Production of an antimicrobial cytochalasan by an endophytic Chaetomium globosum HYML55 from Hypericum mysorense and its RNA secondary structure analysis

Samaga, P. V. and Rai, V. Ravishankar and Rai, K. M. Lokanatha (2014) Production of an antimicrobial cytochalasan by an endophytic Chaetomium globosum HYML55 from Hypericum mysorense and its RNA secondary structure analysis. Chemistry and Ecology, 30 (6). pp. 566-578. ISSN 0275-7540

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Abstract

The mutualistic benefits and disadvantages of non-clavicipitaceous endophytes for their hosts are not well studied and are postulated as being distinct from free-living or pathogenic counterparts. The defensive metabolites and antioxidants produced by endophytes are postulated to be the benefits offered for the hosts. Therefore, the antimicrobial and free-radical-scavenging activities of a foliar endophyte Chaetomium globosum HYML55 isolated from Hypericum mysorense of Western Ghats, India were studied. RNA secondary structure analysis refuted the unique biotope postulation because strain HYML55 was more similar to a coprophilous strain than to endophytic strains. Ethyl acetate extract of the fungus inhibited bacteria and fungi. The extract also quenched 98.65% 1,1-diphenyl- 2-picrylhydrazyl radicals with total antioxidant capacity of 13.62 mg ascorbic acid equivalent/g. A yellow amorphous antimicrobial compound purified from the extract was identified as chaetoglobosin F, which had a minimum inhibitory concentration of 7.8-15.6 μg/mL, except against Pseudomonas aeruginosa. This is the first report on the antimicrobial activity of chaetoglobosin F and other bioactivities of any endophytes from H. mysorense. The study emphasises the inter-habitat cycling of endophytes and possible benefits of C. globosum for the host. Chaetoglobosin F is an anti-inflammatory and anti-neoplastic compound, and C. globosum HYML55 could be exploited for the industrial production of this compound.

Item Type:	Article
Uncontrolled Keywords:	antioxidant, India, Fungi, bacterium, Western Ghats, fungus, toxin, antimicrobial activity, Pseudomonas aeruginosa, RNA, endophyte, genetic analysis, free radical, Bacteria (microorganisms), Chaetomium globosum, Coprophilous, genetic structure, Hypericum
Subjects:	B Life Science > Microbiology C Chemical Science > Chemistry
Divisions:	Department of > Chemistry Department of > Microbiology
Depositing User:	Arshiya Kousar Library Assistant
Date Deposited:	23 Aug 2019 05:48
Last Modified:	13 Jan 2023 10:41
URI:	http://eprints.uni-mysore.ac.in/id/eprint/4360

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