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1.湖南中医药大学 研究生院,长沙 410208
2.湖南省中医药研究院 中药资源研究所,长沙 410013
Received:15 August 2022,
Published Online:29 November 2022,
Published:20 February 2023
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刘晓柳,谢珍妮,钟灿等.茯苓鲨烯环氧酶基因克隆与表达分析[J].中国实验方剂学杂志,2023,29(04):144-152.
LIU Xiaoliu,XIE Zhenni,ZHONG Can,et al.Cloning and Expression Analysis of Squalene Epoxidase Gene in Poria cocos[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(04):144-152.
刘晓柳,谢珍妮,钟灿等.茯苓鲨烯环氧酶基因克隆与表达分析[J].中国实验方剂学杂志,2023,29(04):144-152. DOI: 10.13422/j.cnki.syfjx.20230111.
LIU Xiaoliu,XIE Zhenni,ZHONG Can,et al.Cloning and Expression Analysis of Squalene Epoxidase Gene in Poria cocos[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(04):144-152. DOI: 10.13422/j.cnki.syfjx.20230111.
目的
2
从茯苓中克隆参与茯苓三萜合成路径中的潜在关键限速酶鲨烯环氧酶(SE),并对其进行生物信息学及表达分析。
方法
2
采用试剂盒提取总RNA,反转录为cDNA,设计特异性引物,以cDNA为模板,进行
SE
基因的克隆,对该基因进行生物信息学分析。通过实时荧光定量聚合酶链式反应(Real-time PCR)检查茯苓鲨烯环氧酶基因(
PcSE
)在茯苓神舟10号、湘靖28、5.78菌株中的表达。
结果
2
PcSE
的基因全长为1 571 bp,包含4个外显子,3个内含子。获得编码区域(CDS)序列长为1 413 bp,编码470个氨基酸。该蛋白为疏水性蛋白,无信号肽,有2个跨膜结构域,具有FAD/NAD(P)结合域和鲨烯环氧酶结构域,定位于线粒体或质膜上。与多孔菌科真菌的同源序列比对一致性为80.92%;系统进化树显示PcSE蛋白与美国茯苓的亲缘关系最近。Real-time PCR结果显示,
PcSE
基因在3个菌株中均有表达,在5.78菌株中的表达量最高,3个菌株的
PcSE
表达差异不存在统计学意义。
结论
2
首次从茯苓中克隆并分析茯苓
PcSE
基因,为进一步研究茯苓
PcSE
的功能及解析茯苓三萜生物合成途径提供了基础。
Objective
2
To clone squalene epoxidase (SE), a potential key rate-limiting enzyme involved in the synthesis pathway of
Poria cocos
triterpenes, from
P. cocos
and analyze for bioinformatics and expression.
Method
2
The total RNA was extracted by the kit and reverse-transcribed to cDNA. Specific primers were designed, and the cDNA was used as a template for cloning the
SE
gene, which was analyzed for bioinformatics. The expression of
P. cocos
qualene epoxidase(
PcSE
) was examined by Real-time polymerase chain reaction(Real-time PCR) in
P. coco
Shenzhou No. 10, Xiangjing 28, and 5.78 strains.
Result
2
The full length of
PcSE
is
1 571 bp, containing four exons and three introns. The obtained CDS sequence is 1 413 bp, encoding 470 amino acids. This protein is a hydrophobic protein with no signal peptide structure and has two transmembrane structural domains with a FAD/NAD (P) binding domain and SE structural domain localized to the mitochondrial membrane and the plasma membrane. The homologous sequence alignment with fungi of the Poriferae family is 80.92%, and the phylogenetic tree shows that
PcSE
protein is most closely related to
P. cocos
from the US. The results of Real-time PCR showed that the
PcSE
was expressed in all three strains, with the highest expression in 5.78 strain, and there was no significant difference in
PcSE
expression among the three strains.
Conclusion
2
For the first time, the
PcSE
gene was cloned and analyzed from
P. cocos,
providing a basis for further research on the function of
PcSE
and the analysis of
P. cocos
triterpene biosynthesis pathway.
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