[Cloning and sequence analysis on cDNA of squalene epoxidase gene in Eleutherococcus senticosus].
OBJECTIVE
To clone and sequence the cDNA of squalene epoxidase gene in Eleutherococcus senticosus.


METHODS
Total RNA of E. senticosus was extracted by the improved isothiocyanate method and reverse transcripted into cDNA. The primers were designed depending on the reported SE cDNA sequences of Panax ginseng. The SE cDNAs in E. senticosus was amplified using RT-PCR strategy.


RESULTS
Sequencing results showed two different cDNA fragments (SE1, SE2) with 1665, 1629 bp each ORF which encoded 554,542 amino acids, respectively. The identities of nucleotides and amino acids between SE1, SE2 were 91.49%, 92.55%. SE1, SE2 had the highest amino acids similarity to the SE1 of P. notoginseng, 93.45%, 94.87% respectively. SE1, SE2 both had a FAD binding domain. The deduced speculated amino acids of SE1, SE2 each had 2,4 membrane-spanning helices.


CONCLUSIONS
The two SE sequences in E. senticosus were firstly separated and reported, which has made foundation for E. senticosus secondary metabolite engineering researches.
College of Life Science, Hebei United University, Tangshan 063000, China. xing-zhaobin@yahoo.com.cn
Zhaobin
Z
Xing
Lei
L
Cao
Long
L
Chen
Shan
S
He
Baocai
B
Li
Jinli
J
Zhu
D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics*; D028001:Eleutherococcus / Q000201:enzymology / Q000235:genetics*; D007527:Isoenzymes / Q000145:classification / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D050603:Squalene Monooxygenase / Q000145:classification / Q000235:genetics*
D018076:DNA, Complementary; D007527:Isoenzymes; D010940:Plant Proteins; D050603:Squalene Monooxygenase