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Biotransformation of Bile Acids by Pathogenic Actinomycetes Nocardia Otitidiscaviarum and Amycolatopsis Sp

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Biotransformation of Bile Acids by Pathogenic Actinomycetes Nocardia Otitidiscaviarum and Amycolatopsis Sp J. Antibiot. 58(5): 356–360, 2005 THE JOURNAL OF NOTE [_ ANTIBIOTICSJ Biotransformation of Bile Acids by Pathogenic Actinomycetes Nocardia otitidiscaviarum and Amycolatopsis sp. Strains Akira Mukai, Katsukiyo Yazawa, Yuzuru Mikami, Ken-ichi Harada, Udo Gräfe Received: October 29, 2004 / Accepted: April 8, 2004 © Japan Antibiotics Research Association Abstract Three sterol-type compounds (compounds 4, 5 Detroit, USA), contain cholic acid and its derivatives: and 6) were isolated from culture broth of pathogenic cholic acid (1), taurocholic acid (2), and glycocholic acid Nocardia otitidiscaviarum IFM 0988 and Amycolatopsis (3) (Fig. 1). Furthermore, our screening studies of new sp. IFM 0703 strains which were isolated from Japanese metabolites of the cultured Nocardia and Amycolatopsis patients. The structures of the compounds were determined strains using a nutrient medium suggested the presence of by NMR and mass spectrometric analyses. The structural additional cholic acid related compounds, implying studies indicated that compound 4 is a biotransformation microbial conversion of cholic acid by pathogenic product from cholic acid derivative in a nutrient culture Nocardia. We isolated such compounds and designated medium constituent by a reductase-type enzyme, and them as compound 4 from N. otitidiscaviarum IFM 0988 the remaining two compounds 5 and 6 are also strain, and compounds 5 and 6 from Amycolatopsis sp. IFM biotransformation ones by oxidase-type enzymes. 0703 strain (Fig. 1). Subsequently, we elucidated their structures using physicochemical methods such as NMR Keywords Nocardia otitidiscaviarum, Amycolatopsis and MS. Our preliminary structural studies suggested that sp., biotransformation, cholic acid compound 4 was produced by enzymes such as reductases of N. otitidiscaviarum IFM 0988; compounds 5 and 6 are also produced by an oxidase type enzyme of Amycolatopsis sp. IFM 0703. Such a hypothesis was also supported by the fact that sterol-type compounds have never been reported Pathogenic actinomycete strains such as Nocardia as procaryotic metabolites. This paper describes the brasiliensis, N. asteroides and N. otitidiscaviarum invade isolation and structural elucidation of compounds 4, 5 and the human host by specific mechanisms of infections and 6 as new biotransformation products from pathogenic N. metabolize the host’s cellular constituents [1, 2]. However, otitidiscaviarum IFM 0988 and Amycolatopsis sp. IFM little information is available regarding the metabolism of 0703, respectively. special compounds by such pathogens [1, 2]. Nocardia species produce various bioactive secondary metabolites, Fermentation and Isolation some of which have various antifungal, antibacterial, and The seed broth was prepared by inoculating mycelial immunosuppressive activities [3, 4]. Our ongoing search elements of N. otitidiscaviarum IFM 0988 grown on for metabolites of Nocardia and related actinomycete Sabouraud dextrose agar (SDA; Difco Laboratories, species has revealed that most media used in our Detroit, USA) in 10 ml of brain heart infusion broth (BHI, experiments, such as nutrient broth (Difco Laboratories, Difco Laboratories) with 2% glucose in a 50 ml Erlenmeyer Y. Mikami (Corresponding author), A. Mukai, K. Yazawa: K. Harada: Faculty of Pharmacy, Meijo University, Tempaku, Research Center for Pathogenic Fungi and Microbial Toxicosis, Nagoya 468-8503, Japan Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba-city, Chiba U. Gräfe: Hans-Knoll-Institute for Natural Products Research 260-8673, Japan, E-mail: [email protected] (Deceased February 14, 2003) 357 OH N H 4 o ' /4c;::::~,.,;e,=) y::sl:topsis sp.) ,,, 0 H OH '· OH R: -OH cholic acid (1) :' -NH(CH2) 2S03H taurocholic acid (2) -NHCH COOH glycocholic acid (3) 2 5 0 0 OH 6 Fig. 1 Possible biotransformation routes of bile acids [cholic acid (1), taurocholic acid (2), and glycocholic acid (3)] by Nocardia otitidiscaviarum IFM 0988 and Amycolatopsis sp. IFM 0703. shake flask. The culture was incubated on a rotary shaker at silica gel using an elution solvent mixture of AcOEt/i- 250 rpm for 4 days. We transferred 10% of inoculum to a PrOH/H2O (4 : 2 : 1, upper phase). Compound 4 was 500 ml Erlenmeyer flask containing 150 ml of the obtained through further purification by preparative TLC production medium (two times concentrated nutrient broth using the same solvent system. From 2-liter cultures, 2 mg medium, Difco Laboratories) with 2% glycerol and 0.05% of compound 4 was obtained. antifoam. We adjusted the medium to pH 7.4; the culture The fraction containing sterol-type compounds from was incubated on a rotary shaker at 250 rpm for 6 days. Amycolatopsis