GUO Si-yuan,YIN Yan,SHI Ying-hui,et al.Cloning and Prokaryotic Expression of Glycosyltransferase Genes from Paris polyphylla var. yunnanensis[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(08):126-134.
GUO Si-yuan,YIN Yan,SHI Ying-hui,et al.Cloning and Prokaryotic Expression of Glycosyltransferase Genes from Paris polyphylla var. yunnanensis[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(08):126-134. DOI: 10.13422/j.cnki.syfjx.20210411.
Cloning and Prokaryotic Expression of Glycosyltransferase Genes from Paris polyphylla var. yunnanensis
To clone the full-length glycosyltransferase genes (
PpUGT
1,
PpUGT
7) related to saponins biosynthesis in
Paris polyphylla
var.
yunnanensis
,and perform bioinformatics analysis,relative expression analysis and prokaryotic expression analysis.
Method
2
Total RNA was isolated from
P. polyphylla
var.
yunnanensis
with use of the Eastep
®
Super Total RNA Extraction Kit and converted to cDNA. Specific primers were designed according to the transcriptome data to clone the full-length gene. Relevant software was then used for bioinformatic analysis of the protein sequences. The relative gene expression levels were detected by real-time fluorescent quantitative polymerase chain reaction (Real-time PCR) and the prokaryotic expression vectors were built to heterologously express recombinant protein in
Escherichia coli.
Result
2
The open reading frame (ORF) of
PpUGT
1 was 1 827 bp,encoding 608 amino acids,and was predicted as a steroid glycosyltransferase;the ORF of
PpUGT
7 was 1 380 bp,encoding 459 amino acids,and was predicted as a triterpenoid glycosyltransferase. The calculated relative molecular mass of two proteins were 67.6 kDa and 51.3 kDa respectively,and both of them were hydrophilic proteins,no transmembrane domain,no signal peptides,both showing high similarity and conservativeness with homologous sequences. The results of Real-time PCR showed that the expression level of
PpUGT
1 was root
>
leaf
>
flower
>
stem;the expression level of
PpUGT
7 was stem
>
leaf
>
flower
>
root. In addition,PpUGTs proteins were expressed in
E. coli
. in a soluble form.
Conclusion
2
The genes of
PpUGT
1 and
PpUGT
7 were cloned successfully. Real-time PCR showed the genes were expressed differently in different plant organs, and their recombinant proteins were successfully expressed in
Escherichia coli
. This study lays a foundation for functional characterization of PpUGTs and analysis of the biosynthesis pathway of saponins in
Paris polyphylla
var.
yunnanensis
.
关键词
Keywords
references
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