title: Microbial transformation of terreusinone, an ultraviolet-A (UV-A) protecting dipyrroloquinone, by Streptomyces sp.
abstract: Biotransformation study was conducted on the marine dipyrroloquinone, terreusinone (1) isolated from the marine-derived fungus Aspergillus terreus. Preparative-scale fermentation of terreusinone with Streptomyces sp. has resulted in the isolation of a new oxidized metabolite, terreusinol (2). The structure was elucidated as 2-[(1R)-1-hydroxyisobutyl]-6-[(1R)-1,2-dihydroxyisobutyl]-1H,5H-pyrrolo[2,3-b]indole-4,8-dione (2) on the basis of physicochemical evidence. Terreusinol (2) showed an ultraviolet-A (UV-A) (320-390 nm) protecting activity with ED(50) values of 150 microM, which is more active than oxybenzone (ED(50), 350 microM) currently being used as sunscreen.
authors.affiliation: Department of Chemistry, Pukyong National University, Busan, Korea.
authors.forename: XiFeng
authors.initials: X
authors.lastname: Li
authors.forename: Sang Mi
authors.initials: SM
authors.lastname: Lee
authors.forename: Hong Dae
authors.initials: HD
authors.lastname: Choi
authors.forename: Jung Sook
authors.initials: JS
authors.lastname: Kang
authors.forename: Byeng Wha
authors.initials: BW
authors.lastname: Son
mesh_terms: D001230:Aspergillus / Q000737:chemistry*; D001711:Biotransformation; D005285:Fermentation; D011809:Quinones / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D013302:Streptomyces / Q000378:metabolism*; D013473:Sunscreening Agents / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D014466:Ultraviolet Rays / Q000009:adverse effects*; D035962:Zosteraceae / Q000382:microbiology*
chemical_list: D011809:Quinones; D013473:Sunscreening Agents