sp. IFM 0703 strain was applied to Diaion After incubation, an equal volume of MeOH was added to HP-20 column (Mitsubishi Chemical Corp.) and washed the culture broth, which was then incubated for another 3 with distilled water and 50% aq. CH3OH. Elution with hours to kill the microorganisms. Cholic acid spots were CH3OH yielded a fraction containing cholic-acid related visualized on silica gel TLC plates by spraying a 5% compounds. This fraction was rechromatographed on a ϫ ethanolic solution of molybdophosphoric acid, followed by silica gel column (2.5 60 cm) with CHCl3/CH3OH/H2O heating at 120°C for 5 minutes. Thereafter, the broth was (65 : 15 : 5, lower phase). The fraction that included filtered and evaporated under vacuum to one-third of its compound 5 was further purified by gel filtration original volume. The filtrate was applied to a Diaion HP-20 chromatography (Toyopearl HW-40; TosoHaas) to yield column (3ϫ30 cm; Mitsubishi Chemical Corp.) and compound 5 (25.9 mg). The fraction including compound 6 washed with distilled water (100 ml). The fractions were was further rechromatographed on a silica gel column ϫ eluted with 100 ml of CH3OH and then evaporated to (1.5 40 cm) and eluted with AcOEt/i-PrOH/H2O (4 : 2 : 1, dryness. The cholic acid fractions were extracted with upper phase). It was then purified by gel filtration 50 ml of a 1 : 1 volume mixture of BuOH and water. Then chromatography to yield compound 6 (2.3 mg). the solvent layer was evaporated to dryness. The dried fractions were chromatographed on a silica gel column Detection of Bile Acids by LC/MS ϫ (3 30 cm) and eluted with acetone/CH3OH (7 : 1). Our preliminary studies suggested the presence of sterol- Subsequently, the fractions were rechromatographed on type compounds in the culture broths of N. otitidiscaviarum 358 121.08 2.784 l f\_ TIC 2.0e41 \ 1.0&4µ \ "83.35 \.~__,...--~ l ~~-----·"'--~33 ._/'·-..,.~,,,,,,.-........__...._~ .. 0.0! 2 .j 6 10 12 14 16 i's 20 22 24 26 28 Tme.min cholic acid 500) •= 400j 2001 l l :i 4 6 6 10 12 14 16 1·s 20 22 24 26 28 Time.min glycocholic acid 48:US 1000 500 I\ o" 2 4 6 8 10 12 14 16 18 20 22 24 2tl 28 Time.mil taurocholic acid 53333 .'\ 10001 ·1 i.J t 5001 ~: \ l 2 4 6 8 10 1·2 14 16 IS 20 22 24 2tl 28 Time. min Fig. 2 Detection by LC/MS of bile acids in the nutrient medium (Difco Laboratories). LC conditions for EIS-TOF LC/MS: ϫ column: TSK gel super ODS (100 2.0 mm i.d.), mobile phase; CH3OH/H2O containing 0.1% formic acid, gradient rate; → CH3OH 40 100% (30 minutes), linear, flow rate: 0.2 ml/minute, splitting ratio; 1/40. IFM 0988 and Amycolatopsis sp. IFM 0703. However, such Structure Elucidation sterol-type compounds have never been reported as Compound 4 was isolated from the culture broth of N. procaryotic metabolites in bacteria such as Nocardia and otitidiscaviarum IFM 0988 and compounds 5 and 6 were Amycolatopsis species. This information indicated that isolated from the culture broth of Amycolatopsis sp. IFM sterol-type compounds may exist in the nutrient broth 0703, when grown on media containing cholic acid (1), without inoculation of the bacterial culture, prompting us to taurocholic acid (2), and glycocholic acid (3) as trace seek and thereby detect sterol-type compounds in the non- constituents. Structures of compounds 4, 5 and 6 were inoculated nutrient broth. LC conditions for ESI-TOF elucidated by MS and 1D/2D NMR spectroscopy. The IR (electrospray-time of flight) LC/MS (API QSTAR Pulsar-I; spectrum of compound 4 (film, satellite FTIR; Mattson MDS Sciex) were the following: column; TSK gel super Instruments) showed absorbance at 2940 (C–H), and ϫ Ϫ1 ODS (100 2.0 mm, i.d.), mobile phase; CH3OH/H2O 3397 cm (OH). The HRESI-MS (95XL; Finnigan MAT containing 0.1% formic acid, gradient rate CH3OH GmbH) of compound 4 displayed the sodiated ion at m/z 40%→100% (30 minutes), linear, flow rate; 0.2 ml/minute, 474.32510 ([MϩNa]ϩ, calcd. 474.3195) suggesting splitting ratio, 1/40. Using this LC/MS detection method, C26H45NO5 as its chemical formula. Structures of three sterol-type compounds (1, 2 and 3) were detected compounds 5 and 6 were elucidated using FAB mass ϩ ϩ (cholic acid (1): 14.4 minutes, m/z 426 [M NH4] , spectrometry (JMS-700 MS-station; JEOL) and 1D/2D ϩ ϩ glycocholic acid (2): 13.3 minutes, m/z 483 [M NH4] , NMR spectroscopy. Positive ion FAB mass spectra showed and taurocholic acid (3): 10.1 minutes, m/z 533 the protonated molecule [MϩH]ϩ at m/z 403 for compound ϩ ϩ [M NH4] ) (Fig. 2). Their presence was also confirmed by 5 and at m/z 405 for compound 6. The molecular formulae comparison with authentic respective reference samples. of 5 and 6 were established to be C24H34O5 and C24H36O5 These data showed clearly that 1, 2 and 3 are included in on the basis of HR-FAB mass measurements (m/z 403.2496 the non-cultured nutrient medium such as nutrient broth [MϩH]ϩ Dϩ1.2 mmu) and (m/z 405.2621 [MϩH]ϩ (Difco Laboratories).
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