Anais da Academia Brasileira de Ciências ISSN: 0001-3765 [email protected] Academia Brasileira de Ciências Brasil

M.C. DE SOUZA, ELEANE; L. DA SILVA, ELLON; MARINHO, ANDREY M.R.; MARINHO, PATRÍCIA S.B. (4S)-4,8-dihydroxy-1-tetralone and other chemical constituents from Pestalotiopsis sp. EJC07, endophytic from Bauhinia guianensis Anais da Academia Brasileira de Ciências, vol. 88, núm. 1, marzo, 2016, pp. 29-33 Academia Brasileira de Ciências Rio de Janeiro, Brasil

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(4S)-4,8-dihydroxy-1-tetralone and other chemical constituents from Pestalotiopsis sp. EJC07, endophytic from Bauhinia guianensis

ELEANE M.C. DE SOUZA, ELLON L. DA SILVA, ANDREY M.R. MARINHO and PATRÍCIA S.B. MARINHO

Faculdade de Química, Universidade Federal do Pará, UFPA, Rua Augusto Corrêa, 01, Guamá, 66075-110 Belém, PA, Brasil

Manuscript received on July 7, 2014; accepted for publication on July 13, 2015

ABSTRACT The present work reports the isolation of eight compounds from Pestalotiopsis sp. EJC07 isolated as endophytic from Bauhinia guianensis, a tipical plant of the Amazon. The compounds (4S)-4,8-dihydroxy- 1-tetralone (1), uracil (2), uridin (3), p-hydroxybenzoic acid (4), (5), ergosterol peroxide (6), cerevisterol (7) and ducitol (8) were isolated by chromatographic procedures and identifi ed by spectral methods of 1D and 2D NMR and MS. The compound 1 is being reported for the fi rst time in the genus Pestalotiopsis. Key words: B. guianensis, endophityc , Pestalotiopsis, tetralone.

INTRODUCTION where their metabolism is potentiated and, still producing a wide variety of secondary metabolites The endophytic microorganisms live in the internal with the most diverse activities (Marinho et al. tissues of plants without causing apparent diseases 2005). to their hosts (Petrini et al. 1992). In the tropical Fungi of the Pestalotiopsis genus are broadly and temperate forests, covering only 1.44% of the terrestrial surface, there are approximately distributed, occurring in soil, seeds, fruits and leafs, 300,000 (three hundred thousand) plant species can be parasite, endophytic or saprobes (Jeewon et so far analyzed, home to more than 60% of the al. 2004). Frequently endophytic association has world biodiversity (Strobel et al. 2004). As a been described to Pestalotiopsis generally found result, the opportunity to fi nd new microorganisms in subtropical and tropical regions (Wei and Xu and producers of bioactive compounds for 2004, Strobel and Daisy 2003). There are many agriculture, industry and medicine has increased reports of the metabolites secondary produced the bioprospection of this microbiota of great by Pestalotiopsis with biological activity and importance in biotechnology (Strobel 2002). biotechnological applicability (Strobel and Long Fungi generally are characterized by rapid 1998, Li et al. 2005). growth of their colonies, adapting to various culture Thus, we decided study the biomass produced media, mostly in cereals such as rice and corn, by endophytic fungus Pestalotiopsis sp. EJC07

Correspondence to: Patrícia Santana Barbosa Marinho isolated from Bauhinia guianensis and this work E-mail: [email protected] led to the isolation of the eight known compounds

An Acad Bras Cienc (2016) 88 (1) 30 ELEANE M.C. DE SOUZA, ELLON L. DA SILVA, ANDREY M.R. MARINHO and PATRÍCIA S.B. MARINHO biologically active (Figure 1). The (4S)-4,8- MICROORGANISM dihydroxy-1-tetralone is being reported the fi rst Pestalotiopsis sp. was obtained from a collection of time in the Pestalotiopsis genus. the Laboratório de Bioensaios e Química de Micro-

