Bioactive Chemical Constituents of a Sterile Endophytic Fungus from Meliotus dentatus

Chemical and biological investigations of the endophytic fungus of an unidentified Ascomycete, isolated from Meliotus dentatus led to the isolation of six known polyketide metabolites (1–6) and two steroids (7 and 8). Compounds 1–3, and 5 were tested for antibacterial, antialgal and antifungal activities. Compounds 2, 3, and 5 showed good activity against the alga Chlorella fusca, while compounds 2 and 3 were active against the Gram negative bacterium Escherichia coli and compounds 3 and 5 also against the Gram positive Bacillus megaterium. Similarly, compounds 3 and 5 also showed antifungal activity against Microbotryum violaceum.