毛韧革菌中的韧革菌素类似物(英文)

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  Abstract: In order to study the secondary metabolites of Stereum hirsutum FP91666, four vibralactone derivatives were isolated from YMG fermentation broth products of this strain —— one new vibralactone derivative, vibralactone R(1), together with three known vibralactones (2-4) —— by the methods of silica gel chromatography, gel chromatography, and semipreparative HPLC and so on. The new structure was elucidated by spectroscopic data including HRESIMS experiments, 1D and 2D NMR.
  Key words: phytochemistry, vibralactone, structure identification, chemical constituents, NMR
  CLC number: Q946
  Document code: A
  Article ID: 10003142(2017)05061704
  摘要: 從毛韧革菌(Stereum hirsutum FP91666)的YMG发酵液中分离得到1个新的韧革菌素类似物——韧革菌素R(1)以及3个已知的类似物——韧革菌素(2-4)。利用硅胶色谱、凝胶色谱等方法,结合半制备型HPLC对该菌次生代谢产物进行研究得到这些化合物,并通过核磁共振(包括1DNMR、2DNMR)、高分辨质谱实验(HRESIMS)、紫外光谱等波谱学方法鉴定其结构。
  关键词: 植物化学, 韧革菌素, 结构鉴定, 化学成分, 核磁共振
  Stereum is basidiomycete fungus and belongs to Stereaceae family and can produce a variety of secondary metabolites (Nair et al, 1977; Dubin et al, 2000; Abraham 2001; Omolo et al, 2002). In the previous work (Duan et al, 2015), we used PDA medium to culture S. hirsutum FP91666 and obtained some compounds from the strain. On the basis of the genome data, S. hirsutum could yield further more secondary metabolites (Lackner et al, 2012). In process of studying the biosynthesis of vibralactone (Zhao et al, 2013), which generated from S. vibran and inhibited the pancreatic lipase with an IC50 value of 0.4 μg·mL1 (Liu et al, 2006), we had explored homologous genes of biosynthetic vibralactone, and learned that S. hirsutum can synthesize vibralactonetype compounds (Kim et al, 2009; Kim et al, 2010). In order to further explore its potential in production of new and active compounds, the OSMAC (one strain, many compounds) strategy was employed to mining the chemical diversity of this strain (Bode et al, 2002). And now one new vibralactone derivative, vibralactone R(1), together with three known vibralactones (2-4) were obtained from YMG fermentation broth products of S. hirsutum FP91666. The present work describes the isolation and structure of four vibralactones (Fig. 1).
  1Materials and Methods
  1.1 General
  UV spectra were measured using a Shimadzu UV2401 PC spectrophotometer (Shimadzu, Tokyo, Japan). NMR experiments were carried out on Bruker AM400 and Avance 600 NMR spectrometers with tetramethylsilane (TMS) as an internal standard. ESIMS and HRESIMS were recorded on a VG AutoSpec3000 mass spectrometer (VG, Manchester, England) and a Finnigan LCQAdvantage mass spectrometer (Thermo, San Jose, USA), respectively. Optical rotations were measured using a Jasco DIP370 digital polarimeter (JASCO, Tokyo, Japan). Column chromatography was carried out on silica gel (G, 200-300 mesh and GF254) (Qingdao Marine Chemical Factory, Qingdao, China) and Sephadex LH20 (Pharmacia). Precoated silica gel GF254 plates (Qingdao Marine Chemical Factory, Qingdao, China) were used for thin layer chromatography (TLC). Some fractions were purified by LC3000 Semipreparation Gradient HPLC (Beijing Chuangxintongheng Science & Technology Co., Ltd, Beijing, China).   1.2 Fungal material
  S. hirsutum FP91666 was preserved in 20% glycerol at -80 ℃ in State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany. The strain was inoculated into 500 mL Erlenmeyer flasks, which contained 200 mL YMG broth (yeast extract 4.0 g·L1, malt extract 10.0 g·L1, glucose 4.0 g·L1, pH 7.3 before sterilization). After incubation at 26 ℃ for 7 d on a rotary shaker (180 r·min1), each primary culture was transferred into a 500 mL Erlenmeyer flask containing 250 mL the same broth and incubated at 26 ℃ for 21 d on a rotary shaker (180 r·min1).
  1.3 Extraction and isolation
  The extract of nButanol (10.51 g) of the culture broth (15 L) was separated on a column (silica gel G, 200-300 mesh, 150 g) and eluted with a petroleum ether (PE)EtOAc (10∶1 to 6∶4) and CHCl3MeOH (10∶1 to 0∶100) gradient solvent system to yield nine fractions (Fr. 1-Fr. 9). Fr. 2 (0.86 g) was subjected on a column (silica gel G, 200-300 mesh, 60 g) using a PEacetone (100∶4→0∶100) solvent system to produce six subfractions (Fr. 2.1-Fr. 2.6). Fr. 2.2 was subjected on Sephadex LH20 (MeOH) column and then purified by LC3000 Semipreparation Gradient HPLC (RPC18, 250 mm×10 mm, 5 μm, 210 nm, MeOHH2O from 50∶50 to 95∶5, a flow rate of 3.0 mL·min1) to yield 1 (5.6 mg) and 3 (4.2 mg). Fr. 2.3 was chromatographed on GF254 column using PEacetone (100∶4→0∶100) and then purified by Sephadex LH20 (MeOH) to produce 4 (2.1 mg). Fr. 3 (0.65 g) was subjected to a column (silica gel G, 200-300 mesh, 50 g) using a PEEtOAc (100∶4→0∶100) solvent system to produce seven subfractions (Fr. 3.1-Fr. 3.7). Fr. 3.1 was separated on a column (silica gel G, 200-300 mesh, 10 g) using CHCl3MeOH (100∶0→10∶1) and then purified by Sephadex LH20 (MeOH) column to yield 2 (5.2 mg).