MATERIALS AND METHODS organismos (LaBQuiM), Faculdade de Química - Universidade Federal do Pará. This collection GENERAL PROCEDURES contains isolates from Bauhinia guianensis. One strain is deposited in the LaBQuiM with the code ESIMS data were acquired in positive and negative EJC07. mode using a Waters Acquity TQD instrument. 1D and 2D NMR spectra were recorded on a Varian CULTURE OF Pestalotiopsis sp. IN RICE AND CHEMICAL Mercury 300, using solvent signal as reference. CONSTITUENTS ISOLATION The chemical shifts are given in delta (δ) values Twenty-two Erlenmeyer flasks (1,000 mL) and the coupling constants (J) in Hertz (Hz). containing 200 g rice (Tio João®) and 125 mL

PLANT MATERIAL distilled water per fl ask were autoclaved for 45 min at 121°C. Small cubes of PDA medium containing Bauhinia guianensis was collected in the city mycelium of Pestalotiopsis sp. EJC07 were added of Belém-PA and a voucher specimen (number in 20 Erlenmeyer fl asks under sterile condition. 177.179) was deposited at the Herbarium of Two flasks were used as control. After 30 days Empresa Brasileira de Pesquisa Agropecuária of growth at 25°C the biomass obtained was (EMBRAPA). macerated with , and methanol.

Figure 1 - Compounds isolated from Pestalotiopsis sp. EJC07.

An Acad Bras Cienc (2016) 88 (1) (4S)-4,8-DIHYDROXY-1-TETRALONE AND OTHER 31

The ethyl acetate was evaporated under reduced to the sp3 carbons. The analysis of the specific D pressure, producing a yellowish residue (8.9 g). rotation showed [α] +12,6 (CH2Cl2, 0,00116) to After successive fractionations the ethyl acetate the compound 1. The signals were attributed in the extract on silica gel chromatography column eluted base the HMBC, HSQC and COSY correlations. with hexane, ethyl acetate and methanol in polarity The spectral data were compared with the data gradient were obtained the compounds 1-8. described in the literature to (4S)-4,8-di-hydroxi- α-tetralone and showed total similarity (Zhu et al. RESULTS AND DISCUSSION 2008). According Inácio et al. (2006) the (4S)-4,8- di-hydroxi-1-tetralone showed antifungal activity CONSTITUENTS ISOLATED by bioautography test against Cladosporium The extract was submitted the chromatographic cladosporioides and C. sphaerospermum column on silica gel eluted with hexene, EtOAc comparable to the standard nystatin and interesting and MeOH given (4S)-4,8-dihydroxy-1-tetralone allelopathic activity (Li et al. 2012). (1), uracil (2), uridin (3), p-hydroxybenzoic The compounds 2, 3 and 4 showed as principal acid (4), ergosterol (5), ergosterol peroxide (6), characteristic two signals double doublet