1. 毕业设计(论文)的内容和要求
课题简介人参中含有人参多糖和多种人参皂苷等主要活性成分,其中以稀有人参皂苷的研究最为引人注目,特异性的糖基化修饰赋予了稀有人参皂苷极高而又独特的药理活性,但稀有人参皂苷天然含量极低,难以大量获得。
本研究旨在对微生物来源的糖基转移酶UGTBL1进行结构分析,通过分子对接、定点突变等手段挖掘并改造活性位点的关键氨基酸,提高糖基转移酶催化原人参三醇的效率和糖基化区域选择性,从而实现稀有人参皂苷Rh1的高效定向合成。
论文要求 1. 文献检索及阅读掌握文献查阅的方法,使用网络资源如中国期刊网、维普数据库、超星数字图书馆、Elsevier 电子期刊、Springer Link 全文电子期刊等检索资源,查阅关于应用于人参皂苷的糖基转移酶研究现状,糖基转移酶改造方面的相关文献。
2. 参考文献
[1] Tita Ritsema, Jeanine Joling Sjef Smeekens. Patterns of fructan synthesized by onion fructan:fructan 6G-fructosyltransferase expressed in tobacco BY2 cells is fructan: fructan 1-fructosyltransferase needed in onion [J].New Phytologist, 2003, 160: 61-67[2] 杨金玲, 高丽丽, 朱平. 人参皂苷生物合成研究进展[J]. 药学学报, 2013(2):170-178.[3] Jia L, Zhao Y. Current evaluation of the millennium phytomedicine-ginseng (I): Etymology, pharmaco-gnosy, phytochemistry, market and regulations [J]. Curr Med Chem, 2009, 16(19): 2475-2484.[4] 梁会超, 王庆华, 巩婷, et al. 人参皂苷生物合成相关糖基转移酶研究基本策略及进展[J]. 药学学报, 2015(2):148-153.[5] 陈利平,韩亚伟,毛多斌,等.枯草芽胞杆菌果糖基转移酶基因的克隆及其序列分析[J].河南农业大学学报,2009,4(43):432-436[6] 张南生, 张秀华, 李文峰. 人参皂苷Rg3的研究进展[J]. 医药导报, 2006, 25(7):687-689. [7] Rare ginsenoside Ia synthesized from F1 by cloning and overexpression of the UDP-glycosyltransferase gene fromBacillus subtilis: synthesis, characterization, andin vitromelanogenesis inhibition activity in BL6B16 cells[J]. Journal of Ginseng Research, 2018, 42(1):42-49.[8] Quan L H, Min J W, Jin Y, et al. Enzymatic biotransformation of ginsenoside Rb1 to 20 (S)-Rg3 by recombinant β-glucosidase from Microbacterium esteraromaticum [J]. Appl Microbiol Biotechnol, 2012, 94(2): 377-384.[9] Keegstra K, Raikhel N. Plant glycosyltransferases. Current opinion in plant biology, 2001,4(3):219~224.6 Coutinho PM, Deleury E, Davies GJ, et al. An evolving hierarchical family classification for glycosyltransferases. Journal of molecular biology,2003, 328(2):307~317.[10] Zhao L G, Xie J C, Zhang X S, et al. Over expression and characterization of a glucose-tolerant-glucosidase from Thermotoga thermarum DSM 5069T with high catalytic efficiency of ginsenoside Rb1 to Rd [J]. J Mole Cataly B: Enzym, 2013, 95: 62-69.
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