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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(H 8 ) and MK9(H 6 ). Phylogenetic analysis indicated that closely related strains include  Streptomyces rhizophilus  NBRC 108885 T  (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 ).

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