopyrone A (4) exhibited antimalarial activity with IC(50) values of 15 and 7.3 microM, respectively.

Cadinane sesquiterpenoids from the basidiomycete Stereum cf. sanguinolentum BCC 22926.

Stereumins Q-U, together with known stereumins A, B, K, L, and N, as well as ent-strobilols E and G were isolated from the culture of Stereum cf. sanguinolentum BCC 22926. Their structures were elucidated by extensive spectroscopic analyses. The absolute configurations of stereumins A and Q, as well as ent-strobilol E were established by application of the modified Moshers method. Stereumin T displayed antibacterial activity against Bacilluscereus with a MIC value of 3.97μM.

Phenolic Glycosides from the Filamentous Fungus Acremonium sp. BCC 14080

New phenolic mono- and digalactopyranosides (1 and 2), their aglycone KS-501a (3), and a new phenolic 4-O-methylglucopyranoside (4) were isolated from the filamentous fungus Acremonium sp. BCC 14080. Structures of these compounds were elucidated by extensive MS and NMR spectroscopic analyses. Compound 1 displayed anti-HSV-1 activity with an IC(50) value of 7.2 microM. Compound 3 exhibited activity against Plasmodium falciparum K1 with an IC(50) value of 9.9 microM.

Alliacane sesquiterpenoids from submerged cultures of the basidiomycete Inonotus sp. BCC 22670

Nine alliacane sesquiterpenoids, inonoalliacanes A-I, were isolated from culture broth of the basidiomycete Inonotus sp. BCC 22670. The structures were elucidated on the basis of NMR spectroscopic and mass spectrometry data. The absolute configuration of inonoalliacane F was determined by application of the modified Moshers method. Inonoalliacane A, the most abundant sesquiterpene constituent, exhibited moderate antibacterial activity against Bacillus cereus, whereas inonoalliacane B showed antiviral activity against herpes simplex virus type 1.