Identification and characterization of Japanese encephalitis virus envelope protein gene from swine.
OBJECTIVE
Identification and characterization of Japanese encephalitis virus (JEV) envelope protein gene from swine.


RESULTS
Genomic RNA was separated from JEV isolated strain Henan-09-03, and used as templates for cDNA synthesis of E gene. The cDNA of E gene was amplified by RT-PCR and cloned into the pMD19-T-Vector and confirmed by sequencing. The cloned gene was then subcloned into the pET-32a and was introduced into Escherichia coli BL21 (DE3) for expression. The E protein was purified by Ni chelating column-based affinity chromatography. The molecular weight of expressed protein was about 50 kDa. Compared with the published sequence of SA14 (AF495589), the homology of the nucleotide sequence was 98% and the seven mutations resulting in amino acid substitutions at Leu 36 Ser, Leu107 Val, Ala167 Thr, Asn 230 Ser, Leu 340 Pro, Asn 430 Ile, Phe 448 Leu. Phylogenetic analysis of the E sequence of isolated strain classified it within genotype III of the JEV. The result of Western blotting indicated that the antigenicity of the protein was specific.


CONCLUSIONS
The stable expression of the protein and the analysis of its antigenic specificity provide the foundation for developing the ELISA early stage diagnosis kit.


CONCLUSIONS
As coating antigen, the recombinant E protein served a good source in the indirect ELISA method for the detection of JEV antibody.
Fan
J-M
JM
Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, China.
Luo
J
J
Zhang
G-P
GP
Chen
L
L
Teng
M
M
Yang
M-F
MF
Wang
L
L
Wang
C-Q
CQ
D019943:Amino Acid Substitution / Q000235:genetics; D000818:Animals; D015153:Blotting, Western; D002846:Chromatography, Affinity; D003001:Cloning, Molecular; D016000:Cluster Analysis; D004664:Encephalitis Virus, Japanese / Q000235:genetics* / Q000276:immunology / Q000302:isolation & purification*; D004926:Escherichia coli / Q000235:genetics; D015870:Gene Expression; D006801:Humans; D008970:Molecular Weight; D010802:Phylogeny; D012367:RNA, Viral / Q000235:genetics / Q000302:isolation & purification; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012689:Sequence Homology, Nucleic Acid; D013552:Swine / Q000821:virology*; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000235:genetics* / Q000276:immunology / Q000302:isolation & purification
D012367:RNA, Viral; D011994:Recombinant Proteins; D014759:Viral Envelope Proteins