本研究旨在構建表達載體pET-30a-VjbR，進而表達布魯氏菌VjbR蛋白；利用生物軟件分析該蛋白生物信息學信息，為進一步研究該蛋白奠定基礎。以布魯氏菌Rev.1株基因組為模板，擴增VjbR基因序列，將其克隆至原核表達載體pET-30a（+）中，獲得重組質(zhì)粒pET-30a-VjbR，并進行原核表達、Western-blot檢測及該基因的生物信息學分析。結果顯示：本試驗成功克隆并表達了VjbR基因；經(jīng)對表達產(chǎn)物進行SDS-PAGE分析純化，發(fā)現(xiàn)本試驗得到較純蛋白；經(jīng)Western-blot檢測，發(fā)現(xiàn)該基因表達蛋白可與布魯氏菌羊陽性血清發(fā)生特異性反應，具有良好的反應原性；通過生物信息學系列軟件統(tǒng)計分析，發(fā)現(xiàn)VjbR蛋白無跨膜區(qū)，無信號肽，且該蛋白共有15個抗原決定簇，在二級結構中，α-螺旋的氨基酸有131個，占比為49.81%。布魯氏菌VjbR基因的成功表達與純化，為進一步制備該蛋白的單克隆抗體及iELISA診斷試劑盒的研制奠定了基礎。
Cloning，Prokaryotic Expression and Bioinformatics Analysis of VjbR Gene of Brucella melitensis Rev.1 Strain
In order to construct the expression vector（pET-30a-VjbR）to express the VjbR protein of Brucella，and to analyze the bioinformatics information of the protein by biological software so as to lay a foundation for further relevant study. Taking the genome of Brucella melitensis Rev.1 strain as a template，VjbR gene sequence was amplified and then cloned into the prokaryotic expression vector，pET-30a（+），to obtain the recombinant plasmid，pET-30a-VjbR，then the prokaryotic expression，western-blot and bioinformatics analysis were respectively carried out. The results showed that VjbR gene was successfully cloned and expressed；the purer protein was received after SDS-PAGE analysis and purification for the expressed products；it was detected that the expressed protein could specially react with the positive sheep serum through western-blot，showing good reactivity；according to the analysis by series of bioinformatics software，it was found that VjbR protein was with no any transmembrane domain or signal peptide，it had 15 antigenic determinants. In the secondary structure，the number of α-spiral amino acids was 13，accounting for 49.81%. In conclusion，the successful expression and purification of VjbR gene of Brucella would lay a foundation for further preparation of monoclonal antibodies and development of iELISA kit.
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