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1.河南中医药大学 药学院,郑州 450046;
2.河南中医药大学 呼吸疾病诊疗与新药研发河南省协同创新中心,郑州 450046
刘雅琳,硕士,讲师,从事药物分析与复方研究,E-mail:liuyalin_1984@163.com
赵乐,博士,副教授,从事药用植物分子生物学研究,E-mail:zhaole1983@126.com
收稿日期:2019-05-02,
网络出版日期:2019-07-19,
纸质出版日期:2019-11-05
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刘雅琳, 朱畇昊, 盛芷葳, 等. 垂序商陆
Ya-lin LIU, Yun-hao ZHU, Zhi-wei SHENG, et al. Cloning and Expression Analysis of PaAACT Gene from Phytolacca americana[J]. Chinese journal of experimental traditional medical formulae, 2019, 25(21): 124-131.
刘雅琳, 朱畇昊, 盛芷葳, 等. 垂序商陆
Ya-lin LIU, Yun-hao ZHU, Zhi-wei SHENG, et al. Cloning and Expression Analysis of PaAACT Gene from Phytolacca americana[J]. Chinese journal of experimental traditional medical formulae, 2019, 25(21): 124-131. DOI: 10.13422/j.cnki.syfjx.20192113.
目的:
2
从垂序商陆根中克隆了商陆皂苷甲生物合成过程中关键酶乙酰乙酰辅酶A转移酶(acetoacetyl-CoA transferase,AACT)基因,进行生物信息学分析和原核表达。
方法:
2
提取垂序商陆根的总RNA,然后逆转录合成cDNA,在分析垂序商陆转录组数据的基础上,设计
PaAACT
基因的特异性引物,聚合酶链式反应(PCR)扩增
PaAACT
基因的cDNA序列,通过构建原核表达载体pET-32a-PaAACT,诱导表达并且纯化目的蛋白。
结果:
2
PaAACT
基因开放阅读框为1 254 bp,编码417个氨基酸。生物信息学分析显示PaAACT蛋白的分子式为C
1 914
H
3 120
N
538
O
576
S
17
,推测其相对分子质量为43.43 kDa,理论等电点8.90,不稳定系数32.27,属于稳定蛋白质。根据生物信息学分析结果,PaAACT蛋白属于硫解酶家族成员,在C末端含有硫解酶家族的1个保守位点和1个活性位点。PaAACT蛋白可能位于细胞质中、不含信号肽、没有跨膜区。系统进化分析显示PaAACT蛋白与甜菜等廖科植物AACT蛋白亲缘关系较近。经IPTG诱导,在大肠埃希菌BL21(DE3)菌株中表达了PaAACT重组蛋白,利用Ni
2+
亲和色谱获得了纯化的目的蛋白。
结论:
2
该研究从垂序商陆中克隆
PaAACT
基因,为下一步测定PaAACT酶催化活性、制备抗体奠定基础,也为研究其在商陆皂苷甲生物合成途径中的作用提供理论依据。
Objective:
2
To clone the key enzyme gene involved in the biosynthesis of esculentoside A(EsA)
acetoacetyl-CoA transferase(AACT) gene was cloned from
Phytolacca americana
for bioinformatics analysis and prokaryotic expression.
Method:
2
Total RNA was extracted from the root of
P
.
americana
and then cDNA was synthesized through the reverse transcription. Based on analysis of the transcriptome data of
P
.
americana
the specific primers of
PaAACT
gene were designed
and the cDNA sequence of
PaAACT
gene was amplified by polymerase chain reaction(PCR) method. Prokaryotic induction
expression and purification of the target protein were induced through the construction of the prokaryotic expression vector pET-32a-PaAACT.
Result:
2
The open reading frame (ORF) of
PaAACT
gene was 1 254 bp
and encoded 417 amino acid residues. Bioinformatic analysis showed that the molecular formula of PaAACT protein was C
1 914
H
3 120
N
538
O
576
S
17
inferring that its molecular weight was 43.43 kDa
the theoretical isoelectric point was 8.90
and the instability index of PaAACT protein was 32.27
which was a stable protein. According to bioinformatics analysis
PaAACT protein was a member of the thiolase family and contained one conserved site and one active site of the thiolase family at the C-terminal. PaAACT protein may be located in the cytoplasm
without a signal peptide or transmembrane domain. The phylogenetic analysis indicated that PaAACT protein showed the highest homology with AACT protein from polygonaceae plants (such as
Beta vulgaris
). The recombinant PaAACT protein was successfully expressed in
Escherichia coli
BL21(DE3) strain through IPTG induction
and the purified target protein was obtained by Ni
2+
affinity chromatography.
Conclusion:
2
In this study
the
PaAACT
gene was cloned from
P
.
americana
which lays a foundation for further determination of enzyme activity assay of PaAACT and preparation of antibody
and provides the theoretical basis for studying its role in the biosynthesis pathway of EsA.
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