4.6 Article

Bioactive Polyketide and Diketopiperazine Derivatives from the Mangrove-Sediment-Derived Fungus Aspergillus sp. SCSIO41407

Journal

MOLECULES
Volume 26, Issue 16, Pages -

Publisher

MDPI
DOI: 10.3390/molecules26164851

Keywords

mangrove-sediment-derived fungus; Aspergillus; polyketides; diketopiperazines; NF-kappa B; acetylcholinesterase

Funding

  1. Key-Area Research and Development Program of Guangdong Province [2020B1111030005]
  2. Finance Science and Technology Project of Hainan Province [ZDKJ202018]
  3. Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) [GML2019ZD0406]
  4. National Natural Science Foundation of China [U20A20101, 81973235, 21977102]
  5. K. C. Wong Education Foundation [GJTD-2020-12]
  6. Guangdong Local Innovation Team Program [2019BT02Y262]
  7. Guangdong Basic and Applied Basic Research Foundation [2019B151502042]

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In this study, ten polyketide derivatives and five known diketopiperazines were isolated from a mangrove-sediment-derived fungus. Compound 3 showed weak cytotoxicity against the A549 cell line, while compound 2 exhibited weak antibacterial activity against MRSA. In silico molecular docking indicated that compounds 1, 11-14 showed significant protein/ligand-binding effects to the NF-kappa B p65 protein.
Ten polyketide derivatives (1-10), including a new natural product named (E)-2,4-dihydroxy-3-methyl-6-(2-oxopent-3-en-1-yl) benzaldehyde (1), and five known diketopiperazines (11-15), were isolated from the mangrove-sediment-derived fungus Aspergillus sp. SCSIO41407. The structures of 1-15 were determined via NMR and MS spectroscopic analysis. In a variety of bioactivity screening, 3 showed weak cytotoxicity against the A549 cell line, and 2 exhibited weak antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA). Compounds 3, 5, and 6 showed inhibition against acetylcholinesterase (AChE) with IC50 values of 23.9, 39.9, and 18.6 mu M. Compounds 11, 12, and 14 exhibited obvious inhibitory activities of lipopolysaccharide (LPS)-induced nuclear factor-kappa B (NF-kappa B) with IC50 values of 19.2, 20.9, and 8.7 mu M, and they also suppressed RANKL-induced osteoclast differentiation in bone marrow macrophages cells (BMMCs), with the concentration of 5 mu M. In silico molecular docking with AChE and NF-kappa B p65 protein were also performed to understand the inhibitory activities, and 1, 11-14 showed obvious protein/ligand-binding effects to the NF-kappa B p65 protein.

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