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新型强效免疫抑制剂西罗莫司的微生物转化
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摘要
西罗莫司(Sirolimus, SRL)是由吸水链霉菌产生的36元环含氮三烯大环内酯具有很强的抗真菌、抗增殖和抗肿瘤作用的新型强效免疫抑制剂。由于它的多功能作用及其应用价值,西罗莫司结构改造已成为人们的研究热点。通过化学半合成法已获得一些新的mTOR酶抑制剂如RAD001、CCI-779和AP23573,已被开发为防治血管再狭窄的涂层支架药物、被开发为毒副作用极低的靶向抗肿瘤药物。除化学半合成外,人们还尝试利用微生物或微生物产生的酶对西罗莫司进行结构改造的另一条途径,企图通过微生物转化方法来获取新化合物。本研究应用不同类型的66株微生物对西罗莫司进行微生物转化试验,获得15株能转化西罗莫司的小单孢菌和1株游动放线菌。我们选取了生物转化率较高的小单孢菌FIM03-712作为代表菌株进行了深入的研究。菌种分类研究表明它与旱地小单孢菌Micromonospora chersina类似。研究了小单孢菌FIM03-712对西罗莫司的生物转化条件并从转化发酵液中分离、纯化出微生物转化产物FJ900。理化性质和LC-MS,NMR等波谱分析研究表明FJ900与14-去氧雷帕霉素同质。它的抗真菌和免疫抑制活性比西罗莫司低,它的潜在抗肿瘤作用将有待于进一步研究。
Sirolimus produced by Streptomyces hygroscopicus FC904 is a 36-membered macrolide immunosuppressant with antifungal, antiproliferative and antitumor activity. The structural modification of sirolimus has attracted great interest for its multifunctional effect and applied value. Several novel mTOR inhibitors such as RAD001, CCI-779 and AP23573 made by chemical synthesis have been used as coating for vascular stents to prevent restenosis of coronary arteries and are being developed into anticancer targeting drugs. Besides the chemical synthesis, microbial conversion is performed as an another approach for searching novel analogs of sirolimus. In this paper, it showed that different types of 66 culture were screened for the biotransformation of sirolimus and 15 strains of Micromonospora and 1 strain of Actinoplanes were found to be capable of transforming sirolimus. Micromonospora sp. FIM03-712 as a candidate was selected and classified as Micromonospora chersina. The conversion conditions of sirolimus by Micromonospora sp. FIM03-712 were explored. One conversion product, FJ900, from the broth of the strain was isolated and purified. By means of physico-chemical properties and spectral analyses such as HPLC, UV, IR, LC-MS and NMR, FJ900 was turned out to be identical with 14-deoxorapamycin. In comparation with sirolimus, FJ900 had less activity in antifungal and immunosuppressive actions. Whereas, the anticancer activity will be investigated further.
引文
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