摘要
目的从白木香Aquilaria sinensis总RNA中克隆倍半萜合成酶基因,并对其进行生物信息学及表达分析。方法对白木香总RNA进行反转录聚合酶链式反应(reverse transcription-PCR,RT-PCR)和cDNA末端快速扩增(rapid amplification of cDNA ends,RACE),获得完整的开放阅读框(ORF)。运用生物信息学的方法对该序列进行相似性比较和同源性分析,预测编码蛋白,并对其进行各种理化性质分析。通过半定量PCR检测该基因在白木香树干中不同部位的表达情况。结果获得As-SesTPS基因,ORF长1 629 bp,编码542个氨基酸,与葡萄Vitis vinifera的大根香叶烯-D合成酶[(-)-germacrene D synthas]相似性最高,且包含RRx8W和DDxxD的保守序列。As-SesTPS蛋白无跨膜区域,定位于细胞质中,且仅在白木香结香部位表达。结论首次从白木香中克隆得到可能编码大根香叶烯-D合成酶的基因,为白木香倍半萜生物合成代谢途径的研究提供参考。
Objective To clone the sesquiterpene synthase gene As-SesTPS from total RNA ofAquilaria sinensis and to analyze the bioinformatics and gene expression. Methods The gene containing intact open reading frame (ORF) was cloned by reverse transcription-PCR (RT-PCR) and rapid amplification of cDNA ends (RACE). The similarity comparison and honaology analysis of the sequence were carried out using bioinformatic method, the coding protein was predicted and the physicochemical: properties were analyzed. The expression of the gene in different locations of A. sinensis trunk was determined by semiquantitative PCR using gene-specific primers. Results The As-SesTPS gene, containing a 1 629 bp ORF that encoded 542 amino acids, was cloned. The deduced protein sequence had the most similarity to the (-)-germacrene-D synthase in Fitis vinifera and exhibited two conserved motifs (RRxsW and DDxxD). Without transmembrane domain, As-SesTPS was located in cytoplasm and expressed only in the agarwood part. Conclusion The As-SesTPS gene probably encoding (-)-germacrene-D synthase ofA. sinensis is successfully cloned for the first time, which would provide a reference for the study of sesquiterpene biosynthase pathway in A. sinensis.
出处
《中草药》
CAS
CSCD
北大核心
2014年第1期94-101,共8页
Chinese Traditional and Herbal Drugs
基金
国家自然科学基金资助项目(31100496
81102418)
广东省中国科学院全面战略合作项目(2011B090300078)
广东省科技计划项目(2012A030100014)
关键词
白木香
倍半萜合成酶
基因克隆
生物信息学
基因表达分析
Aquilaria sinensis (Lour.) Gilg
sesquiterpene synthase
gene cloning
bioinformatics
gene expression analysis