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Mar. Drugs 2011, 9(4), 535-542; doi:10.3390/md9040535
Communication

Effects of High Salt Stress on Secondary Metabolite Production in the Marine-Derived Fungus Spicaria elegans

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,
 and
*
Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
* Author to whom correspondence should be addressed.
Received: 23 February 2011 / Revised: 11 March 2011 / Accepted: 30 March 2011 / Published: 31 March 2011
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Abstract

To obtain structurally novel and bioactive natural compounds from marine-derived microorganisms, the effect of high salt stress on secondary metabolite production in the marine-derived fungal strain, Spicaria elegans KLA-03, was investigated. The organism, which was isolated from marine sediment, produced different secondary metabolites when cultured in 3% and 10% saline conditions. Four characteristic metabolites, only produced in the 10% salinity culture, were isolated, and their structures were identified as (2E,2'Z)-3,3'-(6,6'-dihydroxybiphenyl-3,3'-diyl)diacrylic acid (1), aspulvinone E (2), aspochalasin E (3) and trichodermamide B (6), according to their 1D and 2D NMR spectra. Compound 1 is a new compound. High salt stress may therefore be a promising means to induce the production of new and chlorinated compounds in halotolerant fungi. Compound 1 showed moderate antibacterial activity against Pseudomonas aeruginosa and Escherichia coli with minimum inhibitory concentration (MIC) values of 0.038 and 0.767 mM, respectively.
Keywords: Spicaria elegans; high salt stress; secondary metabolites Spicaria elegans; high salt stress; secondary metabolites
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Wang, Y.; Lu, Z.; Sun, K.; Zhu, W. Effects of High Salt Stress on Secondary Metabolite Production in the Marine-Derived Fungus Spicaria elegans. Mar. Drugs 2011, 9, 535-542.

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