Butyrolactones and Diketopiperazines from Marine Microbes: Inhibition Effects on Dengue Virus Type 2 Replication

Abstract

Two new compounds, 4S,10R-dihydroxy-11-methyl-dodec-2-en-1,4-olide (1) (butyrolactone-type) and cyclo-(4-trans-6-dihydroxy-proline-D-leucine) (2) (diketopiperazine-type), as well as one known 4S,10-dihydroxy-10-methyl-dodec-2-en-1,4-olide (3) and three known diketopiperazines, cyclo-(L-proline-L-leucine) (4), cyclo-(4-trans-hydroxy-L-proline-L-leucine) (5), and cyclo-(4-trans-hydroxy-L-proline-L-phenylalanine) (6), were isolated from the ethyl acetate extracts of Streptomyces gougerotii GT and Microbulbifer variabilis C-03. Compounds 3, 4, 5, and 6 exhibited a significant reduction effect on dengue virus type 2 replication with EC₅₀ values of 21.2, 16.5, 12.3, and 11.2 µM, respectively.

Key words

Streptomyces gougerotii - Streptomycetaceae - Microbulbifer variabilis - Alteromonadaceae - Butyrolactone - diketopiperazine - dengue virus type 2 replication

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