Until now, relatively little is known about marine-derived fungal polysaccharides and their activities. Exopolysaccharide AVP141-A was isolated from the broth of marine-derived fungus Aspergillus versicolor SCAU141 and purified by Diethylaminoethyl-Sepharose Fast Flow and Sephadex G-100. The structural characteristics of AVP141-A was studied by chemical analysis together with high-performance gel permeation chromatography, ion chromatography, Fourier-transform infrared spectroscopy, gas chromatography-mass spectrometry and nuclear magnetic resonance spectroscopy. The results showed that AVP141-A with the molecular weight of 5.10 kDa was mainly composed of →4)-α-D-Glcp-(1→, branched by α-D-Glcp-(1→ and →6)-α-D-Glcp-(1→ at C-6 positions of the glucan backbone. In particular, sulfate ester (approximately 3.62 %) was found in AVP141-A, which was frequently considered to occur in marine-derived microbial polysaccharides rather than other microbial polysaccharides. Furthermore, AVP141-A significantly enhanced the activity of the inflammatory factors NO, COX-2 and TNF-α in RAW264.7 macrophages by activating the MAPK/p38 and NF-κB/p65 pathways. In addition, metabolomic analysis revealed that most of the pathways with significant changes in RAW264.7 macrophages treated with AVP141-A were amino acid-related pathways, and arginine was the characteristic metabolite. In conclusion, this study identified AVP141-A as a marine fungus-derived sulfated exopolysaccharide with potential for development as an immune activator.

marine-derived fungus, amino acid metabolism, RAW264.7 macrophages

• Compound ID: 23585
  

  a-D-Glcp-(1-6)-+ S-6)-a-D-Glcp-(1-6)-+ | | -4)-{{{-a-D-Glcp-(1-4)-}}}{{{-a-D-Glcp-(1-4)-a-D-Glcp-(1-4)-}}}/n=4/-{{{-a-D-Glcp-(1-4)-}}}{{{-a-D-Glcp-(1-4)-a-D-Glcp-(1-4)-}}}/n=2/-{{{-a-D-Glcp-(1-4)-}}}a-D-Glcp-(1-

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  Structure type: structural motif or average structure ; 5100
  Trivial name: polysaccharide AVP141-A
  Compound class: EPS
  
   
  
  Aspergillus versicolor SCAU141
  CSDB ID 41100 (all data & tools)