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Strain KMM 9513T was isolated from a sediment sample collected from the Sea of Japan seashore and selected due to its ability to inhibit indicator bacterial growth. The strain KMM 9513T has been recently described as a novel species Rheinheimera japonica. This study was undertaken to determine which substances produced by strain KMM 9513T could be responsible for its antimicrobial activity. Eight compounds were obtained from an ethyl acetate extract of R. japonica KMM 9513T. The structures of five diketopiperazines (4?8) and diisobutyl-, dibutyl- and bis(2-ethylhexyl) phthalates (1?3) were established on the basis of detailed interpretation of NMR data, by Marfey method and optical rotation data. The structures of diketopiperazines were determined as cyclo-(l-valyl-l-proline), cyclo-(l-valyl-d-proline), cyclo-(l-phenylalanyl-l-proline), cyclo-(l-leucyl-l-proline), and cyclo-(l-phenylalanyl-d-proline). Compounds 1?3, 5 and 8 revealed antimicrobial activities against Bacillus subtilis and/or Enterococcus faecium and Staphylococcus aureus. In this paper, we describe the isolation and structural elucidation of the isolated compounds 1?8. This is the first report of the characterisation of low molecular weight antibacterial metabolites produced by a member of the genus Rheinheimera.
Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Recommanded Product: 344-25-2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 344-25-2, in my other articles.
Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI