常氧条件下同时表达突变型低氧诱导因子1α目的蛋白和人源化绿色荧光蛋白报告分子腺病毒真核表达载体的构建

背景:低氧诱导因子1能够调控多种基因共同表达,在骨缺损部位可诱导生理功能完整的新血管生成.目的:构建能够同时表达突变型低氧诱导因子1α(hypoxia inducible factor 1 alpha,HIF-1α)目的蛋白和人源化绿色荧光蛋白(human renilla reniformis green fluorescent protein,hrGFP)报告分子的新型腺病毒真核细胞表达载体.方法:对目的基因供体质粒pCMV6-XL5-HIF1α携带的人低氧诱导因子1α基因进行测序和对其序列内部限制性内酶识别位点进行分析,利用PCR(poly-merase chain reaction,PCR)技术定点突变低氧诱导因子1α基因编码区的第402位、564位和803位氨基酸,酶切、测序检测突变情况,将正确突变后的低氧诱导因子1α基因(突变mutagenesis,突变后的HIF-1α基因写作HIF-1αmu)定向连入腺病毒穿梭载体pShuttle-CMV-IRES-hrGFP-1中.携带HIF-1αmu基因的重组腺病毒穿梭载体经测序鉴定、Pme I酶切线性化后转化BJ5183-AD-1电感受态细胞,利用细菌内同源重组机制将HIF-1αmu和人源化绿色荧光蛋白基因连同其顺势表达元件重组入腺病毒基因组质粒,通过Pac I酶切及测序鉴定获得重组体.结果与结论:经基因测序证实,HIF-1α基因编码区的第402位、564位和803位氨基酸均定点突变成丙氨酸.经酶切鉴定及测序证实,重组腺病毒表达载体构建成功.结果表明,成功构建了新型重组腺病毒突变型真核细胞表达载体pAd-HIF1αmu-IRES-hrGFP-1.

Construction of adenovirus-mediated eukaryotic expression vector co-expressing mutant hypoxia-inducible factor-1 alpha target protein and humanized Renilla reniformis green fluorescent protein reporter molecule under normoxic conditions

BACKGROUND: Hypoxia-inducible factor-1 (HIF-1) can regulate the co-expression of various genes, and can induce angiogenesis with integrated physiological function.OBJECTIVE: To construct a novel adenoviral eukaryotic expression vector that can co-express mutant hypoxia-inducible factor-1 alpha (HIF-1a) target protein and humanized Renilla reniformis green fluorescent protein (hrGFP) reporter molecule under normoxic conditions.METHODS: The human HIF-1α gene carried by target gene donor plasmid pCMV6-XL5-HIF1α was sequenced and the site of restriction enzyme in above gene was analyzed. Site-directed mutagenesis of three amino acids including the 402 location, the 564 location, and the 803 location in gene coding region in HIF-1α were performed by polymerase chain reaction and sequencing was also done for monitoring mutation. The HIF-1α gene mutated correctly (HIF-1αmu) was coupled to adenoviral shuttle vector pShuttle-CMV-IRES- hrGFP-1. The recombinant adenovirus shuttle vector carrying HIF-1αmu gene was transferred to BJ5183-AD-1 electroporation competent cells after sequencing identification and Pme I restriction enzyme linearization.HIF-1αmu and hrGFP gene as well as hemeo-expression elements of hrGFP gene were reconstructed into adenoviral genome plasmids using homologous recombination mechanism in bacterium. Recombinants were obtained by Pac I restriction enzyme digestion and sequencing identification.RESULTS AND CONCLUSION: Amino acids including the 402 location, the 564 location and the 803 location in gene coding region in HIF-1α had become alanine after site-directed mutagenesis. Recombinant adenoviral expressing vector was successful as confirmed by restriction enzyme digestion and sequencing. These findings demonstrate that a novel recombinant adenoviral mutant eukaryotic expression vector pAd-HIF1αmu-IRES-hrGFP-1 was successfully constructed.