  2Results
  2.1 Vibralactone R (1)
  Colorless oil; [α]= -6.8 (c = 1.3, MeOH); UV (MeOH) λmax (log ε): 202 (3.44); ESIMS: m/z 207 [M + Na]+; HRESIMS m/z: 207.099 4 [M + Na]+(calc. 207.099 7).
  Compound 1 was achieved as colorless oil. The HRESIMS data revealed a molecular formula of C10H16O3
  based on the [M + Na]+ ion signal at m/z 207.099 4 (calc. 207.099 7). The MS and NMR spectroscopic data of Compound 1 were substantially the same with those of vibralactone G (3) except that the chemical shifts of CH2-10 (δH 4.02, δC 68.3) and CH3-11 (δH 1.68, δC 13.9) were changed in Compound 1 (Wang et al, 2012). The 2DNMR data revealed that the H8 (δH 5.42) of methine correlated with the carbons at δC 68.3 (C10), 39.5 (C3), 28.4 (C7) and 13.9 (C11); H10 (δH 4.02) of methylene correlated with the carbons at δC 138.0 (C9), 120.9 (C8) and 13.9 (C11); H11 (δH 1.68) of methylene correlated with the carbons at δC 138.0 (C9), 120.9 (C8) 68.3 (C10) and 39.5 (C2). The NOESY experiment (Fig. 2) showed NOE correlations between H8 and H10; H5 and H4b; H4a and H3a, supporting the relative configurations. Based on the above data, Compound 1 was determinated to be as shown in Fig. 1, and named as vibralactone R.   In addition, the three vibralactones D (2), G (3) and O (4) (Fig. 1) were identified by comparison of
  the MS and NMR data obtained with those reported in the literature (Wang et al, 2012; Chen et al, 2014).
  2.2 Vibralactone D (2)
  Colorless crystal; [α]= +17.4 (c = 0.8, MeOH); UV (MeOH) λmax (log ε): 202.5 (3.64); 1HNMR (CD3OD, 600 MHz) δ: 1.67 (1H, ddd, J1= 2.0, J2 = 5.2, J3 = 12.4 Hz, H2β), 1.80 (1H, dd, J1= 2.5, J2 = 12.4 Hz, H2α), 2.26 (1H, m, H3), 1.47 (1H, ddd, J1= 2.7, J2 = 4.6, J3 = 14.0 Hz, H4α), 2.40 (1H, m, H4β), 3.95 (1H, dd, J1= 4.6, J2 = 10.3 Hz, H5), 2.08 (1H, dd, J1= 8.2, J2 = 14.3 Hz, H8β), 2.60 (1H, dd, J1 = 6.7, J2 = 14.3 Hz, H8α), 5.06 (1H, m, H9), 1.56 (1H, s, H11), 1.61 (1H, s, H12), 4.08 (1H, brd, J = 9.1 Hz, H13a), 4.25 (1H, ddd, J1 = 1.0, J2 = 2.6, J3 = 10.2 Hz, H13b); 13CNMR (CD3OD, 150 MHz) δ: 58.3 (C1), 34.8 (C2), 34.3 (C3), 38.8 (C4), 79.3 (C5), 175.6 (C7), 31.9 (C8), 121.4 (C9), 135.5 (C10), 18.2 (C11), 26.3 (C12), 78.7 (C13); ESIMS: m/z 233 [M + Na]+; HRESIMS m/z: 233.1151 [M + Na]+(calc. 233.1154).
  2.3 Vibralactone G (3)
  Colorless oil;ESIME: m/z 207 [M + Na]+; 1HNMR and 13CNMR see Table 1.
  2.4 Vibralactone O (4)
  Colorless oil; ESIMS:m/z 213 [M+H]+; 1HNMR (CDCl3, 600 MHz) δ: 2.05 (1H, overlap, H2), 2.26 (1H, m, H3), 1.23 (1H, m, H4), 2.16 (1H, overlap, H4), 2.15 (1H, overlap, H5), 3.95(1H, m, H6), 3.56 (1H, m,H6), 3.80 (1H, m, H7), 3.45 (1H, m, H7), 2.04 (1H, overlap, H8), 2.40 (1H, m), 5.00 (1H, t, J = 6.5 Hz, H9), 1.57 (3H, s, H11), 1.63 (3H, s, H12); 13CNMR (CDCl3, 150 MHz) δ: 219.1 (s, C1), 57.8 (d, C2), 43.2 (d, C3), 30.1 (t, C4), 50.0 (d, C5), 62.5 (t, C6 ), 66.6 (t, C7 ), 28.5 (t, C8), 121.0 (d, C9), 134.4 (s, C10), 18.2 (q, C11), 26.0 (q, C12).
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