Presence of antioxidative agent, Pyrrolo[1,2-a]pyrazine-1,4-dione, hexahydro- in newly isolated Streptomyces mangrovisoli sp. nov.

A novel Streptomyces, strain MUSC 149^T was isolated from mangrove soil. A polyphasic approach was used to study the taxonomy of MUSC 149^T, which shows a range of phylogenetic and chemotaxonomic properties consistent with those of the members of the genus Streptomyces. The diamino acid of the cell wall peptidoglycan was LL-diaminopimelic acid. The predominant menaquinones were identified as MK9(H₈) and MK9(H₆). Phylogenetic analysis indicated that closely related strains include Streptomyces rhizophilus NBRC 108885T (99.2% sequence similarity), S. gramineus NBRC 107863^T (98.7%) and S. graminisoli NBRC 108883^T (98.5%). The DNA-DNA relatedness values between MUSC 149^T and closely related type strains ranged from 12.4 ± 3.3% to 27.3 ± 1.9%. The DNA G + C content was determined to be 72.7 mol%. The extract of MUSC 149^T exhibited strong antioxidant activity and chemical analysis reported identification of an antioxidant agent, Pyrrolo[1,2-a]pyrazine-1,4-dione, hexahydro-. These data showed that metabolites of MUSC 149^T shall be useful as preventive agent against free-radical associated diseases. Based on the polyphasic study of MUSC 149^T, the strain merits assignment to a novel species, for which the name S. mangrovisoli sp. nov. is proposed. The type strain is MUSC 149^T (=MCCC 1K00699^T=DSM 100438^T).