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ORIGINAL ARTICLE
Year : 2014  |  Volume : 10  |  Issue : 40  |  Page : 410-414

Two new cyclopeptides from the co-culture broth of two marine mangrove fungi and their antifungal activity


1 Department of Applied Chemistry, College of Science, South China Agricultural University, Guangzhou 510642, China
2 Department of Pharmacognosy and Research, Institute of Pharmaceutical Sciences, School of Pharmacy, The University of Mississippi, Mississippi University, 38677, Mississippi, USA

Correspondence Address:
Chunyuan Li
Department of Applied Chemistry, College of Science, South China Agricultural University, Guangzhou 510642
China
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Source of Support: The National Natural Science Foundation of China (21102049), the Natural Science Foundation of Guangdong Province (9451064201003751), the Science and Technology Project of Guangzhou City (11C12100771), the Key Academic Program of the 3rd Phase “211 Project” of South China Agricultural University (2009B010100001), the national scholarship fund for studying abroad of China (for Dr. Chunyuan Li, No. 201208440268), Conflict of Interest: None


DOI: 10.4103/0973-1296.141781

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Background: The strategy that co-cultivation two microorganisms in a single confined environment were recently developed to generate new active natural products. In the study, two new cyclic tetrapeptides, cyclo (D-Pro-L-Tyr-L-Pro-L-Tyr) (1) and cyclo (Gly-L-Phe-L-Pro-L-Tyr) (2) were isolated from the co-culture broth of two mangrove fungi Phomopsis sp. K38 and Alternaria sp. E33. Their antifungal activity against Candida albicans, Gaeumannomyces graminis, Rhzioctonia cerealis, Helminthosporium sativum and Fusarium graminearum was evaluated. Materials and Methods: Different column chromatographic techniques with different solvent systems were used to separate the constituents of the n-butyl alcohol extract of the culture broth. The structures of compounds 1 and 2 were identified by analysis of spectroscopic data (one-dimensional, two-dimensional - nuclear magnetic resonance, mass spectrometry) and Marfey's analytic method. Dilution method was used for the evaluation of antifungal activity. Results: Compounds 1 and 2 were identified as cyclo (D-Pro-L-Tyr-L-Pro-L-Tyr) and cyclo (Gly-L-Phe-L-Pro-L-Tyr), respectively. Compounds 1 and 2 showed moderate to high antifungal activities as compared with the positive control. Conclusions: Compounds 1 and 2 are new cyclopeptides with moderate antifungal activity being worthy of consideration for the development and research of antifungal agents.


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