in the cerevisterol (7) and ducitol (8). All the compounds hydrogens aromatic region (δ 6.50 - δ 8.00) in their were identifi ed by 1D and 2D NMR methods and 1H NMR spectra. Then, the 1H and 13C NMR data comparison with literature data. were compared with the literature allowing identify them as uracil (2), uridin (3) and p-hydroxybenzoic CHEMICAL CONSTITUENTS IDENTIFICATION acid (4) (Marinho et al. 2007). The compounds The mass spectrum ESI(+) to 1 showed m/z = 179 2 and 3 are nitrogenous bases and show antiviral [M+H]+, that together with NMR data allowed activity (Pinto et al. 2002). 1 The compounds 5, 6 and 7 showed in their propose the molecular formula C10H10O3. The H 1 NMR spectrum to 1 showed signals characteristic H NMR spectra characteristics to steroidal to the aromatic ring at δ 7.49 (t, 8.0 Hz, H-6), δ compounds as the signals singlet and double duplet 7.02 (dt, 7.8, 0.9 e 0.9 Hz, H-5) and δ 6.92 (dd, in the methyl region at 0.60 to δ 1.20; methylene 8.1 and 1.0 Hz, H-7), a singlet signal at δ 12.41 hydrogens signals at δ 1.20 to δ 2.00; signals to typical of the chelated hydroxyl and a double duplet carbinolic hydrogens at δ 3.63 (m) to 5, δ 3.95 (m) signal at δ 4.92 with coupling constants of 7.4 and to 6 and δ 3.61 (m) and δ 4.07 (m) to 7; further 4.0 Hz attributed to the hydrogen H-4. Also was the signals to olefinics hydrogens at δ 5.15 to observed in the 1H NMR spectrum two signals ddd δ 5.20. These data together with 13C NMR data attributed to the diastereotopics hydrogens H-2 at δ to the compounds allowed identify them as the 3.00 (17.8, 8.2 and 4.7 Hz, H-2β) and δ 2.65 (17.8, steroids ergosterol (5), ergosterol peroxide (6) and 8.2 and 4.7 Hz, H-2α), it was also observed two cerevisterol (7) (Marinho et al. 2009). The steroid multiplets signals at δ 2.35 and δ 2.19 attributed to ergosterol and ergosterol peroxide have signifi cant the hydrogens H-3β e H-3α, respectively. anticancer activity (Kawagishi et al. 1988). In the 13C NMR observed 10 signals to car- Already the compound 8 showed only signals to bons, being six signals referents to the aromatic carbinolic hydrogens in their 1H NMR spectrum. carbons (δ 162.7, δ 145.8, δ 137.0, δ 117.8, δ 117.3 The comparison the 1H and 13C data of the 8 with and δ 115.2), one signal at δ 204.2 attributed to the literature allowed identify as ducitol (Marinho the carbonyl carbon (C-1), the signal at δ 67.7 et al. 2007). was attributed to the carbinolic carbon (C-4) and The chemical study of the endophytic fungus the signals at δ 34.6 and δ 31.2 were attributed Pestalotiopsis sp. EJC07 led to the isolation of eight

