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      Bioprospecting of antimicrobial activity of extracts of endophytic fungi from Bauhinia guianensis Translated title: Bioprospección de la actividad antimicrobiana de los extractos de los hongos endófitos de Bauhinia guianensis

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          Abstract

          Antibiotic resistance results in higher medical costs, prolonged hospital stays and increased mortality and is rising to dangerously high levels in all parts of the world. Therefore, this study aims to search for new antimicrobial agents through bioprospecting of extracts of endophytic fungi from Bauhinia guianensis, a typical Amazonian plant used in combating infections. Seventeen (17) fungi were isolated and as result the methanolic extract of the fungus Exserohilum rostratum showed good activity against the bacteria tested. The polyketide monocerin was isolated by the chromatographic technique, identified by NMR and MS, showing broad antimicrobial spectrum.

          Translated abstract

          La resistencia a los antibióticos conduce a mayores costos médicos, hospitalizaciones prolongadas e incremento de la mortalidad, y está aumentando a niveles peligrosamente altos en todas partes del mundo. Este estudio tuvo como objetivo la búsqueda de nuevos agentes antimicrobianos a través de la bioprospección de extractos de hongos endófitos de Bauhinia guianensis, una planta amazónica típica, utilizada en la lucha contra problemas infecciosos. Fueron aislados 17 hongos; el extracto metanólico del hongo Exserohilum rostratum mostró buena actividad contra las bacterias probadas. Se aisló monocerina policétido por la técnica de cromatografía; este compuesto fue identificado por RM y EM, y mostró un amplio espectro antimicrobiano.

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          Most cited references13

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          Natural products from endophytic microorganisms.

          Endophytic microorganisms are to be found in virtually every plant on earth. These organisms reside in the living tissues of the host plant and do so in a variety of relationships ranging from symbiotic to pathogenic. Endophytes may contribute to their host plant by producing a plethora of substances that provide protection and ultimately survival value to the plant. Ultimately, these compounds, once isolated and characterized, may also have potential for use in modern medicine, agriculture, and industry. Novel antibiotics, antimycotics, immunosuppressants, and anticancer compounds are only a few examples of what has been found after the isolation and culturing of individual endophytes followed by purification and characterization of some of their natural products. The prospects of finding new drugs that may be effective candidates for treating newly developing diseases in humans, plants, and animals are great. Other applications in industry and agriculture may also be discovered among the novel products produced by endophytic microbes.
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            Bioactive isocoumarins isolated from the endophytic fungus Microdochium bolleyi.

            Three new isocoumarin derivatives ( 2- 4) were isolated together with monocerin ( 1) from Microdochium bolleyi, an endophytic fungus from Fagonia cretica, a herbaceous plant of the semiarid coastal regions of Gomera. Compounds 2 and 3 are both 12-oxo epimers of 1, and 4 is a ring-opened derivative of 1. The structures were elucidated by detailed spectroscopic analysis and comparison with reported data. The absolute configurations were determined by a modified Mosher's method. Compounds 1, 3, and 4 showed good antifungal, antibacterial, and antialgal activities against Microbotryum violaceum, Escherichia coli, Bacillus megaterium, and Chlorella fusca. Compound 2 was moderately antifungal and antialgal.
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              CR377, a new pentaketide antifungal agent isolated from an endophytic fungus.

              Cultures of endophytic fungi collected in the Guanacaste Conservation Area of Costa Rica were screened for antifungal activity. CR377, a new pentaketide antifungal agent, was isolated from the culture broth of a fungus, CR377 (Fusarium sp.), that showed potent activity against Candida albicans in this assay. The structure of CR377 was established using 1- and 2-D NMR and HRFABMS.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                ram
                Revista argentina de microbiología
                Rev. argent. microbiol.
                Asociación Argentina de Microbiología (Ciudad Autónoma de Buenos Aires, , Argentina )
                0325-7541
                1851-7617
                March 2017
                : 49
                : 1
                : 3-6
                Affiliations
                [01] Belém Pará orgnameUniversidade Federal do Pará orgdiv1Instituto de Ciências Exatas e Naturais orgdiv2Programa de Pós-graduação em Química, Rua Augusto Corrêa Brazil
                Article
                S0325-75412017000100002
                10.1016/j.ram.2016.08.005
                24901d4f-4e4b-4898-b198-4fb96c45609e

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 10 January 2016
                : 19 August 2016
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 15, Pages: 4
                Product

                SciELO Argentina


                Monocerin,Actividad antimicrobiana,Hongos endófitos,Bauhinia guianensis,Monocerin; Antimicrobial activity,Endophytic fungi

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