Sardisterol,A New Polyhydroxylated Sterol from the Soft Coral Sarcophyton digitatum Moser

A new polyhydroxylated sterol, named sardisterol, was isolated from the soft coral Sarcophyton digitatum Moser. Its structure was determined as (22R, 24ξ)‐methylcholest‐5‐en‐3β, 22, 25, 28‐tetraol‐3‐acetate on the basis of spectroscopic methods.     

Synthesis of endogenous sperm-activating and attracting factor isolated from ascidian Ciona intestinalis

A chemoattractant candidate named sperm-activating and attracting factor (SAAF) from the eggs of ascidian Ciona intestinalis, was synthesized from chenodeoxycholic acid in 16 steps. The present synthesis led to the unambiguous structure determination of SAAF to be (3R,4R,7R,25S)-3,4,7,26-tetrahydroxycholestane-3,26-disulfate. The synthetic pure specimen was also used to confirm the dual sperm-activating and attracting activity.     

海洋生物中具有生物活性的多羟基甾醇及甾体皂苷

综述了近几年来对海洋生物中具有生物活性的多羟基甾醇及其皂苷研究的新进 展，报道了以新化合物为主的80个具有生理活性化合物的结构，并部分地阐述了其 构效关系。     

南海海绵Axinyssa aplysinoides的化学成分研究(二)

从中国南海采集的海绵Axinyssaaplysinoides中分离得到一白色结晶 ,通过UV ,IR ,MS ,NMR等波谱方法和光谱技术 ,确定了它的结构为Δ2 2 (2 3 ) (E) - 2 4 ,2 6 ,2 6-三甲基 - 2 5(30 ) -亚甲基胆甾醇     

中国南海软珊瑚Cladiella similis化学成分的研究（Ⅱ）

本文报道应用波谱及GC－MS等方法从软珊瑚Cladiella similis中分离鉴定出柳珊瑚甾醇、麦角甾醇和鲨肝醇。     

小棒短指软珊瑚Sinularia microclavata中的生物活性氧化甾醇

从南中国海采集的小棒短指软珊瑚Sinularia microclavata Tix-Dur中首次分离得2个氧化甾醇. 通过各种近代波谱分析方法,鉴定出它们分别为孕甾-5-烯-3-醇-20-酮(pregnenolone)(1)和9,11-开环-24-亚甲基-5α-胆甾-7-烯-3β,6α,11-三羟基-9酮(2).1和2均有较强的细胞毒活性.     

新甾醇Echifloristerol的结构测定

从中国南海采集的花刺柳珊瑚中分离到一种新的甾醇echifloristerol。通过波谱方法,确定其结构为22-ξ-甲基-Δ~(5(6)).23(24))-胆甾烷-3β-醇。     

Sterols from the Fungus Catathelasma imperiale

Eight ergostane-type sterols and three their derivatives (one mono-linoleate and two mono-glucosides) were isolated from the ethyl acetate soluble fraction of the fungus Catathelasma imperi.a/e. Two of them are novel compounds, namely 22E,24R-er-gosta-7,22-diene-3β ,5α-diol-6β-linoleate (1) and 22E, 24R-er-gosta-7,22-diene-3β, 5β, 6α-triol (5) with an uncommon c/s-fused A/B ring. Structures of these compounds were demon-strated on the basis of their chemical evidences and spectroscop-ic methods, especially 2D NMR techniques.     

Molecular design of two sterol 14α-demethylase homology models and their interactions with the azole antifungals ketoconazole and bifonazole

Summary Sterol 14α-demethylase (CYP51) is one of the known major targets for azole antifungals. Therapeutic side effects of these antifungals are based on interactions of the azoles with the human analogue enzyme. This study describes for the first time a comparison of a human CYP51 (HU-CYP51) homology model with a homology model of the fungal CYP51 of Candida albicans (CA-CYP51). Both models are constructed by using the crystal structure of Mycobacterium tuberculosis MT-CYP51 (PDB code: 1EA1).The binding mode of the azole ketoconazole is investigated in molecular dynamics simulations with the GROMACS force field. The usage of special parameters for the iron azole complex binding is necessary to obtain the correct complex geometry in the active site of the enzyme models. Based on the dynamics simulations it is possible to explain the enantioselectivity of the human enzyme and also to predict the binding mode of the isomers of ketoconazole in the active site of the fungal model.     

扁缩滨珊瑚(Porites compressa Dana)化学成分的研究

利用柱层析和制备薄层色谱技术研究扁缩滨珊瑚(Porites compressa Dana)的化学成分，从中分离纯化得到2个化合物：a-十八碳烷醇甘油醚(鲨肝酵)(I)、N-1-羟基甲基-2-羟基-(E，E)-3，7-十七碳二烯基十六酸酰胺(Ⅱ)；同时经GC-MS鉴定6个甾醇：麦角甾烷酵、豆甾-22-烯-3β-醇、麦角甾-5-烯--3β酵、胆甾-5-烯-3β-醇、麦角甾-5，22-二烯-3β-醇和豆甾-5，22-二烯-3β-醇．