Journal of Tropical Oceanography ›› 2024, Vol. 43 ›› Issue (4): 174-180.doi: 10.11978/2023122CSTR: 32234.14.2023122

• Exploitation of Marine Resources • Previous Articles     Next Articles

Study on the secondary metabolites from the Weizhou Island coral Acropora austera associated fungus Arachniotus ruber GXIMD 02510 and their antibacterial activity

WANG Jiaxi(), LU Humu, QI Xin, GAO Chenghai, LIU Yonghong, LUO Xiaowei()   

  1. Institute of Marine Drugs, Guangxi University of Chinese Medicine, Guangxi Key Laboratory of Marine Drugs, Nanning 530200, China
  • Received:2023-08-16 Revised:2023-09-03 Online:2024-07-10 Published:2024-07-22
  • Supported by:
    Natural Science Foundation of Guangxi(2024GXNSFFA999005); Natural Science Foundation of Guangxi(2021GXNSFDA075010); National Natural Science Foundation of China(U20A20101); High-Level Talent Training Project Foundation of Guangxi University of Chinese Medicine(202407); High-Level Talent Training Project Foundation of Guangxi University of Chinese Medicine(2022C038)

Abstract:

The secondary metabolites and antibacterial activities of the Weizhou Island coral Acropora austera associated fungus Arachniotus ruber GXIMD 02510 were investigated. Various modern chromatographic techniques were used to isolate and purify the fermentation products of this strain. Their structures were determined by comprehensive spectroscopic methods, including nuclear magnetic resonance and by comparison with literature data. The antibacterial activity was determined. A total of 13 compounds were obtained and characterized, which were auxarthrols B, E, F, and H (14), paradictyoarthrin A (5), chrysoqueen (6), ocauxarthrol A (7), 1, 3, 6-trihydroxy-8-methylxanthone (8), N-acetyltyramine (9), methyl 2-(4-hydroxyphenyl)acetate (10), m-hydroxylphenylacitic acid (11), L-tenuazonic acid (12), and 2, 3, 22, 23-tertrahydroxy-2, 6, 10, 15, 19, 23-hexamethyl-tetracosa-6, 10, 14, 18-tetraene (13). Antibacterial activity test showed that compounds 1, 46, and 11 showed inhibitory activity against Pseudomonas aeruginosa, and the minimum inhibitory concentration (MIC) values were ranging from 0.078 mg·mL-1 to 0.312 mg·mL-1. This study will expand the chemical diversity of the genus Arachniotus and also provide chemical entities for the development of antibiotics.

Key words: Weizhou Island, Acropora austera, Arachniotus ruber, secondary metabolites, antibacterial activity