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Cloning of Critical Gene Fragments in Saikosaponin Biosynthesis and Associated Sequence Analysis
Author(s): 
Pages: 56-60,15
Year: Issue:  5
Journal: World Science and Technology-Modernization of Traditional Chinese Medicine

Keyword:  北柴胡柴胡皂苷3-羟基-3甲基戊二酰辅酶A还原酶(HMGR)异戊烯基焦磷酸异构酶(IPPI)法尼基焦磷酸合酶(FPS);
Abstract: 本文以北柴胡幼嫩根的总RNA为模板,通过RT-PCR方法,克隆出3-羟基-3甲基戊二酰辅酶A还原酶(3-hydroxy-3-methylglutaryl coenzyme A reduetase,HMGR)、异戊烯基焦磷酸异构酶(isopentenyl diphosphate isomerase,IPPI)和法尼基焦磷酸合酶(farnesyl diphosphate synthase,FPS)基因的cDNA片断,大小分别为470bp、532bp、466bp,分别编码157、177、155个氨基酸多肽.提交到Gen-Bank上,得到登陆号分别为:HMGR(EU400217)、IPPI(EU400218)、FPS(EU400219).NCBI在线blast结果表明,推断的北柴胡HMGR、IPPI和FPS基因的氨基酸序列分别与杜仲、三岛柴胡和雷公藤的一致性最高,分别为93%、99%、97%.对HMGR基因和FPS基因进行特征性保守域分析,结果显示,推断的HMGR氨基酸序列存在两个NADPH结合基序,FPS存在三个特征性保守序列:DDIMD、GQMID和KL.构建的植物IPPI的分子进化树表明,北柴胡IPPI基因与伞形科植物(胡萝卜和三岛柴胡)亲缘关系最近,与单子叶植物(玉米和水稻)亲缘关系较远.本文首次分离报道了北柴胡柴胡皂苷合成途径中三个关键酶基因(HMGR、IPPI和FPS)cDNA的克隆,新获得的基因片段序列为进一步克隆全序列和了解调控柴胡皂苷的生物合成奠定了基础.
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