An Acad Bras Cienc (2016) 88 (1) 32 ELEANE M.C. DE SOUZA, ELLON L. DA SILVA, ANDREY M.R. MARINHO and PATRÍCIA S.B. MARINHO biologically active compounds and the (4S)-4,8-di- LH AND ARAÚJO AR. 2006. Antifungal metabolites from hydroxi-1-tetralone is being reported for the fi rst Colletotrichum gloeosporioides, an endophytic fungus in Cryptocarya mandioccana Nees (Lauraceae). Biochem time in the genus Pestalotiopsis. This compound Syst Ecol 34: 822-824. have been isolated of other fungi such as Sclerotinia JEEWON R, LIEW ECY AND HYDE KD. 2004. Phylogenetic sclerotiorum (Morita and Aoki 1974), Cytospora evaluation of species nomenclature of Pestalotiopsis in eucalypticola (Kokubun et al. 2003), Caryospora relation to host association. Fungal Divers 17: 39-55. callicarpa (Zhu et al. 2008), Aspergillus fumigatus KAWAGISHI H, KATSUMI R, SAZAWA T, MIZUNO T, HAGIWARA T AND NAKAMURA T. 1988. Cytotoxic Steroids from the (Li et al. 2012) and Paraconiothyrium variabile Mushroom Agaricus blazei. Phytochemistry 27: 2777- (Prado et al. 2013) and from plants belonging to 2779. the family Juglandaceae (Li et al. 2014, Talapatra KOKUBUN T, VEITCH NC, BRIDGE PD AND SIMMONDS et al. 1988). (4S)-4,8-dihydroxy-1-tetralone, a MSJ. 2003. Dihydroisocoumarins and a tetralone from Cytospora eucalypticola. Phytochemistry 62: 779-782. dihydronaphthalenone, has a particular interest LI H, QING C, ZHANG Y AND ZAHO Z. 2005. ScreenIng for as building blocks for more complex natural endophytic fungi with antitumour and antifungal activities compounds featuring a spirobisnaphthalene from Chinese medicinal plants. World J Microbiol structure (Prado et al. 2013). Biotechnol 21: 1515-1519. LI XJ, ZHANG Q, ZHANG AL AND GAO JM. 2012. Metabolites from Aspergillus fumigatus, an endophytic fungus ACKNOWLEDGMENTS associated with Melia azedarach, and their antifugal, The authors thank the Fundação Amazônia de antifeedant, and toxic activities. J Agric Food Chem 60: 3424-3431. Amparo a Estudos e Pesquisas do Pará (FAPESPA), LI XX, YU MF, RUAN X, ZHANG YZ AND WANG Q. 2014. Conselho Nacional de Desenvolvimento Científi co Phytotoxicity of 4,8-dihydroxy-1-tetralone isolated e Tecnológico (CNPq) and Coordenação de from Carya cathayensis Sarg. to various plant species. Aperfeiçoamento de Pessoal de Ensino Superior Molecules 19: 15452-15467. MARINHO AMR, RODRIGUES-FILHO E, MOITINHO MLR (CAPES) for the fi nancial support, Secretaria de AND SANTOS LS. 2005. Biologically active polyketides Estado de Educação do Pará (SEDUC) for the produced by Penicilium janthinellum isolated as an research scholarship. endophytic fungus fruit of Melia azedarach. J Braz Chem Soc 16: 280-283. RESUMO MARINHO AMR, MARINHO PSB AND RODRIGUES FILHO E. 2007. Constituintes Químicos de Penicillium sp, um Fungo O presente trabalho reporta o isolamento de oito Endofítico Isolado de Murraya paniculata (Rutaceae). compostos de Pestalotiopsis sp. EJC07 isolado como RECEN 9: 189-199. MARINHO AMR, MARINHO PSB AND RODRIGUES FILHO E. endofítico de Bauhinia guianensis, uma planta típica da 2009. Esteroides produzidos por Penicillium herquei, um Amazônia. Os compostos (4S)-4,8-diidroxi-1-tetralona fungo endofítico isolado dos frutos de Melia azedarach (1), uracila (2), uridina (3), ácido p-hidroxibenzoico (4), (Meliaceae). Quim Nova 32: 1710-1712. ergosterol (5), peróxido de ergosterol (6), cerevisterol MORITA T AND AOKI H. 1974. Isosclerone, a new metabolite (7) e ducitol (8) foram isolados por procedimentos of Sclerotinia sclerotiorum (LIB.) De Bary. Agric Biol cromatográfi cos e identifi cados por métodos espectrais Chem 50: 997-1001. de RMN 1D e 2D e EM. O composto 1 está sendo PRADO S, BUISSON D, NDOYE I, VALLET M AND NAY B. 2013. One-step enantioselective synthesis of (4S)- reportado pela primeira vez no gênero Pestalotiopsis. isosclerone through biotranformation of juglone by an Palavras-chave: B. guianensis, fungo endofítico, Pestalo- endophytic fungus. Tetrahedron Lett 54: 1189-1191. tiopsis, tetralona. PETRINI O, SIEBER TN, TOTI L AND VIRET O. 1992. Ecology, metabolite production, and substrate utilization in REFERENCES endophytic fungi. Natural Toxins 1: 185-196. PINTO AC, SILVA DHS, BOLZANI VS, LOPES NP AND INÁCIO ML, SILVA GH, TELES HL, TREVISAN HC, EPIFANIO RA. 2002. Produtos naturais: atualidade, CAVALHEIRO AJ, BOLZANI VS, YOUNG MCM, PFENNING desafios e perspectivas. Quim Nova 25: 45-61.

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