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机构地区:[1]山东大学微生物技术国家重点实验室
出 处:《山东大学学报(自然科学版)》1998年第2期228-235,共8页Journal of Shandong University(Natural Science Edition)
摘 要:氧化硫硫杆菌重组质粒pSDT125在RP4质粒的带动下以高出pBR325两个数量级的频率在大肠杆菌之间转移.转移后,RP4和pSDT125以分离的形式共存于接合转移子中.该质粒不能被SM10菌株染色体上的tra基因带动转移.以pSDT125质粒为基础,通过亚克隆构建了两个质粒pSDT1250,pSDT1251.二者可以被RP4质粒带动在大肠杆菌之间转移,转移频率与pSDT125相近,没有明显降低.还构建了含有氧化硫硫杆菌质粒pTt12片段的穿梭质粒pSDM211,可以被RP4带动在大肠杆菌与氧化硫硫杆菌之间转移.通过限制性内切酶分析,初步将pTt12的复制原点确定在3.0kb的片段内.おオ玊hiobacillus thiooxidans recombinant plasmid pSDT125 containing pTt12 can be mobilized between E.coli strains by plasmid RP4 and its mobilization frenquency was 100 times higher than that of pBR325.After mobilization,RP4 and pSDT125 coexist in the conjugants by seperating form.The faliure of pSDT125 to be mobilized by tra gene located on the chromosome of SM10 strain showed nonexistance of mob gene on pTt12.Its subclones,pSDT1250,pSDT1251,were constructed by deletion of different fragment of pTt12.Both of them can be mobilized by RP4 between Ecoli strains without obvious reduction in mobilization frequency in contrast to pSDT125.A shuttle plasmid pSDM211 with a fragment of Thiobacillus thiooxidans plasmid pTt12 was constructed.It can be mobilized between E.coli and T.thiooxidans by RP4.The origin of replication of pTt12 was shown to be contained on a 3.0kb fragment of DNA by restruction endonuclease analysis.
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