中文摘要：

目的设计耐甲氧西林金黄色葡萄球菌(methicillin-resistant Staphylococcus aureus,MRSA)耐药相关TG-TPase嵌合基因,构建其真核表达质粒,为嵌合基因的高效、分泌型表达奠定基础。方法在序列结构分析的基础上,设计引物从MRSA菌株中扩增其耐药性相关转糖基酶(TGase)和转肽酶(TPase)活性片段,进一步用酶切连接等分子生物学操作构建TG-TPase嵌合基因,亚克隆至酵母表达质粒pPIC9K中,转化DH5α大肠埃希菌。经酶切、PCR和核苷酸测序鉴定正确的重组质粒用SalⅠ线性化,整合入甲醇营养型毕赤酵母GS115中,在DNA和基因转录水平鉴定出阳性重组酵母。结果采用PCR从MRSA基因组中扩增得到了873bp的TGase片段和1044bp的TPase片段。以酶切连接构建的TG-TPase嵌合基因经酶切、PCR鉴定,能获得约1900bp的融合片段,与预期结果相符,测序表明序列和阅读框均正确。线性化的重组质粒转化GS115后,得到5个高拷贝阳性转化子,经诱导表达和PCR鉴定,这些转化子能转录出目的基因的mRNA。结论成功构建了含TG-TPase嵌合基因的重组毕赤酵母工...

英文摘要：

Objective To design a drug-resistance related TG-TPase chimeric gene derived from methicillin-resistant Staphylococcus aureus(MRSA)and express the gene in Pichia pastoris.Methods The TGase domain of PBP2 and the TPase domain of PBP2a were amplified from MRSA DNA by PCR.The chimeric TG-TPase gene was constructed by processing standard genetic methods,and then cloned into the SnaB Ⅰ/Not Ⅰ sites of pPIC9K plasmid.After digestion by Sal Ⅰ,the linear pPIC9K-PBP2-2a was transformed into Pichia pastoris strain GS1...